PKG / Packaging Corporation of America - SEC-arkiveringar, Årsredovisning, Fullmaktsutlåtande

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 31, 2025 Packaging Corporati

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 31, 2025 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

PACKAGING CORPORATION OF AMERICA OFFICERS’ CERTIFICATE August 15, 2025

EX-4.1 Exhibit 4.1 PACKAGING CORPORATION OF AMERICA OFFICERS’ CERTIFICATE August 15, 2025 Pursuant to the authority granted by the Board of Directors of Packaging Corporation of America (the “Company”) in its Resolutions of the Board of Directors of the Company, dated June 26, 2025, and pursuant to Section 301 of the Indenture, dated as of July 21, 2003 (the “Indenture”), between the Company and U

PACKAGING CORPORATION OF AMERICA $500,000,000 5.200% SENIOR NOTES DUE 2035 UNDERWRITING AGREEMENT

EX-1.1 Exhibit 1.1 PACKAGING CORPORATION OF AMERICA $500,000,000 5.200% SENIOR NOTES DUE 2035 UNDERWRITING AGREEMENT August 11, 2025 BofA Securities, Inc. Mizuho Securities USA LLC U.S. Bancorp Investments, Inc. As Representatives of the Several Underwriters c/o BofA Securities, Inc. One Bryant Park New York, New York 10036 c/o Mizuho Securities USA LLC 1271 Avenue of the Americas New York, New Yo

PACKAGING CORPORATION OF AMERICA 5.200% SENIOR NOTES DUE 2035

EX-4.2 Exhibit 4.2 THIS NOTE IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITORY OR A NOMINEE THEREOF. THIS NOTE IS EXCHANGEABLE FOR NOTES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITORY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE AND, UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 11, 2025 Packaging Corporati

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 11, 2025 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

$500,000,000 Packaging Corporation of America 5.200% Senior Notes due 2035

424B5 Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-289469 PROSPECTUS SUPPLEMENT (To Prospectus dated August 11, 2025) $500,000,000 Packaging Corporation of America 5.200% Senior Notes due 2035 We are offering $500,000,000 aggregate principal amount of our 5.200% senior notes due 2035, which we refer to as the “notes.” The notes will pay interest semi-annually in arrears

Security Type

Calculation of Filing Fee Tables S-3 PACKAGING CORP OF AMERICA Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Debt 5.

SUBJECT TO COMPLETION, DATED AUGUST 11, 2025

424B3 Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-289469 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities, and we are not soliciting an offer to buy these securities, in any jurisdiction where the offer or sale is

Packaging Corporation of America $500,000,000 5.200% Senior Notes due 2035 Pricing Term Sheet August 11, 2025 Issuer: Packaging Corporation of America Title of Securities: 5.200% Senior Notes due 2035 Aggregate Principal Amount: $500,000,000 Pricing

FWP Filed pursuant to Rule 433 Dated August 11, 2025 Relating to Preliminary Prospectus Supplement dated August 11, 2025 to Prospectus dated August 11, 2025 Registration Statement No.

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE

EX-25.1 Exhibit 25.1 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ Check if an Application to Determine Eligibility of a Trustee Pursuant to Section 305(b)(2) U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (Exact name of Trustee as specified in its charter) 91-1821036

As filed with the Securities and Exchange Commission on August 11, 2025

S-3ASR Table of Contents As filed with the Securities and Exchange Commission on August 11, 2025 Registration No.

POWER OF ATTORNEY

EX-24.1 Exhibit 24.1 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS that each person whose signature appears below constitutes and appoints Mark W. Kowlzan, Kent A. Pflederer and S. Ellis Cunningham, and each of them, his or her true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all

Security Type

Calculation of Filing Fee Tables S-3 PACKAGING CORP OF AMERICA Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Debt Debt Securities 457(r) 0.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Registran

Credit Agreement, dated July 31, 2025 between Packaging Corporation of America, the lenders named therein, Bank of America, N.A., as administrative agent, BofA Securities, Inc., Mizuho Bank, Ltd. and U.S. Bank National Association as joint lead arrangers and bookrunners and Mizuho Bank, Ltd. and U.S. Bank National Association, as co-syndication agents.

EX-10.1 Exhibit 10.1 CERTAIN INFORMATION, MARKED IN THIS EXHIBIT WITH [***], HAS BEEN EXCLUDED FROM THIS EXHIBIT IN RELIANCE ON REGULATION S-K, ITEM 601(B)(10)(IV) BECAUSE SUCH INFORMATION IS BOTH NOT MATERIAL AND IS THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. EXECUTION VERSION Published CUSIP Numbers: Deal: 695157AX5 Revolver: 695157AY3 Term Loan: 695157AZ0 CREDIT AGREEMENT Da

Credit Agreement, dated July 31, 2025 between Packaging Corporation of America, the lenders named therein, CoBank, ACB, as administrative agent and syndication agent and CoBank, ACB, Compeer Financial, PCA and BofA Securities Inc. as joint lead arrangers and bookrunners.

EX-10.2 Exhibit 10.2 CERTAIN INFORMATION, MARKED IN THIS EXHIBIT WITH [***], HAS BEEN EXCLUDED FROM THIS EXHIBIT IN RELIANCE ON REGULATION S-K, ITEM 601(B)(10)(IV) BECAUSE SUCH INFORMATION IS BOTH NOT MATERIAL AND IS THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. CREDIT AGREEMENT Dated as of July 31, 2025 among PACKAGING CORPORATION OF AMERICA as Borrower and THE INITIAL LENDERS N

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 31, 2025 Packaging Corporation

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 31, 2025 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

PACKAGING CORPORATION OF AMERICA REPORTS SECOND QUARTER 2025 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS SECOND QUARTER 2025 RESULTS Lake Forest, IL, July 23, 2025 – Packaging Corporation of America (NYSE: PKG) today reported second quarter 2025 net income of $242 million, or $2.67 per share, and net income of $224 million, or $2.48 per share, excluding special items. Second quarter net sales were $2.2 billion in 2025 and $2.1 billion in 2024. Dil

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 23, 2025 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 30, 2025 Packaging Corporation

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 30, 2025 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

Purchase and Sale Agreement, dated June 30, 2025, among Packaging Corporation of America, Greif, Inc. and Greif Packaging LLC.

Exhibit 10.1 PURCHASE AND SALE AGREEMENT among GREIF PACKAGING LLC, PACKAGING CORPORATION OF AMERICA and GREIF, INC. (solely with respect to the purposes set forth herein) Dated as of June 30, 2025 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS SECTION 1.01 Certain Defined Terms 1 SECTION 1.02 Definitions 16 SECTION 1.03 Interpretation and Rules of Construction. 17 ARTICLE II PURCHASE AND SALE SECTI

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 1, 2025 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

Certain statements in this presentation are forward-looking statements. Forward-looking statements include statements about our future financial condition, expected benefits from the acquisition, the timing of completion of the acquisition, our expec

Packaging Corporation of America Acquisition of Greif Containerboard Business July 1, 2025 Exhibit 99.

PACKAGING CORPORATION OF AMERICA ANNOUNCES AGREEMENT TO PURCHASE GREIF CONTAINERBOARD BUSINESS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA ANNOUNCES AGREEMENT TO PURCHASE GREIF CONTAINERBOARD BUSINESS Lake Forest, IL, July 1, 2025 – Packaging Corporation of America (NYSE: PKG) today announced that it has entered into a definitive agreement to purchase the containerboard business of Greif, Inc. for $1.8 billion in cash. The transaction is expected to close by the end of PCA’s third quarter

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 A. Full title of the plan and

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 A. Full title of the plan and

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 7, 2025 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Registra

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 22, 2025 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer

PACKAGING CORPORATION OF AMERICA REPORTS FIRST QUARTER 2025 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS FIRST QUARTER 2025 RESULTS Lake Forest, IL, April 22, 2025 – Packaging Corporation of America (NYSE: PKG) today reported first quarter 2025 net income of $204 million, or $2.26 per share, and net income of $208 million, or $2.31 per share, excluding special items. First quarter net sales were $2.1 billion in 2025 and $2.0 billion in 2024. Dilut

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the registrant  ☒         Filed by a party other than the registrant  ☐ Check the appropriate box: ☐ Preliminary proxy statemen

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the registrant  ☒        Filed by a party other than the registrant  ☐ Check the appropriate box: ☐ Preliminary proxy statement ☐ Confide

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 26, 2025 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

PACKAGING CORPORATION OF AMERICA ANNOUNCES PLANNED MANAGEMENT CHANGES

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA ANNOUNCES PLANNED MANAGEMENT CHANGES Lake Forest IL February 26, 2025 – Packaging Corporation of America (NYSE:PKG) announced today the following planned management changes. Robert P. Mundy, PCA’s Executive Vice President and Chief Financial Officer, will step down as CFO on May 1, 2025 and remain employed by PCA in an advisory role through his planned

Packaging Corporation of America Insider Trading Policy adopted December 7, 2011 with Addendum applicable to certain designated persons. †

Exhibit 19.1 PACKAGING CORPORATION OF AMERICA INSIDER TRADING POLICY December 7, 2011 This policy applies to all directors, officers, employees, consultants and contractors of Packaging Corporation of America and its subsidiaries (the “Company”), as well as their immediate family members sharing their household. This policy is designed to prevent insider trading or allegations of insider trading a

Powers of Attorney.†

Exhibit 24.1 SPECIAL POWER OF ATTORNEY The undersigned constitutes and appoints Mark W. Kowlzan, Robert P. Mundy and Kent A. Pflederer, and each of them, his true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him and in his name, place, and stead, in any and all capacities, to sign the Annual Report on Form 10-K for the fiscal year ended December 31,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission file number 1-15399 (Exact Name of Registrant as Sp

Subsidiaries of the Registrant.†

Exhibit 21.1 Subsidiaries of the Registrant * State or Other Jurisdiction of Incorporation or Organization Packaging Corporation of America (100%) Delaware PCA International Inc. (100%) Delaware PCA International Services, LLC (100%) Delaware PCA Hydro Inc. (100%) Delaware Packaging Corporation of Asia, Limited (100%) Hong Kong PCA Central California Corrugated, LLC (100%) Delaware PCA Michigan Ac

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 28, 2025 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employ

PACKAGING CORPORATION OF AMERICA REPORTS FOURTH QUARTER AND FULL YEAR 2024 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS FOURTH QUARTER AND FULL YEAR 2024 RESULTS Lake Forest, IL, January 28, 2025 – Packaging Corporation of America (NYSE: PKG) today reported fourth quarter 2024 net income of $221 million, or $2.45 per share, and net income of $222 million, or $2.47 per share, excluding special items. Fourth quarter net sales were $2.1 billion in 2024 and $1.9 bil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Regi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 22, 2024 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employ

PACKAGING CORPORATION OF AMERICA REPORTS THIRD QUARTER 2024 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS THIRD QUARTER 2024 RESULTS Lake Forest, IL, October 22, 2024 – Packaging Corporation of America (NYSE: PKG) today reported third quarter 2024 net income of $238 million, or $2.64 per share, and net income of $239 million, or $2.65 per share, excluding special items. Third quarter net sales were $2.2 billion in 2024 and $1.9 billion in 2023. Dil

PKG / Packaging Corporation of America / STATE STREET CORP Passive Investment

SC 13G/A 1 PackagingCorpofAmerica.htm SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* PACKAGING CORP OF AMERICA (Name of Issuer) COMMON STOCK (Title of Class of Securities) 695156109 (CUSIP Number) September 30, 2024 (Date of Event Which Requires Filing of This Statement) Check the appropriate box to designate the r

October 15, 2024

October 15, 2024 Division of Corporation Finance United States Securities and Exchange Commission 100 F Street, N.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Registran

PACKAGING CORPORATION OF AMERICA REPORTS SECOND QUARTER 2024 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS SECOND QUARTER 2024 RESULTS Lake Forest, IL, July 23, 2024 – Packaging Corporation of America (NYSE: PKG) today reported second quarter 2024 net income of $199 million, or $2.21 per share, and net income of $199 million, or $2.20 per share, excluding special items. Second quarter net sales were $2.1 billion in 2024 and $2.0 billion in 2023. Dil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 23, 2024 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from       to       Commission file number 1-15399

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from       to       Commission file number 1-15399 A. Full title of

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 8, 2024 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Registra

As filed with the Securities and Exchange Commission on May 8, 2024

As filed with the Securities and Exchange Commission on May 8, 2024 Registration No.

Filing Fee Table (filed herewith).

Exhibit 107 CALCULATION OF FILING FEE TABLE Form S-8 (Form Type) PACKAGING CORPORATION OF AMERICA (Exact name of Registrant as Specified in its Charter) Table 1 – Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered(1) Proposed Maximum Offering Price Per Unit(2) Maximum Aggregate Offering Price(2) Fee Rate Amount of Registration Fee Equity Common Stock, $0.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 22, 2024 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer

PACKAGING CORPORATION OF AMERICA REPORTS FIRST QUARTER 2024 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS FIRST QUARTER 2024 RESULTS Lake Forest, IL, April 22, 2024 – Packaging Corporation of America (NYSE: PKG) today reported first quarter 2024 net income of $147 million, or $1.63 per share, and net income of $155 million, or $1.72 per share, excluding special items. First quarter net sales were $2.0 billion in 2024 and 2023. Diluted earnings per

SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the registrant  ☒        Filed by a party other than the registrant  ☐ Check the appropriate box: ☐ Preliminary proxy statement ☐ Confidential, f

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the registrant  ☒         Filed by a party other than the registrant  ☐ Check the appropriate box: ☐ Preliminary proxy statemen

Packaging Corporation of America Clawback Policy, adopted as of December 1, 2023.†

Exhibit 97 Clawback Policy December 1, 2023 Packaging Corporation of America Clawback Policy The Board of Directors (the “Board”) of Packaging Corporation of America (the “Company”) believes that it is in the best interests of the Company and its shareholders to adopt this Clawback Policy (the “Policy”), which provides for the recovery of certain incentive compensation in the event of an Accounting Restatement (as defined below).

Powers of Attorney.†

Exhibit 24.1 SPECIAL POWER OF ATTORNEY The undersigned constitutes and appoints Mark W. Kowlzan, Robert P. Mundy and Kent A. Pflederer, and each of them, his true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him and in his name, place, and stead, in any and all capacities, to sign the Annual Report on Form 10-K for the fiscal year ended December 31,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission file number 1-15399 (Exact Name of Registrant as Sp

Subsidiaries of the Registrant.†

Exhibit 21.1 Subsidiaries of the Registrant * State or Other Jurisdiction of Incorporation or Organization Packaging Corporation of America (100%) Delaware PCA International Inc. (100%) Delaware PCA International Services, LLC (100%) Delaware PCA Hydro Inc. (100%) Delaware Packaging Corporation of Asia, Limited (100%) Hong Kong PCA Central California Corrugated, LLC (100%) Delaware PCA Michigan Ac

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 28, 2024 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

Certain statements in this presentation are forward-looking statements. Forward-looking statements include statements about our future financial condition, our industry and our business strategy. Statements that contain words such as “anticipate”, “b

Packaging Corporation of America Bank of America Global Agriculture & Materials Conference February 29, 2024 Robert P.

PKG / Packaging Corporation of America / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv0107-packagingcorpofameric.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 12)* Name of issuer: Packaging Corp of America Title of Class of Securities: Common Stock CUSIP Number: 695156109 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 24, 2024 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employ

PACKAGING CORPORATION OF AMERICA REPORTS FOURTH QUARTER AND FULL YEAR 2023 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS FOURTH QUARTER AND FULL YEAR 2023 RESULTS Lake Forest, IL, January 24, 2024 – Packaging Corporation of America (NYSE: PKG) today reported fourth quarter 2023 net income of $189 million, or $2.10 per share, and net income of $192 million, or $2.13 per share, excluding special items. Fourth quarter net sales were $1.94 billion in 2023 and $1.98 b

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 27, 2023 PACKAGING CORPORATION OF AMERICA (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (C

5.700% Senior Notes due 2033 (Incorporated herein by reference to Exhibit 4.2 to PCA's Current Report on Form 8-K filed November 30, 2023, File No. 1-15399).

Exhibit 4.2 THIS NOTE IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITORY OR A NOMINEE THEREOF. THIS NOTE IS EXCHANGEABLE FOR NOTES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITORY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE AND, UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PAR

Officers’ Certificate, dated November 30, 2023, pursuant to Section 301 of the Indenture, dated as of July 21, 2003, between Packaging Corporation of America and U.S. Bank Trust Company, National Association, as successor in interest to U.S. Bank National Association

Exhibit 4.1 PACKAGING CORPORATION OF AMERICA OFFICERS’ CERTIFICATE November 30, 2023 Pursuant to the authority granted by the Board of Directors of Packaging Corporation of America (the “Company”) in its Resolutions of the Board of Directors of the Company, dated November 17, 2023, and pursuant to Section 301 of the Indenture, dated as of July 21, 2003 (the “Indenture”), between the Company and U.

Underwriting Agreement, dated November 27, 2023

Exhibit 1.1 PACKAGING CORPORATION OF AMERICA $400,000,000 5.700% SENIOR NOTES DUE 2033 UNDERWRITING AGREEMENT November 27, 2023 Deutsche Bank Securities Inc. Wells Fargo Securities, LLC As Representatives of the Several Underwriters c/o Deutsche Bank Securities Inc. 1 Columbus Circle New York, New York 10019 c/o Wells Fargo Securities, LLC 550 South Tryon Street, 5th Floor Charlotte, North Carolin

Calculation of Filing Fee Table (Form Type) Packaging Corporation of America (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

Exhibit 107 Calculation of Filing Fee Table 424(b)(5) (Form Type) Packaging Corporation of America (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Fees to Be Paid Debt 5.

$400,000,000 Packaging Corporation of America $400,000,000 5.700% Senior Notes due 2033

424B5 Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-259350 Prospectus supplement to prospectus dated September 7, 2021 $400,000,000 Packaging Corporation of America $400,000,000 5.700% Senior Notes due 2033 We are offering $400,000,000 aggregate principal amount of our 5.700% senior notes due 2033, which we refer to as the “notes.” The notes will pay interest semi-annuall

Packaging Corporation of America $400,000,000 5.700% Senior Notes due 2033 Pricing Term Sheet November 27, 2023 Issuer: Packaging Corporation of America Title of Securities: 5.700% Senior Notes due 2033 Aggregate Principal Amount: $400,000,000 Pricin

Filed pursuant to Rule 433 Dated November 27, 2023 Relating to Preliminary Prospectus Supplement dated November 27, 2023 to Prospectus dated September 7, 2021 Registration Statement No.

Subject to Completion, Dated November 27, 2023

Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-259350 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities, and we are not soliciting an offer to buy these securities, in any jurisdiction where the offer or sale is not pe

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Regi

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 23, 2023 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employ

PACKAGING CORPORATION OF AMERICA REPORTS THIRD QUARTER 2023 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS THIRD QUARTER 2023 RESULTS Lake Forest, IL, October 23, 2023 – Packaging Corporation of America (NYSE: PKG) today reported third quarter 2023 net income of $183 million, or $2.03 per share, and net income of $185 million, or $2.05 per share, excluding special items. Third quarter net sales were $1.9 billion in 2023 and $2.1 billion in 2022. Dil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Registran

First Amendment to Credit Agreement, dated April 27, 2023, between Packaging Corporation of America and the lenders and agents named therein. (Incorporated herein by reference to Exhibit 10.1 to PCA’s Quarterly Report on Form 10-Q for the period ended June 30, 2023, File No. 1-15399).

Exhibit 10.1 Execution Version FIRST AMENDMENT TO CREDIT AGREEMENT This FIRST AMENDMENT TO CREDIT AGREEMENT (this “Amendment”) dated as of April 27, 2023, is entered into by and among Packaging Corporation of America, a Delaware corporation (the “Borrower”), the Subsidiary Guarantors party hereto, the Lenders party hereto and Mizuho Bank, Ltd., as Swing Line Lender and administrative agent (in suc

PACKAGING CORPORATION OF AMERICA REPORTS SECOND QUARTER 2023 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS SECOND QUARTER 2023 RESULTS Lake Forest, IL, July 24, 2023 – Packaging Corporation of America (NYSE: PKG) today reported second quarter 2023 net income of $203 million, or $2.24 per share, and net income of $209 million, or $2.31 per share, excluding special items. Second quarter net sales were $2.0 billion in 2023 and $2.2 billion in 2022. Dil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 24, 2023 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

11-K Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

11-K 1 d413186d11k.htm 11-K Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission fil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 2, 2023 Packaging Corporation o

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 2, 2023 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Registra

PACKAGING CORPORATION OF AMERICA REPORTS FIRST QUARTER 2023 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS FIRST QUARTER 2023 RESULTS Lake Forest, IL, April 24, 2023 – Packaging Corporation of America (NYSE: PKG) today reported first quarter 2023 net income of $190 million, or $2.11 per share, and net income of $198 million, or $2.20 per share, excluding special items. First quarter net sales were $2.0 billion in 2023 and $2.1 billion in 2022. Dilut

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 24, 2023 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the registrant ☒ Filed by a party other than the registrant ☐ Check the appropriate box: ☐ Preliminary proxy statement ☐ Confidential, fo

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the registrant ☒ Filed by a party other than the registrant ☐ Check the appropriate box: ☐ Preliminary proxy statement ☐ Confid

Packaging Corporation of America Supplemental Executive Retirement Plan, as Amended and Restated Effective as of January 1, 2023.*†

Exhibit 10.4 PACKAGING CORPORATION OF AMERICA SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN (As Amended and Restated Effective as of February 27, 2019) PACKAGING CORPORATION OF AMERICA SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN (As Amended and Restated Effective as of February 27, 2019) INTRODUCTION The Packaging Corporation of America Supplemental Executive Retirement Plan was originally established Novembe

Powers of Attorney.†

Exhibit 24.1 SPECIAL POWER OF ATTORNEY The undersigned constitutes and appoints Mark W. Kowlzan, Robert P. Mundy and Kent A. Pflederer, and each of them, his true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him and in his name, place, and stead, in any and all capacities, to sign the Annual Report on Form 10-K for the fiscal year ended December 31,

Subsidiaries of the Registrant.†

Exhibit 21.1 Subsidiaries of the Registrant * State or Other Jurisdiction of Incorporation or Organization Packaging Corporation of America (100%) Delaware Polywoven Distributors PA, LLC (51%) Pennsylvania PCA International Inc. (100%) Delaware PCA International Services, LLC (100%) Delaware PCA Hydro Inc. (100%) Delaware Packaging Corporation of Asia, Limited (100%) Hong Kong PCA Texas Acquisitio

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission file number 1-15399 (Exact Name of Registrant as Sp

PKG / Packaging Corp. of America / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv0098-packagingcorpofameric.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 11)* Name of issuer: Packaging Corp. of America Title of Class of Securities: Common Stock CUSIP Number: 695156109 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate bo

PACKAGING CORPORATION OF AMERICA REPORTS FOURTH QUARTER AND FULL YEAR 2022 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS FOURTH QUARTER AND FULL YEAR 2022 RESULTS Lake Forest, IL, January 25, 2023 – Packaging Corporation of America (NYSE: PKG) today reported fourth quarter 2022 net income of $212 million, or $2.31 per share, and net income of $215 million, or $2.35 per share, excluding special items. Fourth quarter net sales were $1.98 billion in 2022 and $2.04 b

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 25, 2023 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employ

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Regi

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 24, 2022 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employ

PACKAGING CORPORATION OF AMERICA REPORTS THIRD QUARTER 2022 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS THIRD QUARTER 2022 RESULTS Lake Forest, IL, October 24, 2022 ? Packaging Corporation of America (NYSE: PKG) today reported third quarter 2022 net income of $262 million, or $2.80 per share, and net income of $266 million, or $2.83 per share, excluding special items. Third quarter net sales were $2.1 billion in 2022 and $2.0 billion in 2021. Dil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Registran

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 25, 2022 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer

PACKAGING CORPORATION OF AMERICA REPORTS SECOND QUARTER 2022 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS SECOND QUARTER 2022 RESULTS Lake Forest, IL, July 25, 2022 ? Packaging Corporation of America (NYSE: PKG) today reported second quarter 2022 net income of $301 million, or $3.20 per share, and net income of $304 million, or $3.23 per share, excluding special items. Second quarter net sales were $2.2 billion in 2022 and $1.9 billion in 2021. Dil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

11-K 1 d313896d11k.htm 11-K Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 or ☐ TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission fil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) ? ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 A. Full tit

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 17, 2022 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Registra

PACKAGING CORPORATION OF AMERICA REPORTS FIRST QUARTER 2022 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS FIRST QUARTER 2022 RESULTS Lake Forest, IL, April 25, 2022 ? Packaging Corporation of America (NYSE: PKG) today reported first quarter 2022 net income of $254 million, or $2.70 per share, and net income of $256 million, or $2.72 per share, excluding special items. First quarter net sales were $2.1 billion in 2022 and $1.8 billion in 2021. Dilut

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 25, 2022 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the registrant ? Filed by a party other than the registrant ? Check the appropriate box: ? Preliminary proxy statement ? Confidential, for use of

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the registrant ? Filed by a party other than the registrant ? Check the appropriate box: ? Preliminary proxy statement ? Confidential, for use of

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 21, 2022 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission file number 1-15399 (Exact Name of Registrant as Sp

Powers of Attorney.†

Exhibit 24.1 SPECIAL POWER OF ATTORNEY The undersigned constitutes and appoints Mark W. Kowlzan, Robert P. Mundy and Kent A. Pflederer, and each of them, his true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him and in his name, place, and stead, in any and all capacities, to sign the Annual Report on Form 10-K for the fiscal year ended December 31,

Subsidiaries of the Registrant.†

Exhibit 21.1 Subsidiaries of the Registrant * State or Other Jurisdiction of Incorporation or Organization Packaging Corporation of America (100%) Delaware Polywoven Distributors PA, LLC (51%) Pennsylvania PCA International Inc. (100%) Delaware PCA International Services, LLC (100%) Delaware PCA Hydro Inc. (100%) Delaware Packaging Corporation of Asia, Limited (100%) Hong Kong PCA Texas Acquisitio

PKG / Packaging Corp. of America / Capital World Investors - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* Packaging Corp. of America (Name of Issuer) Common Stock (Title of Class of Securities) 695156109 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which

PKG / Packaging Corp. of America / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 10)* Name of issuer: Packaging Corp. of America Title of Class of Securities: Common Stock CUSIP Number: 695156109 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule is

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 26, 2022 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employ

PACKAGING CORPORATION OF AMERICA REPORTS FOURTH QUARTER AND FULL YEAR 2021 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS FOURTH QUARTER AND FULL YEAR 2021 RESULTS Lake Forest, IL, January 26, 2022 ? Packaging Corporation of America (NYSE: PKG) today reported fourth quarter 2021 net income of $217 million, or $2.28 per share, and net income of $262 million, or $2.76 per share, excluding special items. Fourth quarter net sales were $2.0 billion in 2021 and $1.7 bil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Regi

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 25, 2021 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employ

PACKAGING CORPORATION OF AMERICA REPORTS THIRD QUARTER 2021 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS THIRD QUARTER 2021 RESULTS Lake Forest, IL, October 25, 2021 ? Packaging Corporation of America (NYSE: PKG) today reported third quarter 2021 net income of $251 million, or $2.63 per share, and net income of $257 million, or $2.69 per share, excluding special items. Third quarter net sales were $2.0 billion in 2021 and $1.7 billion in 2020. Dil

Officers’ Certificate, dated September 21, 2021, pursuant to Section 301 of the Indenture, dated as of July 21, 2003, between Packaging Corporation of America and U.S. Bank National Association (form of Notes filed under Exhibit 4.2 hereto)

Exhibit 4.1 PACKAGING CORPORATION OF AMERICA OFFICERS? CERTIFICATE September 21, 2021 Pursuant to the authority granted by the Board of Directors of Packaging Corporation of America (the ?Company?) in its Resolutions of the Board of Directors of the Company, dated September 3, 2021, and pursuant to Section 301 of the Indenture, dated as of July 21, 2003 (the ?Indenture?), between the Company and U

Underwriting Agreement, dated September 7, 2021

Exhibit 1.1 PACKAGING CORPORATION OF AMERICA $700,000,000 3.050% SENIOR NOTES DUE 2051 UNDERWRITING AGREEMENT September 7, 2021 Deutsche Bank Securities Inc. Wells Fargo Securities, LLC As Representatives of the Several Underwriters c/o Deutsche Bank Securities Inc. 60 Wall Street, 4th Floor New York, New York 10005 c/o Wells Fargo Securities, LLC 550 South Tryon Street, 5th Floor Charlotte, North

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 7, 2021 PACKAGING CORPORATION OF AMERICA (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (C

Form of 3.050% Senior Notes due 2051

Exhibit 4.2 THIS NOTE IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITORY OR A NOMINEE THEREOF. THIS NOTE IS EXCHANGEABLE FOR NOTES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITORY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE AND, UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PAR

CALCULATION OF REGISTRATION FEE Title of Securities to be registered(1) Amount to be Registered Maximum Offering Price Per Unit Maximum Aggregate Offering Price Amount of Registration Fee(1) 3.050% Senior Notes due 2051 $700,000,000 99.473% $696,311,

Table of Contents CALCULATION OF REGISTRATION FEE Title of Securities to be registered(1) Amount to be Registered Maximum Offering Price Per Unit Maximum Aggregate Offering Price Amount of Registration Fee(1) 3.

Subject to Completion, Dated September 7, 2021

Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-259350 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities, and we are not soliciting an offer to buy these securities, in any jurisdiction where the offer or sale is not pe

As filed with the Securities and Exchange Commission on September 7, 2021

As filed with the Securities and Exchange Commission on September 7, 2021 Registration No.

Packaging Corporation of America $700,000,000 3.050% Senior Notes due 2051 Pricing Term Sheet September 7, 2021 Issuer: Packaging Corporation of America Title of Securities: 3.050% Senior Notes due 2051 Aggregate Principal Amount: $700,000,000 Pricin

Filed pursuant to Rule 433 Dated September 7, 2021 Relating to Preliminary Prospectus Supplement dated September 7, 2021 to Prospectus dated September 7, 2021 Registration Statement No.

Powers of attorney (filed herewith)

Exhibit 24.1 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS that each person whose signature appears below constitutes and appoints Mark W. Kowlzan, Robert P. Mundy and Kent A. Pflederer, and each of them, his or her true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities,

Form T-1 Statement of Eligibility Under the Trust Indenture Act of 1939, as amended, of U.S. Bank National Association, as trustee (filed herewith)

Exhibit 25.1 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ? Check if an Application to Determine Eligibility of a Trustee Pursuant to Section 305(b)(2) U.S. BANK NATIONAL ASSOCIATION (Exact name of Trustee as specified in its charter) 31-0841368 I.R.S. Employer Identif

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Registran

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 26, 2021 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer

PACKAGING CORPORATION OF AMERICA REPORTS SECOND QUARTER 2021 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS SECOND QUARTER 2021 RESULTS Lake Forest, IL, July 26, 2021 ? Packaging Corporation of America (NYSE: PKG) today reported second quarter 2021 net income of $207 million, or $2.17 per share, and net income of $207 million, or $2.17 per share, excluding special items. Second quarter net sales were $1.9 billion in 2021 and $1.5 billion in 2020. Dil

Credit Agreement, dated June 8, 2021 between Packaging Corporation of America and the lenders and agents named therein

Exhibit 10.1 EXECUTION VERSION Published CUSIP Numbers: Deal: 695157AV9 Revolver: 695157AW7 CREDIT AGREEMENT Dated as of June 8, 2021 among PACKAGING CORPORATION OF AMERICA as Borrower and THE INITIAL LENDERS NAMED HEREIN as Initial Lenders and MIZUHO BANK, LTD. as Administrative Agent, and BANK OF AMERICA, N. A. and U.S. BANK NATIONAL ASSOCIATION. as Co-Syndication Agents Arranged by: MIZUHO BANK

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 8, 2021 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) ? ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 or ? TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 A. Full tit

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) ? ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 or ? TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 A. Full tit

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 4, 2021 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

Packaging Corporation of America Certain statements in this presentation are forward-looking statements. Forward-looking statements include statements about our future financial condition, our industry and our business strategy. Statements that conta

Exhibit 99.1 Packaging Corporation of America KeyBanc Industrials & Basic Materials Conference June 4, 2021 Mark W. Kowlzan Robert P. Mundy Chairman & CEO Executive V. P. & CFOExhibit 99.1 Packaging Corporation of America KeyBanc Industrials & Basic Materials Conference June 4, 2021 Mark W. Kowlzan Robert P. Mundy Chairman & CEO Executive V. P. & CFO Packaging Corporation of America Certain statem

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 4, 2021 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Registra

PACKAGING CORPORATION OF AMERICA REPORTS FIRST QUARTER 2021 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS FIRST QUARTER 2021 RESULTS Lake Forest, IL, April 26, 2021 ? Packaging Corporation of America (NYSE: PKG) today reported first quarter 2021 net income of $167 million, or $1.75 per share, and net income of $169 million, or $1.77 per share, excluding special items. First quarter net sales were $1.8 billion in 2021 and $1.7 billion in 2020. Dilut

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 26, 2021 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer

- DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the registrant ? Filed by a party other than the registrant ? Check the appropriate box: ? Preliminary proxy statement ? Confidential, for use of

- DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the registrant ? Filed by a party other than the registrant ? Check the appropriate box: ? Preliminary proxy statement ? Confidential, for use of

Financial Statements and Exhibits, Material Impairments, Costs Associated with Exit or Disposal Activities, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 25, 2021 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

Packaging Corporation of America Announces Conversion of Jackson, AL Mill Paper Machine to High-Performance Virgin Linerboard

Exhibit 99.1 Packaging Corporation of America Announces Conversion of Jackson, AL Mill Paper Machine to High-Performance Virgin Linerboard Lake Forest, IL, February 25, 2021 ? Packaging Corporation of America (NYSE: PKG) today announced that it has discontinued production of uncoated freesheet (UFS) grades on the No. 3 paper machine at its Jackson, AL mill and will begin preparing for the permanen

Subsidiaries of the Registrant.

Exhibit 21.1 Subsidiaries of the Registrant * State or Other Jurisdiction of Incorporation or Organization Packaging Corporation of America (100%) Delaware PCA Corrugated and Display, LLC (100%) Delaware Polywoven Distributors PA, LLC (51%) Pennsylvania PCA International Inc. (100%) Delaware PCA International Services, LLC (100%) Delaware PCA Hydro Inc. (100%) Delaware Packaging Corporation of Asi

Powers of Attorney.

Exhibit 24.1 SPECIAL POWER OF ATTORNEY The undersigned constitutes and appoints Mark W. Kowlzan, Robert P. Mundy and Kent A. Pflederer, and each of them, his true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him and in his name, place, and stead, in any and all capacities, to sign the Annual Report on Form 10-K for the fiscal year ended December 31,

Annual Report - 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission file number 1-15399 (Exact Name of Registrant as Sp

SCHEDULE 13G

SC 13G 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Packaging Corp. of America (Name of Issuer) Common Stock (Title of Class of Securities) 695156109 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 9)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 9)* Name of issuer: Packaging Corp. of America Title of Class of Securities: Common Stock CUSIP Number: 695156109 Date of Event Which Requires Filing of this Statement: December 31, 2020 Check the appropriate box to designate the rule pursuant to which this Schedule is f

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 01)* Packaging Corporation of America (Name of Issuer) Common Stock (Title of Class of Securities) (CUSIP Nu

Schedule 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 01)* Packaging Corporation of America (Name of Issuer) Common Stock (Title of Class of Securities) 695156109 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule

Financial Statements and Exhibits, Results of Operations and Financial Condition - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 27, 2021 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employ

PACKAGING CORPORATION OF AMERICA REPORTS FOURTH QUARTER AND FULL YEAR 2020 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS FOURTH QUARTER AND FULL YEAR 2020 RESULTS Lake Forest, IL, January 27, 2021 – Packaging Corporation of America (NYSE: PKG) today reported fourth quarter 2020 net income of $124 million, or $1.30 per share, and net income of $127 million, or $1.33 per share, excluding special items. Fourth quarter net sales were $1.7 billion in both 2020 and 201

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): December 10, 2020 PACKAGING CORPORATION OF AMERICA (Exact Name of Registrant as Specified in Its Charter) Delaware (State or Other Jurisdiction of Incorporation) 1-15399 36-4277050 (C

Amended and Restated By-laws of PCA. (Incorporated herein by reference to Exhibit 3.1 to PCA’s Current Report on Form 8-K filed December 13, 2020, File No. 1-15399.)

EX-3.1 Exhibit 3.1 AMENDED AND RESTATED BY-LAWS OF PACKAGING CORPORATION OF AMERICA A Delaware Corporation (Effective as of December 10, 2020) ARTICLE I OFFICES Section 1. Registered Office. The registered office of Packaging Corporation of America (the “Corporation”) in the State of Delaware shall be located at the Corporation Trust Center, 1209 Orange Street, in the City of Wilmington, Delaware,

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Regi

Financial Statements and Exhibits, Results of Operations and Financial Condition - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 26, 2020 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employ

PACKAGING CORPORATION OF AMERICA REPORTS THIRD QUARTER 2020 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS THIRD QUARTER 2020 RESULTS Lake Forest, IL, October 26, 2020 – Packaging Corporation of America (NYSE: PKG) today reported third quarter 2020 net income of $139 million, or $1.46 per share, and net income of $149 million, or $1.57 per share, excluding special items. Third quarter net sales were $1.69 billion in 2020 and $1.75 billion in 2019. D

Regulation FD Disclosure - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 9, 2020 PACKAGING CORPORATION OF AMERICA (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (C

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Registran

PACKAGING CORPORATION OF AMERICA REPORTS SECOND QUARTER 2020 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS SECOND QUARTER 2020 RESULTS Lake Forest, IL, July 28, 2020 – Packaging Corporation of America (NYSE: PKG) today reported second quarter 2020 net income of $57 million, or $0.59 per share, and net income of $132 million, or $1.38 per share, excluding special items. Second quarter net sales were $1.54 billion in 2020 and $1.76 billion in 2019. Di

Financial Statements and Exhibits, Material Impairments, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 24, 2020 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer

- 11-K

11-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 A. Full title of the pla

- 11-K

11-K Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 24, 2020 PACKAGING CORPORATION OF AMERICA (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commi

- S-8

S-8 As filed with the Securities and Exchange Commission on May 11, 2020 Registration No.

- S-8 POS

S-8 POS As filed with the Securities and Exchange Commission on May 11, 2020 Registration No.

- S-8

S-8 As filed with the Securities and Exchange Commission on May 11, 2020 Registration No.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 5, 2020 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Registra

PACKAGING CORPORATION OF AMERICA REPORTS FIRST QUARTER 2020 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS FIRST QUARTER 2020 RESULTS Lake Forest, IL, April 27, 2020 – Packaging Corporation of America (NYSE: PKG) today reported first quarter 2020 net income of $142 million, or $1.49 per share, and net income of $143 million, or $1.50 per share, excluding special items. First quarter net sales were $1.7 billion in 2020 and 2019. Diluted earnings per

Financial Statements and Exhibits, Costs Associated with Exit or Disposal Activities, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 27, 2020 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 1, 2020 PACKAGINGCORPORATION OF AMERICA (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commis

PCA Announces Plans to Take Economic Downtime at its Jackson, AL Uncoated Freesheet Mill

EX-99.1 Exhibit 99.1 PCA Announces Plans to Take Economic Downtime at its Jackson, AL Uncoated Freesheet Mill LAKE FOREST, IL, April 1, 2020 — Packaging Corporation of America (NYSE: PKG) today announced plans to temporarily idle both paper machines and the sheet-converting operation at its Jackson Mill in Jackson, AL for the months of May and June 2020. This is expected to reduce paper production

Amended and Restated 1999 Long-Term Equity Incentive Plan*

DEF 14A Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K/A (Amendment No.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 25, 2020 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

Packaging Corporation of America Supplemental Executive Retirement Plan, as Amended and Restated Effective as of February 27, 2019. (Incorporated herein by reference to Exhibit 10.4 to PCA's Annual Report on Form 10-K for the year ended December 31, 2019, File No. 1-15399).*

Exhibit 10.4 PACKAGING CORPORATION OF AMERICA SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN (As Amended and Restated Effective as of February 27, 2019) PACKAGING CORPORATION OF AMERICA SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN (As Amended and Restated Effective as of February 27, 2019) INTRODUCTION The Packaging Corporation of America Supplemental Executive Retirement Plan was originally established Novembe

Subsidiaries of the Registrant.

Exhibit 21.1 Subsidiaries of the Registrant * State or Other Jurisdiction of Incorporation or Organization Packaging Corporation of America (100%) Delaware PCA Corrugated and Display, LLC (100%) Delaware Polywoven Distributors PA, LLC (51%) Pennsylvania PCA International Inc. (100%) Delaware PCA International Services, LLC (100%) Delaware PCA Hydro Inc. (100%) Delaware Packaging Corporation of Asi

Packaging Corporation of America Deferred Compensation Plan, as Amended and Restated Effective as of February 27, 2019. (Incorporated herein by reference to Exhibit 10.5 to PCA's Annual Report on Form 10-K for the year ended December 31, 2019, File No. 1-15399).*

Exhibit 10.5 PACKAGING CORPORATION OF AMERICA DEFERRED COMPENSATION PLAN (As Amended and Restated Effective as of February 27, 2019) PACKAGING CORPORATION OF AMERICA DEFERRED COMPENSATION PLAN (As Amended and Restated Effective as of February 27, 2019) 1.Introduction and Purpose. The Packaging Corporation of America Deferred Compensation Plan was originally established April 12, 1999 by Packaging

Powers of Attorney.

Exhibit 24.1 SPECIAL POWER OF ATTORNEY The undersigned constitutes and appoints Mark W. Kowlzan, Robert P. Mundy and Kent A. Pflederer, and each of them, his true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him and in his name, place, and stead, in any and all capacities, to sign the Annual Report on Form 10-K for the fiscal year ended December 31,

Description of Common Stock. (Incorporated herein by reference to Exhibit 4.13 to PCA's Annual Report on Form 10-K for the year ended December 31, 2019, File No. 1-15399).

Exhibit 4.13 DESCRIPTION OF CAPITAL STOCK PCA's certificate of incorporation authorizes the issuance of up to 300,000,000 shares of common stock, par value $0.01 per share and 3,000,000 shares of preferred stock, par value $0.01 per share. As of December 31, 2019, 94,654,516 shares of common stock were issued and outstanding and no shares of preferred stock were outstanding. All outstanding shares

Trade Vendor Purchasing Agreement, dated December 6, 2019, between Boise White Paper, L.L.C. and Office Depot, Inc. (Incorporated by reference to Exhibit 10.11 to PCA's Annual Report on Form 10-K for the year ended December 31, 2019, File No. 1-15399)**

Exhibit 10.11 DocuSign Envelope ID: 7725A470-8B49-45A8-9579-0BE10942E3AB NOTICE: Certain identified information has been excluded from this exhibit because it both (i) is not material and (ii) would be competitively harmful if publicly disclosed. Omittted information is marked with brackets: [***]. 2019 TRADE VENDOR PURCHASING AGREEMENT VENDOR LEGAL NAME: Boise White Paper, L.L.C. Federal Tax ID:

Annual Report - 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission file number 1-15399 (Exact Name of Registrant as Sp

PKG / Packaging Corp. of America / MANAGED ACCOUNT ADVISORS LLC - NONE Passive Investment

Schedule 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. n/a )* PACKAGING CORP OF AMERICA (Name of Issuer) Common Stock (Title of Class of Securities) 695156109 (CUSIP Number) December 31, 2019 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule purs

PKG / Packaging Corp. of America / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 8)* Name of issuer: Packaging Corp of America Title of Class of Securities: Common Stock CUSIP Number: 695156109 Date of Event Which Requires Filing of this Statement: December 31, 2019 Check the appropriate box to designate the rule pursuant to which this Schedule is fi

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 29, 2020 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employ

PACKAGING CORPORATION OF AMERICA REPORTS FOURTH QUARTER AND FULL YEAR 2019 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS FOURTH QUARTER AND FULL YEAR 2019 RESULTS Lake Forest, IL, January 29, 2020 – Packaging Corporation of America (NYSE: PKG) today reported fourth quarter 2019 net income of $136 million, or $1.43 per share, and net income of $163 million, or $1.71 per share, excluding special items. Fourth quarter net sales were $1.7 billion in both 2019 and 201

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 10, 2019 PACKAGING CORPORATION OF AMERICA (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (C

Underwriting Agreement, dated November 18, 2019

EX-1.1 Exhibit 1.1 PACKAGING CORPORATION OF AMERICA $500,000,000 3.000% SENIOR NOTES DUE 2029 $400,000,000 4.050% SENIOR NOTES DUE 2049 UNDERWRITING AGREEMENT November 18, 2019 Deutsche Bank Securities Inc. Wells Fargo Securities, LLC As Representatives of the Several Underwriters c/o Deutsche Bank Securities Inc. 60 Wall Street, 4th Floor New York, New York 10005 c/o Wells Fargo Securities, LLC 5

Officers’ Certificate, dated as of November 21, 2019, pursuant to Section 301 of the Indenture establishing 3.000% Senior Notes due 2029 and 4.050% Senior Notes due 2049. (Incorporated herein by reference to Exhibit 4.1 to PCA’s Current Report on Form 8-K filed November 21, 2019, File No. 1-15399.)

EX-4.1 Exhibit 4.1 PACKAGING CORPORATION OF AMERICA OFFICERS’ CERTIFICATE Dated as of November 21, 2019 Pursuant to the authority granted by the Board of Directors of Packaging Corporation of America (the “Company”) in its Resolutions of the Board of Directors of the Company, dated November 12, 2019 and pursuant to Section 301 of the Indenture, dated as of July 21, 2003 (the “Indenture”), by and b

4.050% Senior Notes due 2049. (Incorporated herein by reference to Exhibit 4.3 to PCA’s Current Report on Form 8-K filed November 21, 2019, File No. 1-15399.)

EX-4.3 Exhibit 4.3 THIS NOTE IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITORY OR A NOMINEE THEREOF. THIS NOTE IS EXCHANGEABLE FOR NOTES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITORY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE AND, UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 18, 2019 PACKAGE CORPORATION OF AMERICA (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Com

3.000% Senior Notes due 2029. (Incorporated herein by reference to Exhibit 4.2 to PCA’s Current Report on Form 8-K filed November 21, 2019, File No. 1-15399.)

EX-4.2 Exhibit 4.2 THIS NOTE IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITORY OR A NOMINEE THEREOF. THIS NOTE IS EXCHANGEABLE FOR NOTES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITORY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE AND, UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR

CALCULATION OF REGISTRATION FEE Title of Securities to be registered (1) Amount to be Registered Maximum Offering Price Per Unit Maximum Aggregate Offering Price Amount of Registration Fee (1) 3.000% Senior Notes due 2029 $500,000,000 99.869% $499,34

424B5 Table of Contents CALCULATION OF REGISTRATION FEE Title of Securities to be registered (1) Amount to be Registered Maximum Offering Price Per Unit Maximum Aggregate Offering Price Amount of Registration Fee (1) 3.

Packaging Corporation of America $500,000,000 3.000% Senior Notes Due 2029 (the “2029 Notes”) $400,000,000 4.050% Senior Notes Due 2049 (the “2049 Notes”) Pricing Term Sheet November 18, 2019 Terms Applicable to Each Series of Notes Issuer: Packaging

FWP Filed pursuant to Rule 433 Dated November 18, 2019 Relating to Preliminary Prospectus Supplement dated November 18, 2019 to Prospectus dated December 6, 2017 Registration Statement No.

Subject to Completion, Dated November 18, 2019

424B3 Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-221917 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities, and we are not soliciting an offer to buy these securities, in any jurisdiction where the offer or sale is

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Regi

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 23, 2019 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employ

PACKAGING CORPORATION OF AMERICA REPORTS THIRD QUARTER 2019 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS THIRD QUARTER 2019 RESULTS Lake Forest, IL, October 23, 2019 – Packaging Corporation of America (NYSE: PKG) today reported third quarter 2019 net income of $180 million, or $1.89 per share, and net income of $182 million, or $1.92 per share, excluding special items. Third quarter net sales were $1.8 billion in 2019 and 2018. Diluted earnings pe

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Registran

Form of 2019 Executive Officer Performance Unit Award – ROIC. †

Exhibit 10.2 PACKAGING CORPORATION OF AMERICA AMENDED AND RESTATED 1999 LONG-TERM EQUITY INCENTIVE PLAN PERFORMANCE UNIT AGREEMENT-ROIC PARTICIPANT: DATE OF GRANT: June 28, 2019 NUMBER OF PERFORMANCE UNITS: PERFORMANCE PERIOD: 2020-2022 This Agreement is entered into between Packaging Corporation of America, a Delaware corporation (the "Company"), and the Participant named above. In consideration

Form of 2019 Executive Officer Restricted Stock Award. †

Exhibit 10.1 Packaging Corporation of America Amended and Restated 1999 Long-Term Equity Incentive Plan Executive Officer Restricted Stock Award Agreement By this agreement, Packaging Corporation of America (“PCA” or the “Company”) grants to EMPLOYEE NAME the following restricted shares of the Company’s common stock, $.01 par value, subject to the terms and conditions set forth below, in the attac

Form of 2019 Executive Officer Performance Unit Award – TSR. †

Exhibit 10.3 PACKAGING CORPORATION OF AMERICA AMENDED AND RESTATED 1999 LONG-TERM EQUITY INCENTIVE PLAN PERFORMANCE UNIT AGREEMENT-TSR PARTICIPANT: DATE OF GRANT: June 28, 2019 NUMBER OF PERFORMANCE UNITS: PERFORMANCE PERIOD: July 1, 2019 to June 30, 2022 This Agreement is entered into between Packaging Corporation of America, a Delaware corporation (the "Company"), and the Participant named above

PACKAGING CORPORATION OF AMERICA REPORTS SECOND QUARTER 2019 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS SECOND QUARTER 2019 RESULTS Lake Forest, IL, July 24, 2019 – Packaging Corporation of America (NYSE: PKG) today reported second quarter 2019 net income of $194 million, or $2.04 per share. Second quarter net sales were $1.8 billion in both 2019 and 2018. Diluted earnings per share attributable to Packaging Corporation of America shareholders Th

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 24, 2019 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer

Form 11-K

11-K Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

Form 11-K

11-K Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

PKG / Packaging Corp. of America 11-K - - 11-K

11-K Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Submission of Matters to a Vote of Security Holders

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 7, 2019 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Registra

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 24, 2019 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer

PACKAGING CORPORATION OF AMERICA REPORTS FIRST QUARTER 2019 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS FIRST QUARTER 2019 RESULTS Lake Forest, IL, April 24, 2019 – Packaging Corporation of America (NYSE: PKG) today reported first quarter 2019 net income of $187 million, or $1.97 per share and $1.98 per share excluding special items. First quarter net sales were $1.73 billion in 2019 and $1.69 billion in 2018. Diluted earnings per share attributa

PKG / Packaging Corp. of America DEF 14A

DEF 14A Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Subsidiaries of the Registrant.

Exhibit 21.1 Subsidiaries of the Registrant * State or Other Jurisdiction of Incorporation or Organization Packaging Corporation of America (100%) Delaware PCA Corrugated and Display, LLC (100%) Delaware Polywoven Distributors PA, LLC (51%) Pennsylvania PCA International Inc. (100%) Delaware PCA International Services, LLC (100%) Delaware PCA Hydro Inc. (100%) Delaware Packaging Corporation of Asi

Powers of Attorney.

Exhibit 24.1 SPECIAL POWER OF ATTORNEY The undersigned constitutes and appoints Mark W. Kowlzan, Robert P. Mundy and Kent A. Pflederer, and each of them, his true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him and in his name, place, and stead, in any and all capacities, to sign the Annual Report on Form 10-K for the fiscal year ended December 31,

Form 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 Commission file number 1-15399 (Exact Name of Registrant as Specified in its Charter) Delaware 36-4277050 (State or Other Jurisdiction of Incorporation or Organization) (I.R.S. Employer Ide

PKG / Packaging Corp. of America / Wellington Management Group LLP - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* Packaging Corporation of America (Name of Issuer) Common Stock (Title of Class of Securities) 695156109 (CUSIP Number) December 31, 2018 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to

PKG / Packaging Corp. of America / VANGUARD GROUP INC Passive Investment

packagingcorpofamerica.htm - Generated by SEC Publisher for SEC Filing SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 7 )* Name of issuer: Packaging Corp of America Title of Class of Securities: Common Stock CUSIP Number: 695156109 Date of Event Which Requires Filing of this Statement: December 31, 2018 Check the app

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 29, 2019 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employ

PACKAGING CORPORATION OF AMERICA REPORTS FOURTH QUARTER AND FULL YEAR 2018 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS FOURTH QUARTER AND FULL YEAR 2018 RESULTS Lake Forest, IL, January 29, 2019 – Packaging Corporation of America (NYSE: PKG) today reported fourth quarter 2018 net income of $205 million, or $2.16 per share and $2.17 per share excluding special items. Fourth quarter net sales were $1.75 billion in 2018 and $1.68 billion in 2017. Full year 2018 ne

PKG / Packaging Corp. of America 10-Q (Quarterly Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2018 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Regi

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 24, 2018 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employ

PACKAGING CORPORATION OF AMERICA REPORTS THIRD QUARTER 2018 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS THIRD QUARTER 2018 RESULTS Lake Forest, IL, October 24, 2018 – Packaging Corporation of America (NYSE: PKG) today reported third quarter 2018 net income of $207 million, or $2.18 per share, and net income of $211 million, or $2.23 per share, excluding special items. Third quarter net sales were $1.8 billion in 2018 and $1.6 billion in 2017. Dil

Form of Restricted Stock Agreement for executive officer awards. (Incorporated by reference to Exhibit 10.1 to PCA’s Quarterly Report on Form 10-Q for the period ended June 30, 2018, File No. 1-15399).*

Exhibit 10.1 Packaging Corporation of America Amended and Restated 1999 Long-Term Equity Incentive Plan Executive Officer Restricted Stock Award Agreement By this agreement, Packaging Corporation of America (“PCA” or the “Company”) grants to you the following restricted shares of the Company’s common stock, $.01 par value, subject to the terms and conditions set forth below, in the attached Plan P

PKG / Packaging Corp. of America 10-Q (Quarterly Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2018 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Registran

Form of Total Shareholder Return Performance Unit Agreement for executive officer awards. (Incorporated by reference to Exhibit 10.3 to PCA’s Quarterly Report on Form 10-Q for the period ended June 30, 2018, File No. 1-15399).*

Exhibit 10.3 PACKAGING CORPORATION OF AMERICA AMENDED AND RESTATED 1999 LONG-TERM EQUITY INCENTIVE PLAN PERFORMANCE UNIT AGREEMENT-TSR PARTICIPANT: DATE OF GRANT: June 26, 2018 NUMBER OF PERFORMANCE UNITS: PERFORMANCE PERIOD: July 1, 2018 to June 30, 2021 This Agreement is entered into between Packaging Corporation of America, a Delaware corporation (the "Company"), and the Participant named above

Form of Return on Invested Capital Performance Unit Agreement for executive officer awards. (Incorporated by reference to Exhibit 10.2 to PCA’s Quarterly Report on Form 10-Q for the period ended June 30, 2018, File No. 1-15399).*

Exhibit 10.2 PACKAGING CORPORATION OF AMERICA AMENDED AND RESTATED 1999 LONG-TERM EQUITY INCENTIVE PLAN PERFORMANCE UNIT AGREEMENT-ROIC PARTICIPANT: DATE OF GRANT: June 26, 2018 NUMBER OF PERFORMANCE UNITS: PERFORMANCE PERIOD: 2019-2021 This Agreement is entered into between Packaging Corporation of America, a Delaware corporation (the "Company"), and the Participant named above. In consideration

PACKAGING CORPORATION OF AMERICA REPORTS SECOND QUARTER 2018 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS SECOND QUARTER 2018 RESULTS Lake Forest, IL, July 25, 2018 – Packaging Corporation of America (NYSE: PKG) today reported second quarter 2018 net income of $187 million, or $1.97 per share and net income of $197 million, or $2.08 per share, excluding special items. Second quarter net sales were $1.8 billion in 2018 and $1.6 billion in 2017. Dilu

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 25, 2018 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer

PKG / Packaging Corp. of America 11-K

11-K Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

PKG / Packaging Corp. of America 11-K

11-K Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

PKG / Packaging Corp. of America 11-K

11-K Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

Submission of Matters to a Vote of Security Holders

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 15, 2018 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

PKG / Packaging Corp. of America 10-Q (Quarterly Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2018 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-15399 (Exact Name of Registra

PACKAGING CORPORATION OF AMERICA REPORTS FIRST QUARTER 2018 RESULTS

Exhibit 99.1 PACKAGING CORPORATION OF AMERICA REPORTS FIRST QUARTER 2018 RESULTS Lake Forest, IL, April 24, 2018 – Packaging Corporation of America (NYSE: PKG) today reported first quarter 2018 net income of $140 million, or $1.48 per share and $1.55 per share excluding special items. First quarter net sales were $1.7 billion in 2018 and $1.5 billion in 2017. Diluted earnings per share attributabl

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 24, 2018 (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer

PKG / Packaging Corp. of America DEF 14A

DEF 14A Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Subsidiaries of the Registrant.

EX-21.1 4 pkg-ex211153.htm EX-21.1 Exhibit 21.1 Subsidiaries of the Registrant * State or Other Jurisdiction of Incorporation or Organization Packaging Corporation of America (100%) Delaware PCA Corrugated and Display, LLC (100%) Delaware Polywoven Distributors PA, LLC (51%) Pennsylvania PCA International Inc. (100%) Delaware PCA International Services, LLC (100%) Delaware PCA Hydro Inc. (100%) De

Amended and Restated Executive Incentive Compensation Plan, effective as of December 29, 2017. (Incorporated herein by reference to Exhibit 10.10 to PCA's Annual Report on Form 10-K for the year ended December 31, 2017, File No. 1-15399.)*

Exhibit 10.10 PACKAGING CORPORATION OF AMERICA Amended and Restated EXECUTIVE INCENTIVE COMPENSATION PLAN Effective: December 29, 2017 Page 1 of 6 PACKAGING CORPORATION OF AMERICA amended and restated EXECUTIVE INCENTIVE COMPENSATION PLAN Section 1 – Establishment and Purpose 1.1 Establishment of this Plan. Packaging Corporation of America hereby establishes the “PACKAGING CORPORATION OF AMERICA A

Statement Regarding Computation of Ratio of Earnings to Fixed Charges.

Exhibit 12.1 Ratio of Earnings to Fixed Charges Year Ended December 31 Amounts in millions, except ratios 2017 2016 2015 2014 2013 Ratio of Earnings to Fixed Charges 7.0 x 6.5 x 6.7 x 6.1 x 6.4 x Details of the specific calculations are set forth below: Year Ended December 31 2017 2016 2015 2014 2013 Earnings Income before taxes $ 828.6 $ 688.5 $ 664.5 $ 614.3 $ 423.6 Add: Fixed charges 138.6 123.

Powers of Attorney.

Exhibit 24.1 SPECIAL POWER OF ATTORNEY The undersigned constitutes and appoints Mark W. Kowlzan, Robert P. Mundy and Kent A. Pflederer, and each of them, his true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him and in his name, place, and stead, in any and all capacities, to sign the Annual Report on Form 10-K for the fiscal year ended December 31,

PKG / Packaging Corp. of America 10-K (Annual Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2017 Commission file number 1-15399 (Exact Name of Registrant as Specified in its Charter) Delaware 36-4277050 (State or Other Jurisdiction of Incorporation or Organization) (I.R.S. Employer Ide

PKG / Packaging Corp. of America / VANGUARD GROUP INC Passive Investment

packagingcorpofamerica.htm - Generated by SEC Publisher for SEC Filing SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 6 )* Name of issuer: Packaging Corp of America Title of Class of Securities: Common Stock CUSIP Number: 695156109 Date of Event Which Requires Filing of this Statement: December 31, 2017 Check the app

PKG / Packaging Corp. of America / Wellington Management Group LLP - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Packaging Corporation of America (Name of Issuer) Common Stock (Title of Class of Securities) 695156109 (CUSIP Number) December 29, 2017 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to wh