PDFS / PDF Solutions, Inc. - SEC-arkiveringar, Årsredovisning, Fullmaktsutlåtande

Certification of the principal executive officer pursuant to Exchange Act Rules 13a‑14(a) and 15d‑14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31.01 CERTIFICATIONS I, John K. Kibarian, certify that: 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with re

Q2 2025 Management Report August 7, 2025

Exhibit 99.2 Q2 2025 Management Report August 7, 2025 1 Contents ■ Q2 2025 Results – Overview – Key Financial & Operating Metrics – Revenue by Geographic Area ■ Q2 2025 Non-GAAP Results – Reconciliation of GAAP Net Income (Loss) to Non-GAAP Net Income – Reconciliation of GAAP to Non-GAAP Spending by Function ■ Related Information The following commentary is provided by management and should be ref

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

Table of Contents 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 000-31311 PDF

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.*

Exhibit 32.02 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended June 30, 2025, as filed with the Securities and Exchange Commission on August 7, 2025 (the “Report”), I, Adnan Raza, Executive Vice President, Finance an

Certification of the principal financial and accounting officer pursuant to Exchange Act Rules 13a‑14(a) and 15d‑14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31.02 CERTIFICATIONS I, Adnan Raza, certify that: 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect

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): August 7, 2025 PDF SOLUTIONS, INC

Table of Contents 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): August 7, 2025 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Juri

PDF Solutions® Reports Second Quarter 2025 Financial Results Announces Record Second Quarter 2025 Total Revenues

Exhibit 99.1 2858 De La Cruz Boulevard, Santa Clara CA 95050 USA +1.408.280.7900 www.pdf.com News Release Company Contacts: Adnan Raza Sonia Segovia Chief Financial Officer Investor Relations Tel: (408) 280-7900 Tel: (408) 938-6491 Email: [email protected] Email: [email protected] PDF Solutions® Reports Second Quarter 2025 Financial Results Announces Record Second Quarter 2025 Total Revenues

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.*

Exhibit 32.01 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended June 30, 2025, as filed with the Securities and Exchange Commission on August 7, 2025 (the “Report”), I, John K. Kibarian, President and Chief Executive

Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

Table of Contents 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 17, 2025 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Juris

PDF Solutions, Inc.’s Second Amended and Restated 2021 Employee Stock Purchase Plan

Exhibit 10.2 PDF Solutions, Inc. Second Amended and Restated 2021 Employee Stock Purchase Plan SECTION 1. PURPOSE. The purpose of this Second Amended and Restated 2021 Employee Stock Purchase Plan (“Plan”) is to provide eligible employees of the Company and its participating Subsidiaries with the opportunity to purchase Common Stock through payroll deductions. The Plan consists of two components:

PDF Solutions, Inc.’s Tenth Amended and Restated 2011 Stock Incentive Plan

Exhibit 10.1 PDF Solutions, Inc. Tenth Amended and Restated 2011 Stock Incentive Plan SECTION 1. INTRODUCTION On November 16, 2011, the original 2011 Stock Incentive Plan became effective upon approval by our stockholders (the “Effective Date”). On May 28, 2013, the stockholders approved the First Amended and Restated 2011 Stock Incentive Plan to increase the authorized share limit. On May 27, 201

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) Delaware 000‑31311 25‑1701361 (State or other jurisdiction of Incorporation or organization) (Commission file number) (I.R.S. Employer Identification No.) 2858 De La Cruz Blvd Santa Clara, CA 95050 (Address of princ

Conflict Minerals Report as required by Items 1.01 and 1.02 of this Form.

Exhibit 1.01 Conflict Minerals Report of PDF Solutions, Inc. In Accordance with Rule 13p-1 under the Securities Exchange Act of 1934 This is the Conflict Minerals Report of PDF Solutions, Inc. (the “Company”) for calendar year 2024 in accordance with Rule 13p-1 (“Rule 13p-1”) under the Securities Exchange Act of 1934 (the “1934 Act”). Please refer to Rule 13p-1, Form SD and the 1934 Act Release No

PDF Solutions® Announces First Quarter 2025 Financial Results

Exhibit 99.1 2858 De La Cruz Boulevard, Santa Clara CA 95050 USA +1.408.280.7900 www.pdf.com News Release Company Contacts: Adnan Raza Sonia Segovia Chief Financial Officer Investor Relations Tel: (408) 516-0237 Tel: (408) 938-6491 Email: [email protected] Email: [email protected] PDF Solutions® Announces First Quarter 2025 Financial Results Santa Clara, CA, May 8, 2025 – PDF Solutions, Inc.

Financial Statements and Exhibits, Results of Operations and Financial Condition

Table of Contents 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): May 8, 2025 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Jurisdi

Q1 2025 Management Report May 8, 2025

a Exhibit 99.2 Q1 2025 Management Report May 8, 2025 1 Contents ■ Q1 2025 Results – Overview – Key Financial & Operating Metrics – Revenue by Geographic Area ■ Q1 2025 Non-GAAP Results – Reconciliation of GAAP Net Income (Loss) to Non-GAAP Net Income – Reconciliation of GAAP to Non-GAAP Spending by Function ■ Related Information The following commentary is provided by management and should be refe

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

Table of Contents 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 000-31311 PDF

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A 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 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 the Commission Only (as permitted by Rule 14a-6(e)(2)) ◻ Definitive Proxy State

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A 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 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 the Commission Only (as permitted by Rule 14a-6(e)(2)) ☑ Defi

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Completion of Acquisition or Disposition of Assets

Table of Contents 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): March 7, 2025 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Juris

Credit Agreement, dated as of March 7, 2025, by and among PDF Solutions, Inc., Wells Fargo Bank, National Association and the lenders who are party to the Agreement and the lenders who may become a party to the Agreement.

Execution Version $70,000,000 CREDIT AGREEMENT dated as of March 7, 2025, by and among PDF SOLUTIONS, INC.

Consent of BPM LLP, Independent Registered Public Accounting Firm

Exhibit 23.01 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statements on Form S 8 (Nos. 333-281385, 333-257792, 333-233070, 333-202455, 333-180324, 333-167533, 333-159211, 333-149281, 333-141660, 333-133332, 333-112728, 333-109809, and 333-102509) of PDF Solutions, Inc. of our reports dated February 27, 2025 relati

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002†

EXHIBIT 32.02 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of PDF Solutions, Inc. (the “Company”) on Form 10-K for the year ended December 31, 2024 as filed with the Securities and Exchange Commission on February 27, 2025 (the “Report”), I, Adnan Raza, Executive Vice President, Finance an

PDF Solutions, Inc. Ninth Amended and Restated 2011 Stock Incentive Plan*

‌Exhibit 10.03 PDF Solutions, Inc. Ninth Amended and Restated 2011 Stock Incentive Plan SECTION 1. INTRODUCTION On November 16, 2011, the original 2011 Stock Incentive Plan became effective upon approval by our stockholders (the “Effective Date”). On May 28, 2013, the stockholders approved the First Amended and Restated 2011 Stock Incentive Plan to increase the authorized share limit. On May 27, 2

Certifications of the principal executive officer and principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

EXHIBIT 31.01 CERTIFICATIONS I, John K. Kibarian, certify that: 1. I have reviewed this annual report on Form 10-K of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respe

Certifications of the principal executive officer and principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

EXHIBIT 31.02 CERTIFICATIONS I, Adnan Raza, certify that: 1. I have reviewed this annual report on Form 10-K of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to

Insider Trading and Disclosure Policy

Exhibit 19.01 Adopted as revised: February 10, 2025 INSIDER TRADING AND DISCLOSURE POLICY 1. Purpose This document sets forth the Insider Trading and Disclosure Policy (the “Policy”) regarding trading in the stock and other securities of PDF Solutions, Inc. (the “Company”) and, where applicable, the disclosure of such transactions. All references to the “Company” in the document include any subsid

Subsidiaries of Registrant

Exhibit 21.01 Subsidiaries of Registrant Name of Entity Jurisdiction of Incorporation or Organization Cimetrix Incorporated Nevada Cimetrix International, Inc. Nevada Cimetrix Japan KK Japan Cimetrix Software (Shanghai) Co., Ltd. China PDF Solutions Asia Services, Inc. Delaware PDF Solutions Canada Ltd. Canada PDF Solutions GmbH Germany PDF Solutions International Services, Inc. Delaware PDF Solut

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K (Mark One) ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 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 000-31311 (Commission file num

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002†

EXHIBIT 32.01 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of PDF Solutions, Inc. (the “Company”) on Form 10-K for the year ended December 31, 2024 as filed with the Securities and Exchange Commission on February 27, 2025 (the “Report”), I, John K. Kibarian, President and Chief Executive

Equity Purchase Agreement, dated as of February 19, 2025, by and among PDF Solutions, Inc., SecureWise LLC and Telit IOT Solutions Inc.

Exhibit No. 2.1 CERTAIN INFORMATION INDICATED WITH [****] IN THIS DOCUMENT HAS BEEN OMITTED FROM THIS EXHIBIT AS NOT MATERIAL EQUITY PURCHASE AGREEMENT BY AND AMONG PDF SOLUTIONS, INC., SECUREWISE LLC AND TELIT IOT SOLUTIONS INC DATED AS OF FEBRUARY 19, 2025 TABLE OF CONTENTS Page Article 1 PURCHASE AND SALE‌1 1.1Purchase and Sale of the Membership Interests‌1 1.2Purchase Price‌1 1.3Closing Paymen

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

Table of Contents 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): February 19, 2025 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other J

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): February 13, 2025 PDF SOLUTIONS,

Table of Contents 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): February 13, 2025 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other J

PDF Solutions® Announces Record 2024 Fourth Quarter and Full Year Total Revenues

Exhibit 99.1 2858 De La Cruz Boulevard, Santa Clara CA 95050 USA +1.408.280.7900 www.pdf.com News Release Company Contacts: Adnan Raza Sonia Segovia Chief Financial Officer Investor Relations Tel: (408) 516-0237 Tel: (408) 938-6491 Email: [email protected] Email: [email protected] PDF Solutions® Announces Record 2024 Fourth Quarter and Full Year Total Revenues Santa Clara, CA, February 13, 20

Q4 2024 and Full Year 2024 Management Report February 13, 2025

a Exhibit 99.2 Q4 2024 and Full Year 2024 Management Report February 13, 2025 1 Contents ■ Q4 2024 and Full Year 2024 Results – Overview – Key Financial & Operating Metrics – Revenue by Geographic Area ■ Q4 2024 and Full Year 2024 Non-GAAP Results – Reconciliation of GAAP Net Income (Loss) to Non-GAAP Net Income – Reconciliation of GAAP to Non-GAAP Spending by Function ■ Related Information The fo

Certification of the principal executive officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31.01 CERTIFICATIONS I, John K. Kibarian, certify that: 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with re

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.*

Exhibit 32.01 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended September 30, 2024, as filed with the Securities and Exchange Commission on November 7, 2024 (the “Report”), I, John K. Kibarian, President and Chief Exe

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

Table of Contents g UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.*

Exhibit 32.02 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended September 30, 2024, as filed with the Securities and Exchange Commission on November 7, 2024 (the “Report”), I, Adnan Raza, Executive Vice President, Fin

Certification of the principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31.02 CERTIFICATIONS I, Adnan Raza, certify that: 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect

Financial Statements and Exhibits, Results of Operations and Financial Condition

Table of Contents 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 7, 2024 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Ju

PDF Solutions® Reports Third Quarter 2024 Results

Exhibit 99.1 2858 De La Cruz Boulevard, Santa Clara CA 95050 USA +1.408.280.7900 www.pdf.com News Release Company Contacts: Adnan Raza Sonia Segovia Chief Financial Officer Investor Relations Tel: (408) 516-0237 Tel: (408) 938-6491 Email: [email protected] Email: [email protected] PDF Solutions® Reports Third Quarter 2024 Results Santa Clara, CA, November 7, 2024, – PDF Solutions, Inc. (Nasda

Q3 2024 Management Report November 7, 2024

a Exhibit 99.2 Q3 2024 Management Report November 7, 2024 1 Contents ■ Q3 2024 Results – Overview – Key Financial & Operating Metrics – Revenue by Geographic Area ■ Q3 2024 Non-GAAP Results – Reconciliation of GAAP Net Income (Loss) to Non-GAAP Net Income – Reconciliation of GAAP to Non-GAAP Spending by Function ■ Related Information The following commentary is provided by management and should be

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.*

Exhibit 32.02 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended June 30, 2024, as filed with the Securities and Exchange Commission on August 8, 2024 (the “Report”), I, Adnan Raza, Executive Vice President, Finance an

Certification of the principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31.02 CERTIFICATIONS I, Adnan Raza, certify that: 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect

Third Amended and Restated Certificate of Incorporation of PDF Solutions, Inc., and Certificate of Amendment to Third Amended and Restated Certificate of Incorporation of PDF Solutions, Inc.

Exhibit 3.01 THIRD AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF PDF SOLUTIONS, INC. The undersigned, John Kibarian and Peter Cohn, hereby certify that: 1.They are the duly elected and acting President and Secretary, respectively, of PDF Solutions, Inc., a Delaware corporation. 2.The Certificate of Incorporation of this corporation was originally filed with the Secretary of State of Delawar

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

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

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

Table of Contents g UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Filing Fee Table

Calculation of Filing Fee Tables S-8 PDF SOLUTIONS INC Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee 1 Equity Common Stock Other 3,059,126 $ 28.

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

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

Financial Statements and Exhibits, Results of Operations and Financial Condition

Table of Contents 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): August 8, 2024 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Juri

Q2 2024 Management Report August 8, 2024

a Exhibit 99.2 Q2 2024 Management Report August 8, 2024 1 Contents ■ Q2 2024 Results – Overview – Key Financial & Operating Metrics – Revenue by Geographic Area ■ Q2 2024 Non-GAAP Results – Reconciliation of GAAP Net Income (Loss) to Non-GAAP Net Income – Reconciliation of GAAP to Non-GAAP Spending by Function ■ Related Information The following commentary is provided by management and should be r

PDF Solutions® Reports Second Quarter 2024 Results

Exhibit 99.1 2858 De La Cruz Boulevard, Santa Clara CA 95050 USA +1.408.280.7900 www.pdf.com News Release Company Contacts: Adnan Raza Sonia Segovia Chief Financial Officer Investor Relations Tel: (408) 516-0237 Tel: (408) 938-6491 Email: [email protected] Email: [email protected] PDF Solutions® Reports Second Quarter 2024 Results Santa Clara, CA, August 8, 2024, – PDF Solutions, Inc. (Nasdaq

Certification of the principal executive officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31.01 CERTIFICATIONS I, John K. Kibarian, certify that: 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with re

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.*

Exhibit 32.01 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended June 30, 2024, as filed with the Securities and Exchange Commission on August 8, 2024 (the “Report”), I, John K. Kibarian, President and Chief Executive

Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

Table of Contents 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 18, 2024 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Juris

Conflict Minerals Report as required by Items 1.01 and 1.02 of this Form.

Exhibit 1.01 Conflict Minerals Report of PDF Solutions, Inc. In Accordance with Rule 13p-1 under the Securities Exchange Act of 1934 This is the Conflict Minerals Report of PDF Solutions, Inc. (“PDF Solutions” or the “Company”) for calendar year 2023 in accordance with Rule 13p-1 (“Rule 13p-1”) under the Securities Exchange Act of 1934 (the “1934 Act”). Please refer to Rule 13p-1, Form SD and the

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT PDF SOLUTIONS, INC. (Exact name of the registrant as specified in its charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT PDF SOLUTIONS, INC. (Exact name of the registrant as specified in its charter) Delaware 000-31311 25-1701361 (State or other jurisdiction of incorporation) (Commission file number) (I.R.S. Employer Identification No.) 2858 De La Cruz Blvd Santa Clara, CA 95050 (Address of principal executi

PDF Solutions® Reports First Quarter 2024 Results

Exhibit 99.1 2858 De La Cruz Boulevard, Santa Clara CA 95050 USA +1.408.280.7900 www.pdf.com News Release Company Contacts: Adnan Raza Sonia Segovia Chief Financial Officer Investor Relations Tel: (408) 516-0237 Tel: (408) 938-6491 Email: [email protected] Email: [email protected] PDF Solutions® Reports First Quarter 2024 Results Santa Clara, CA, May 9, 2024, – PDF Solutions, Inc. (Nasdaq: PD

Certification of the principal executive officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31.01 CERTIFICATIONS I, John K. Kibarian, certify that: 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with re

Q1 2024 Management Report May 9, 2024

a Exhibit 99.2 Q1 2024 Management Report May 9, 2024 1 Contents ■ Q1 2024 Results – Overview – Key Financial & Operating Metrics – Revenue by Geographic Area ■ Q1 2024 Non-GAAP Results – Reconciliation of GAAP Net Income (Loss) to Non-GAAP Net Income – Reconciliation of GAAP to Non-GAAP Spending by Function ■ Related Information The following commentary is provided by management and should be refe

Financial Statements and Exhibits, Results of Operations and Financial Condition

Table of Contents 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): May 9, 2024 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Jurisdi

Certification of the principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31.02 CERTIFICATIONS I, Adnan Raza, certify that: 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.*

Exhibit 32.02 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended March 31, 2024, as filed with the Securities and Exchange Commission on May 9, 2024 (the “Report”), I, Adnan Raza, Executive Vice President, Finance and

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.*

Exhibit 32.01 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended March 31, 2024, as filed with the Securities and Exchange Commission on May 9, 2024 (the “Report”), I, John K. Kibarian, President and Chief Executive Of

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

Table of Contents g UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A 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 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 the Commission Only (as permitted by Rule 14a-6(e)(2)) ☑ Defi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A 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 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 the Commission Only (as permitted by Rule 14a-6(e)(2)) ◻ Definitive Proxy State

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A 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 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 the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defi

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002†

EXHIBIT 32.02 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of PDF Solutions, Inc. (the “Company”) on Form 10-K for the year ended December 31, 2023 as filed with the Securities and Exchange Commission on February 27, 2024 (the “Report”), I, Adnan Raza, Executive Vice President, Finance an

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002†

EXHIBIT 32.01 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of PDF Solutions, Inc. (the “Company”) on Form 10-K for the year ended December 31, 2023 as filed with the Securities and Exchange Commission on February 27, 2024 (the “Report”), I, John K. Kibarian, President and Chief Executive

Consent of BPM LLP, Independent Registered Public Accounting Firm

Exhibit 23.01 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statements on Form S 8 (Nos. 333-257792, 333-233070, 333-202455, 333-180324, 333-167533, 333-159211, 333-149281, 333 141660, 333-133332, 333-112728, 333-109809, and 333-102509) of PDF Solutions, Inc. of our reports dated February 27, 2024 relating to the co

Certifications of the principal executive officer and principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

EXHIBIT 31.02 CERTIFICATIONS I, Adnan Raza, certify that: 1. I have reviewed this annual report on Form 10-K of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to

Compensation Recovery Policy

PDF Solutions, INC. COMPENSATION RECOVERY POLICY (Adopted and approved on November 29, 2023 and effective as of October 2, 2023) 1. Purpose PDF Solutions, Inc. (collectively with its subsidiaries, the “Company”) is committed to promoting high standards of honest and ethical business conduct and compliance with applicable laws, rules and regulations. As part of this commitment, the Company has adop

Subsidiaries of Registrant

Exhibit 21.01 Subsidiaries of Registrant Name of Entity Jurisdiction of Incorporation or Organization Cimetrix Incorporated Nevada Cimetrix International, Inc. Nevada Cimetrix Japan KK Japan Cimetrix Software (Shanghai) Co., Ltd. China PDF Solutions Asia Services, Inc. Delaware PDF Solutions Canada Ltd. Canada PDF Solutions GmbH Germany PDF Solutions International Services, Inc. Delaware PDF Solut

Board of Directors Acceleration Agreement

‌ ACCELERATION AGREEMENT Effective Date: Acceleration Agreement THIS ACCELERATION AGREEMENT (the “Agreement”) is entered into as of the Effective Date, by and between (the “Award Recipient”) and PDF Solutions, Inc.

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K (Mark One) ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 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 000-31311 (Commission file num

Certifications of the principal executive officer and principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

EXHIBIT 31.01 CERTIFICATIONS I, John K. Kibarian, certify that: 1. I have reviewed this annual report on Form 10-K of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respe

PDF Solutions® Reports Fourth Quarter and Full Year 2023 Results

Exhibit 99.1 2858 De La Cruz Boulevard, Santa Clara CA 95050 USA +1.408.280.7900 www.pdf.com News Release Company Contacts: Adnan Raza Sonia Segovia Chief Financial Officer Investor Relations Tel: (408) 516-0237 Tel: (408) 938-6491 Email: [email protected] Email: [email protected] PDF Solutions® Reports Fourth Quarter and Full Year 2023 Results Santa Clara, CA, February 15, 2024, – PDF Soluti

Financial Statements and Exhibits, Results of Operations and Financial Condition

Table of Contents 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): February 15, 2024 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other J

Q4 2023 and Full Year 2023 Management Report February 15, 2024

a Exhibit 99.2 Q4 2023 and Full Year 2023 Management Report February 15, 2024 1 Contents ■ Q4 2023 and Full Year 2023 Results – Overview – Key Financial & Operating Metrics – Revenue by Geographic Area ■ Q4 2023 and Full Year 2023 Non-GAAP Results – Reconciliation of GAAP Net Income (Loss) to Non-GAAP Net Income – Reconciliation of GAAP to Non-GAAP Spending by Function ■ Related Information The fo

PDFS / PDF Solutions, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv01669-pdfsolutionsinc.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 5)* Name of issuer: PDF Solutions Inc Title of Class of Securities: Common Stock CUSIP Number: 693282105 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box to designate

PDFS / PDF Solutions, Inc. / KIBARIAN JOHN KACHIG - SC 13G/A Passive Investment

SC 13G/A 1 tmb-20240213xsc13ga.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 19)* PDF SOLUTIONS, INC. (Name of Issuer) COMMON STOCK (Title of Class of Securities) 693282 10 5 (CUSIP Number) DECEMBER 31, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

Table of Contents 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 14, 2023 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other J

PDFS / PDF Solutions Inc. / Invesco Ltd. - SEC SCHEDULE 13G Passive Investment

SC 13G/A 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. 5 )* PDF Solutions Inc (Name of Issuer) Common Stock (Title of Class of Securities) 693282105 (CUSIP Number) November 30, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to d

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.*

Exhibit 32.01 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended September 30, 2023, as filed with the Securities and Exchange Commission on November 8, 2023 (the “Report”), I, John K. Kibarian, President and Chief Exe

Financial Statements and Exhibits, Results of Operations and Financial Condition

Table of Contents 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 8, 2023 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Ju

Certification of the principal executive officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.†

Exhibit 31.01 CERTIFICATIONS I, John K. Kibarian, certify that: 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with re

PDF Solutions® Reports Third Quarter 2023 Results

Exhibit 99.1 2858 De La Cruz Boulevard, Santa Clara CA 95050 USA +1.408.280.7900 www.pdf.com News Release Company Contacts: Adnan Raza Sonia Segovia Chief Financial Officer Investor Relations Tel: (408) 516-0237 Tel: (408) 938-6491 Email: [email protected] Email: [email protected] PDF Solutions® Reports Third Quarter 2023 Results Santa Clara, CA, November 8, 2023, – PDF Solutions, Inc. (Nasda

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

Table of Contents g UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Q3 2023 Management Report November 8, 2023

a Exhibit 99.2 Q3 2023 Management Report November 8, 2023 1 Contents ■ Q3 2023 Results – Overview – Key Financial & Operating Metrics – Revenue by Geographic Area ■ Q3 2023 Non-GAAP Results – Reconciliation of GAAP Net Income (Loss) to Non-GAAP Net Income – Reconciliation of GAAP to Non-GAAP Spending by Function ■ Related Information The following commentary is provided by management and should be

Certification of the principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.†

Exhibit 31.02 CERTIFICATIONS I, Adnan Raza, certify that: 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.*

Exhibit 32.02 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended September 30, 2023, as filed with the Securities and Exchange Commission on November 8, 2023 (the “Report”), I, Adnan Raza, Executive Vice President, Fin

PDF Solutions® Analyst Day Webcast and Presentation Availability and Financial Outlook

Exhibit 99.1 2858 De La Cruz Boulevard, Santa Clara CA 95050 USA +1.408.280.7900www.pdf.com News Release Company Contacts: Adnan Raza Sonia Segovia Chief Financial Officer Investor Relations Tel: (408) 516-0237 Tel: (408) 938-6491 Email: [email protected] Email: [email protected] PDF Solutions® Analyst Day Webcast and Presentation Availability and Financial Outlook Santa Clara, CA, October 24

Regulation FD Disclosure, Financial Statements and Exhibits

Table of Contents 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, 2023 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Ju

Q2 2023 Management Report August 8, 2023

a Exhibit 99.2 Q2 2023 Management Report August 8, 2023 1 Contents ■ Q2 2023 Results – Overview – Key Financial & Operating Metrics – Revenue by Geographic Area ■ Q2 2023 Non-GAAP Results – Reconciliation of GAAP Net Income (Loss) to Non-GAAP Net Income – Reconciliation of GAAP to Non-GAAP Spending by Function ■ Related Information The following commentary is provided by management and should be r

Addendum #1 to Revised 2020 Contract, signed March 17, 2023, by and between PDF Solutions, Inc. and Advantest America, Inc.

CERTAIN INFORMATION INDICATED WITH [***] IN THIS DOCUMENT HAS BEEN OMITTED FROM THIS EXHIBIT BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY DISCLOSED ‌PDF doc# 10942 Addendum #1 to Revised 2020 ContractEffective Date: November 29, 2022 THIS ADDENDUM #1 (the “Addendum”) is effective as of the date above and is entered into by and between: PDF Solutions, Inc.

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

Table of Contents g UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

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): August 8, 2023 PDF SOLUTIONS, INC

Table of Contents 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): August 8, 2023 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Juri

PDF Solutions® Reports Second Quarter 2023 Results

Exhibit 99.1 2858 De La Cruz Boulevard, Santa Clara CA 95050 USA +1.408.280.7900 www.pdf.com News Release Company Contacts: Adnan Raza Sonia Segovia Chief Financial Officer Investor Relations Tel: (408) 516-0237 Tel: (408) 938-6491 Email: [email protected] Email: [email protected] PDF Solutions® Reports Second Quarter 2023 Results Santa Clara, CA, August 8, 2023, – PDF Solutions, Inc. (Nasdaq

PDFS / PDF Solutions Inc. / Cowen Prime Advisors LLC Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* PDF Solutions Inc (Name of Issuer) Common Stock (Title of Class of Securities) 693282105 (CUSIP Number) July 31, 2023 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule i

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

Table of Contents 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 13, 2023 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Juris

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) Delaware 000-31311 25-1701361 (State or other jurisdiction of Incorporation or organization) (Commission file number) (I.R.S. Employer Identification No.) 2858 De La Cruz Blvd Santa Clara, CA 95050 (Address of princ

Conflict Minerals Report as required by Items 1.01 and 1.02 of this Form.

Exhibit 1.01 Conflict Minerals Report of PDF Solutions, Inc. in Accordance with Rule 13p-1 under the Securities Exchange Act of 1934 This is the Conflict Minerals Report of PDF Solutions, Inc. (“PDF Solutions” or the “Company”) for calendar year 2022 in accordance with Rule 13p-1 (“Rule 13p-1”) under the Securities Exchange Act of 1934 (the “1934 Act”). Please refer to Rule 13p-1, Form SD and the

Certification of the principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.†

Exhibit 31.02 CERTIFICATIONS I, Adnan Raza, certify that: 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect

Q1 2023 Management Report May 9, 2023

a Exhibit 99.2 Q1 2023 Management Report May 9, 2023 1 Contents ■ Q1 2023 Results – Overview – Key Financial & Operating Metrics – Revenue by Geographic Area ■ Q1 2023 Non-GAAP Results – Reconciliation of GAAP Net Income (Loss) to Non-GAAP Net Income – Reconciliation of GAAP to Non-GAAP Spending by Function ■ Related Information The following commentary is provided by management and should be refe

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): May 9, 2023 PDF SOLUTIONS, INC. (

Table of Contents 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): May 9, 2023 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Jurisdi

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

Table of Contents g UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.**

Exhibit 32.02 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended March 31, 2023, as filed with the Securities and Exchange Commission on May 9, 2023 (the “Report”), I, Adnan Raza, Executive Vice President, Finance and

PDF Solutions® Reports First Quarter 2023 Results

Exhibit 99.1 2858 De La Cruz Boulevard, Santa Clara CA 95050 USA +1.408.280.7900 www.pdf.com News Release Company Contacts: Adnan Raza Sonia Segovia Chief Financial Officer Investor Relations Tel: (408) 516-0237 Tel: (408) 938-6491 Email: [email protected] Email: [email protected] PDF Solutions® Reports First Quarter 2023 Results Santa Clara, CA, May 9, 2023, – PDF Solutions, Inc. (Nasdaq: PD

Certification of the principal executive officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.†

Exhibit 31.01 CERTIFICATIONS I, John K. Kibarian, certify that: 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with re

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.**

Exhibit 32.01 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended March 31, 2023, as filed with the Securities and Exchange Commission on May 9, 2023 (the “Report”), I, John K. Kibarian, President and Chief Executive Of

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A 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 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 the Commission Only (as permitted by Rule 14a-6(e)(2)) ◻ Definitive Proxy State

“Proposal No. 3: Approval of the Eighth Amended and Restated 2011 Stock Incentive Plan” in the Company’s definitive proxy statement filed with the Securities and Exchange Commission on April 27, 2023 (the “Proxy Statement”)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A 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 the Commission Only (as permitted by Rule 14a-6(e)(2)) þ Defi

Certifications of the principal executive officer and principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002†

EXHIBIT 31.02 CERTIFICATIONS I, Adnan Raza, certify that: 1. I have reviewed this annual report on Form 10-K of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to

Amendment #2 to Amendment #1 to Software License and Related Services Agreement by and between PDF Solutions, Inc. and Advantest America, Inc., signed November 11, 2022, by and between PDF Solutions, Inc. and Advantest America, Inc.

Exhibit 10.13 CERTAIN INFORMATION INDICATED WITH [***] IN THIS DOCUMENT HAS BEEN OMITTED FROM THIS EXHIBIT BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY DISCLOSED PDF doc# 10776 Amendment #2 to Amendment #1 to SLA Effective Date: October 31, 2022 THIS AMENDMENT #2 TO AMENDMENT #1 TO SLA (the “Amendment”) is effective as of the date above and is entered int

Certifications of the principal executive officer and principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002†

EXHIBIT 31.01 CERTIFICATIONS I, John K. Kibarian, certify that: 1. I have reviewed this annual report on Form 10-K of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respe

Subsidiaries of Registrant †

Exhibit 21.01 Subsidiaries of Registrant Name of Entity Jurisdiction of Incorporation or Organization Cimetrix Incorporated Nevada Cimetrix International, Inc. Nevada Cimetrix Japan KK Japan Cimetrix Software (Shanghai) Co., Ltd. China PDF Solutions Asia Services, Inc. Delaware PDF Solutions Canada Ltd. Canada PDF Solutions GmbH Germany PDF Solutions International Services, Inc. Delaware PDF Solut

Consent of BPM LLP, Independent Registered Public Accounting Firm†

Exhibit 23.01 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos. 333-257792, 333-233070, 333-202455, 333-180324, 333-167533, 333-159211, 333-149281, 333-141660, 333-133332, 333-112728, 333-109809, and 333-102509) of PDF Solutions, Inc. of our reports dated March 1, 2023 relating to the consol

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002**

EXHIBIT 32.01 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of PDF Solutions, Inc. (the “Company”) on Form 10-K for the year ended December 31, 2022 as filed with the Securities and Exchange Commission on March 1, 2023 (the “Report”), I, John K. Kibarian, President and Chief Executive Offi

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002**

EXHIBIT 32.02 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of PDF Solutions, Inc. (the “Company”) on Form 10-K for the year ended December 31, 2022 as filed with the Securities and Exchange Commission on March 1, 2023 (the “Report”), I, Adnan Raza, Executive Vice President, Finance and Ch

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 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 000-31311 (Commission file num

Financial Statements and Exhibits, Results of Operations and Financial Condition

Table of Contents 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): February 16, 2023 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other J

Q4 2022 and Full Year 2022 Management Report February 16, 2023

a Exhibit 99.2 Q4 2022 and Full Year 2022 Management Report February 16, 2023 1 Contents ■ Q4 2022 and Full Year 2022 Results – Overview – Key Financial & Operating Metrics – Revenue by Geographic Area ■ Q4 2022 and Full Year 2022 Non-GAAP Results – Reconciliation of GAAP Net Income (Loss) to Non-GAAP Net Income – Reconciliation of GAAP to Non-GAAP Spending by Function ■ Related Information The fo

PDF Solutions® Reports Fourth Quarter and Full Year 2022 Results

Exhibit 99.1 2858 De La Cruz Boulevard, Santa Clara CA 95050 USA +1.408.280.7900 www.pdf.com News Release Company Contacts: Adnan Raza Sonia Segovia Chief Financial Officer Investor Relations Tel: (408) 516-0237 Tel: (408) 938-6491 Email: [email protected] Email: [email protected] PDF Solutions® Reports Fourth Quarter and Full Year 2022 Results Santa Clara, CA, February 16, 2023, – PDF Soluti

PDFS / PDF Solutions, Inc. / KIBARIAN JOHN KACHIG - SC 13G/A Passive Investment

SC 13G/A 1 tmb-20230214xsc13ga.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 18)* PDF SOLUTIONS, INC. (Name of Issuer) COMMON STOCK (Title of Class of Securities) 693282 10 5 (CUSIP Number) DECEMBER 31, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box

PDFS / PDF Solutions, Inc. / 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.: 4)* Name of issuer: PDF Solutions Inc. Title of Class of Securities: Common Stock CUSIP Number: 693282105 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ 

PDFS / PDF Solutions, Inc. / Cowen Prime Advisors LLC Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* PDF Solutions Inc (Name of Issuer) Common Stock (Title of Class of Securities) 693282105 (CUSIP Number) December 31, 2022 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedu

PDFS / PDF Solutions, Inc. / Invesco Ltd. - SEC SCHEDULE 13G Passive Investment

SC 13G/A 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. 4 )* PDF Solutions Inc (Name of Issuer) Common Stock (Title of Class of Securities) 693282105 (CUSIP Number) December 30, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to d

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

Table of Contents g ? 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, Financial Statements and Exhibits, Results of Operations and Financial Condition

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Amendment #1 to Amendment #1 to Software License and Related Services Agreement by and between PDF Solutions, Inc. and Advantest America, Inc., dated June 5, 2022, by and between PDF Solutions, Inc. and Advantest America, Inc.+

? Exhibit 10.01 CERTAIN INFORMATION INDICATED WITH [***] IN THIS DOCUMENT HAS BEEN OMITTED FROM THIS EXHIBIT BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY DISCLOSED PDF doc #10285 ? ? Amendment #1 to Amendment #1 to SLA ? ? THIS AMENDMENT #1 TO AMENDMENT #1 TO SLA (the ?Amendment?) is effective as of the date of the last signature hereon (the ?Effective Da

PDF Solutions® Reports Third Quarter 2022 Results

Exhibit 99.1 ? 2858 De La Cruz Boulevard, Santa Clara CA 95050 USA +1.408.280.7900 www.pdf.com ? News Release ? Company Contacts: Adnan Raza ? Sonia Segovia Chief Financial Officer ? Investor Relations Tel: (408) 516-0237 ? Tel: (408) 938-6491 Email: [email protected] ? Email: [email protected] ? ? PDF Solutions? Reports Third Quarter 2022 Results Santa Clara, CA, November 10, 2022, ? PDF Sol

Q3 2022 Management Report November 10, 2022

a ? ? ? Exhibit 99.2 ? ? ? ? Q3 2022 Management Report November 10, 2022 ? ? 1 ? ? ? ? Contents ? ? ? Q3 2022 Results ? Overview ? Key Financial & Operating Metrics ? Revenue by Geographic Area ? Q3 2022 Non-GAAP Results ? Reconciliation of GAAP Net Income (Loss) to Non-GAAP Net Income ? Reconciliation of GAAP to Non-GAAP Spending by Function ? Related Information The following commentary is provi

PDF Solutions® Reports Second Quarter 2022 Results

Exhibit 99.1 ? 2858 De La Cruz Boulevard, Santa Clara CA 95050 USA +1.408.280.7900 www.pdf.com ? News Release ? Company Contacts: Adnan Raza ? Sonia Segovia Chief Financial Officer ? Investor Relations Tel: (408) 516-0237 ? Tel: (408) 938-6491 Email: [email protected] ? Email: [email protected] ? ? PDF Solutions? Reports Second Quarter 2022 Results Business & Other Highlights ? Record total r

Q2 2022 Management Report August 11, 2022

a ? ? ? Exhibit 99.2 ? ? ? ? Q2 2022 Management Report August 11, 2022 ? ? 1 ? ? ? ? Contents ? ? ? Q2 2022 Results ? Overview ? Key Financial & Operating Metrics ? Revenue by Geographic Area ? Q2 2022 Non-GAAP Results ? Reconciliation of GAAP to Non-GAAP Net Income (Loss) ? Reconciliation of GAAP to Non-GAAP Spending by Function ? Related Information The following commentary is provided by manage

Financial Statements and Exhibits, Results of Operations and Financial Condition

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

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

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, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Conflict Minerals Report as required by Items 1.01 and 1.02 of this Form.

Exhibit 1.01 Conflict Minerals Report of PDF Solutions, Inc. in Accordance with Rule 13p-1 under the Securities Exchange Act of 1934 This is the Conflict Minerals Report of PDF Solutions, Inc. (?PDF Solutions? or the ?Company?) for calendar year 2021 in accordance with Rule 13p-1 (?Rule 13p-1?) under the Securities Exchange Act of 1934 (the ?1934 Act?). Please refer to Rule 13p-1, Form SD and the

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) ? Delaware 000-31311 25-1701361 (State or other jurisdiction of Incorporation or organization) (Commission file number) (I.R.S. Employer Identification No.) ? 2858 De La Cruz Blvd Santa Clara, CA ? 95050 (Address of

Financial Statements and Exhibits, Results of Operations and Financial Condition

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

PDF Solutions® Reports First Quarter 2022 Results

Exhibit 99.1 ? 2858 De La Cruz Boulevard, Santa Clara CA 95050 USA +1.408.280.7900 www.pdf.com ? News Release ? Company Contacts: Adnan Raza Sonia Segovia Joe Diaz, Robert Blum, Joe Dorame Chief Financial Officer Investor Relations Lytham Partners, LLC Tel: (408) 516-0237 Tel: (408) 938-6491 Tel: (602) 889-9700 Email: [email protected] Email: [email protected] Email: [email protected] ?

Q1 2022 Management Report May 12, 2022

a ? ? ? Exhibit 99.2 ? ? ? ? Q1 2022 Management Report May 12, 2022 ? ? 1 ? ? ? ? Contents ? ? ? Q1 2022 Results ? Overview ? Key Financial & Operating Metrics ? Revenue by Geographic Area ? Q1 2022 Non-GAAP Results ? Reconciliation of GAAP to Non-GAAP Net Income (Loss) ? Reconciliation of GAAP to Non-GAAP Spending by Function ? Related Information The following commentary is provided by managemen

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

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

PDF Solutions, Inc.’s Seventh Amended and Restated 2011 Stock Incentive Plan, (incorporated by reference to Appendix A to the Registrant’s Proxy Statement filed on April 27, 2022).

Table of Contents ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

? Exhibit 4.03 ? DESCRIPTION OF THE REGISTRANT?S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 PDF Solutions, Inc. (?we,? ?our,? ?us,? or the ?Company?) has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended: our common stock. The following summary of the terms of our common stock is based upon our Third Amen

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

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Subsidiaries of Registrant †

Exhibit 21.01 ? Subsidiaries of Registrant ? Name of Entity Jurisdiction of Incorporation or Organization Cimetrix Incorporated Nevada Cimetrix International, Inc. Nevada Cimetrix Japan KK Japan Cimetrix Software (Shanghai) Co., Ltd. China PDF Solutions Asia Services, Inc. Delaware PDF Solutions Canada Ltd. Canada PDF Solutions GmbH Germany PDF Solutions International Services, Inc. Delaware PDF S

Financial Statements and Exhibits, Results of Operations and Financial Condition

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

PDF Solutions® Reports Fourth Quarter and Full Year 2021 Results

Exhibit 99.1 ? 2858 De La Cruz Boulevard, Santa Clara CA 95050 USA +1.408.280.7900 www.pdf.com ? News Release ? Company Contacts: Adnan Raza Sonia Segovia Joe Diaz, Robert Blum, Joe Dorame Chief Financial Officer Investor Relations Lytham Partners, LLC Tel: (408) 516-0237 Tel: (408) 938-6491 Tel: (602) 889-9700 Email: [email protected] Email: [email protected] Email: [email protected] ?

Q4 2021 and Full Year 2021 Management Report February 15, 2022

a ? ? ? Exhibit 99.2 ? ? ? ? Q4 2021 and Full Year 2021 Management Report February 15, 2022 ? ? 1 ? ? ? ? Contents ? ? ? Q4 2021 and Full Year 2021 Results ? Overview ? Key Financial & Operating Metrics ? Revenue by Geographic Area ? Q4 2021 and Full Year 2021 Non-GAAP Results ? Reconciliation of GAAP to Non-GAAP Net Income (Loss) ? Reconciliation of GAAP to Non-GAAP Spending by Function ? Related

PDFS / PDF Solutions, Inc. / KIBARIAN JOHN KACHIG - SC 13G/A Passive Investment

? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? SCHEDULE 13G/A ? Under the Securities Exchange Act of 1934 (Amendment No. 17)* ? PDF SOLUTIONS, INC. (Name of Issuer) ? COMMON STOCK (Title of Class of Securities) ? 693282 10 5 (CUSIP Number) ? DECEMBER 31, 2021 (Date of Event Which Requires Filing of this Statement) ? Check the appropriate box to designate the rule pursu

PDFS / PDF Solutions, Inc. / Invesco Ltd. - 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. 3 )* PDF Solutions Inc (Name of Issuer) Common Stock (Title of Class of Securities) 693282105 (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 this Sche

PDFS / PDF Solutions, Inc. / 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.: 3)* Name of issuer: PDF Solutions Inc. Title of Class of Securities: Common Stock CUSIP Number: 693282105 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 filed: ??

PDFS / PDF Solutions, Inc. / Cowen Prime Advisors LLC Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* PDF Solutions Inc (Name of Issuer) Common Stock (Title of Class of Securities) 693282105 (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 this Schedu

Certification of the principal executive officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.†

? Exhibit 31.01 ? ? ? CERTIFICATIONS ? I, John K. Kibarian, certify that: ? 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; ? 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misl

Financial Statements and Exhibits, Results of Operations and Financial Condition

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

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

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.**

Exhibit 32.01 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended September 30, 2021, as filed with the Securities and Exchange Commission on November 9, 2021 (the “Report”), I, John K. Kibarian, President and Chief Exe

Certification of the principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.†

Exhibit 31.02 CERTIFICATIONS I, Adnan Raza, certify that: 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect

PDF Solutions® Reports Third Quarter 2021 Results

Exhibit 99.1 ? 2858 De La Cruz Boulevard, Santa Clara CA 95050 USA +1.408.280.7900 www.pdf.com ? News Release ? Company Contacts: Adnan Raza Sonia Segovia Joe Diaz, Robert Blum, Joe Dorame Chief Financial Officer Investor Relations Lytham Partners, LLC Tel: (408) 516-0237 Tel: (408) 938-6491 Tel: (602) 889-9700 Email: [email protected] Email: [email protected] Email: [email protected] ?

Q3 2021 Management Report November 9, 2021

a ? ? ? Exhibit 99.2 ? ? ? ? Q3 2021 Management Report November 9, 2021 ? ? 1 ? ? ? ? Contents ? ? ? Q3 2021 Results ? Overview ? Key Financial & Operating Metrics ? Revenue by Geographic Area ? Q3 2021 Non-GAAP Results ? Reconciliation of GAAP to Non-GAAP Net Income (Loss) ? Reconciliation of GAAP to Non-GAAP Spending by Function ? Related Information The following commentary is provided by manag

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.**

? Exhibit 32.02 ? ? ? CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 ? In connection with the Quarterly Report of PDF Solutions, Inc. (the ?Company?) on Form 10-Q for the quarter ended September 30, 2021, as filed with the Securities and Exchange Commission on November 9, 2021 (the ?Report?), I, Adnan Raza, Executive Vice Pres

Ye Jane Li Joins PDF Solutions Board of Directors

? News Release ? ? ? Company Contacts: ? David Park Sonia Segovia, VP of Marketing Investor Relations Tel: (408) 533-8530 Tel: (408) 938-6491 Email: david.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Financial Statements and Exhibits, Results of Operations and Financial Condition

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Certification of the principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.†

? Exhibit 31.02 ? ? ? CERTIFICATIONS ? I, Adnan Raza, certify that: ? 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; ? 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading

PDF Solutions® Reports Second Quarter 2021 Results

Exhibit 99.1 ? 2858 De La Cruz Boulevard, Santa Clara CA 95050 USA +1.408.280.7900 www.pdf.com ? News Release ? Company Contacts: Adnan Raza Sonia Segovia Joe Diaz, Robert Blum, Joe Dorame Chief Financial Officer IR Coordinator Lytham Partners, LLC Tel: (408) 516-0237 Tel: (408) 938-6491 Tel: (602) 889-9700 Email: [email protected] Email: [email protected] Email: [email protected] ? PDF

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 000-31311 PDF SOLUTI

Q2 2021 Management Report August 10, 2021

a ? ? ? Exhibit 99.2 ? ? ? ? Q2 2021 Management Report August 10, 2021 ? ? 1 ? ? ? ? Contents ? ? ? Q2 2021 Results ? Overview ? Key Financial & Operating Metrics ? Revenue by Geographic Area ? Q2 2021 Non-GAAP Results ? Reconciliation of GAAP to Non-GAAP Net Income (Loss) ? Reconciliation of GAAP to Non-GAAP Spending by Function ? Related Information The following commentary is provided by manage

Certification of the principal executive officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.†

? Exhibit 31.01 ? ? ? CERTIFICATIONS ? I, John K. Kibarian, certify that: ? 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; ? 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misl

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.**

Exhibit 32.01 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended June 30, 2021, as filed with the Securities and Exchange Commission on August 10, 2021 (the “Report”), I, John K. Kibarian, President and Chief Executive

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.**

Exhibit 32.02 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended June 30, 2021, as filed with the Securities and Exchange Commission on August 10, 2021 (the “Report”), I, Adnan Raza, Executive Vice President, Finance a

As filed with the Securities and Exchange Commission on July 9, 2021

As filed with the Securities and Exchange Commission on July 9, 2021 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

Table of Conents 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 21, 2021 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Jurisd

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): June 15, 2021 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Jurisdiction of Incorpo

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(A) of the Securities Exchange Act of 1934

DEFA14A 1 pdfs20210615defa14a.htm FORM DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A 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 the Commission Only (as permitte

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter)

SD 1 pdfs20210521sd.htm FORM SD UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) Delaware 000-31311 25-1701361 (State or other jurisdiction of Incorporation or organization) (Commission file number) (I.R.S. Employer Identification No.) 2858 De La Cruz Blvd Santa C

Conflict Minerals Report as required by Items 1.01 and 1.02 of this Form.

EX-1.01 2 ex252450.htm EXHIBIT 1.01 Exhibit 1.01 Conflict Minerals Report of PDF Solutions, Inc. in Accordance with Rule 13p-1 under the Securities Exchange Act of 1934 This is the Conflict Minerals Report of PDF Solutions, Inc. (“PDF Solutions” or the “Company”) for calendar year 2020 in accordance with Rule 13p-1 (“Rule 13p-1”) under the Securities Exchange Act of 1934 (the “1934 Act”). Please r

Management Report by PDF Solutions, Inc. as of May 6, 2021.

Exhibit 99.2

Certification of the principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.†

Exhibit 31.02 CERTIFICATIONS I, Adnan Raza, certify that: 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect

Quarterly Report - FORM 10-Q

Table of Contents 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 000-31311 PDF

PDF Solutions® Reports First Quarter 2021 Results

Exhibit 99.1 2858 De La Cruz Boulevard, Santa Clara CA 95050 USA +1.408.280.7900 www.pdf.com News Release Company Contacts: Adnan Raza Sonia Segovia Joe Diaz, Robert Blum, Joe Dorame Chief Financial Officer IR Coordinator Lytham Partners, LLC Tel: (408) 516-0237 Tel: (408) 938-6491 Tel: (602) 889-9700 Email: [email protected] Email: [email protected] Email: [email protected] PDF Solutio

Financial Statements and Exhibits, Results of Operations and Financial Condition

Table of Contents 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): May 6, 2021 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Jurisdi

Certification of the principal executive officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.†

Exhibit 31.01 CERTIFICATIONS I, John K. Kibarian, certify that: 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with re

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.**

Exhibit 32.01 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended March 31, 2021, as filed with the Securities and Exchange Commission on May 6, 2021 (the “Report”), I, John K. Kibarian, President and Chief Executive Of

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.**

Exhibit 32.02 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended March 31, 2021, as filed with the Securities and Exchange Commission on May 6, 2021 (the “Report”), I, Adnan Raza, Executive Vice President, Finance and

2021 Employee Stock Purchase Plan (incorporated by reference to Appendix A to Registrant’s Definitive Proxy Statement on Schedule 14A filed April 28, 2021).

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A 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 the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defi

Subsidiaries of Registrant †

Exhibit 21.01 Subsidiaries of Registrant Name of Entity Jurisdiction of Incorporation or Organization Cimetrix GmbH Germany Cimetrix Incorporated Nevada Cimetrix International, Inc. Nevada Cimetrix Japan KK Japan Cimetrix Software (Shanghai) Co., Ltd. China PDF Solutions Asia Services, Inc. Delaware PDF Solutions Canada Ltd. Canada PDF Solutions GmbH Germany PDF Solutions International Services, I

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002**

EXHIBIT 32.01 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of PDF Solutions, Inc. (the “Company”) on Form 10-K for the year ended December 31, 2020 as filed with the Securities and Exchange Commission on March 11, 2021 (the “Report”), I, John K. Kibarian, President and Chief Executive Off

Certifications of the principal executive officer and principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002†

EXHIBIT 31.02 CERTIFICATIONS I, Adnan Raza, certify that: 1. I have reviewed this annual report on Form 10-K of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to

Certifications of the principal executive officer and principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002†

EXHIBIT 31.01 CERTIFICATIONS I, John K. Kibarian, certify that: 1. I have reviewed this annual report on Form 10-K of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respe

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002**

EXHIBIT 32.02 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of PDF Solutions, Inc. (the “Company”) on Form 10-K for the year ended December 31, 2020 as filed with the Securities and Exchange Commission on March 11, 2021 (the “Report”), I, Adnan Raza, Executive Vice President, Finance and C

Consent of BPM LLP, Independent Registered Public Accounting Firm†

Exhibit 23.01 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference and in the Registration Statements on Form S-8 (Nos. 333-233070, 333-202455, 333-180324, 333-167533, 333-159211, 333-149281, 333-141660, 333-133332, 333-112728, 333-109809, and 333-102509) of PDF Solutions, Inc. of our reports dated March 11, 2021 relating to the consolidated

Annual Report - FORM 10-K

? Table of Contents?? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

PDF Solutions® Reports Fourth Quarter and Full Year 2020 Results

Exhibit 99.1 News Release Company Contacts: Adnan Raza Sonia Segovia Joe Diaz, Robert Blum, Joe Dorame Chief Financial Officer IR Coordinator Lytham Partners, LLC Tel: (408) 516-0237 Tel: (408) 938-6491 Tel: (602) 889-9700 Email: [email protected] Email: [email protected] Email: [email protected] PDF Solutions? Reports Fourth Quarter and Full Year 2020 Results Business Highlights ? Tota

Management Report by PDF Solutions, Inc. as of February 18, 2021.

Exhibit 99.2

Financial Statements and Exhibits, Results of Operations and Financial Condition

Table of Contents 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): February 18, 2021 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other J

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 16)* PDF SOLUTIONS, INC. (Name of Issuer) COMMON STOCK (Title of Class of Securities) (CUSIP Number) DECEM

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 16)* PDF SOLUTIONS, INC. (Name of Issuer) COMMON STOCK (Title of Class of Securities) 693282 10 5 (CUSIP Number) DECEMBER 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which thi

SCHEDULE 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2 )* PDF Solutions Inc (Name of Issuer) Common Stock (Title of Class of Securities) 693282105 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Sche

SCHEDULE 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2 )* PDF Solutions Inc (Name of Issuer) Common Stock (Title of Class of Securities) 693282105 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Sche

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 2)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 2)* Name of issuer: PDF Solutions Inc. Title of Class of Securities: Common Stock CUSIP Number: 693282105 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 filed: ☒ 

Financial Statements and Exhibits, Other Events - FORM 8-K

Table of Contents 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 1, 2020 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Ju

PDF Solutions

Exhibit 99.1 PDF Solutions Completes Acquisition of Cimetrix Santa Clara, Calif. – December 1, 2020 - PDF Solutions, Inc. (NASDAQ: PDFS), today announced it has officially closed the acquisition of Cimetrix Incorporated, a leading global provider of equipment connectivity products for smart manufacturing and Industry 4.0. The combination of Cimetrix® connectivity products and platforms with PDF So

Investor Presentation, dated November 17, 2020.

Exhibit 99.2

PDF Solutions to Acquire Smart Manufacturing and Factory Connectivity Expert Cimetrix Acquisition Provides Potential of Unrivaled Intelligence for Semiconductor, Packaging, and Electronics Manufacturing

Exhibit 99.1 PDF Solutions to Acquire Smart Manufacturing and Factory Connectivity Expert Cimetrix Acquisition Provides Potential of Unrivaled Intelligence for Semiconductor, Packaging, and Electronics Manufacturing Santa Clara, Calif. — November 17, 2020 — PDF Solutions, Inc. (NASDAQ: PDFS) today announced it has entered into a definitive agreement to acquire Cimetrix Incorporated. The combinatio

Financial Statements and Exhibits, Other Events - FORM 8-K

Table of Contents 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 16, 2020 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other J

Certification of the principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.†

Exhibit 31.02 CERTIFICATIONS I, Adnan Raza, certify that: 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect

Securities Purchase Agreement by and between PDF Solutions, Inc. and Advantest America, Inc. dated July 29, 2020 (incorporated herein by reference to registrant’s Quarterly Report on Form 10-Q filed November 6, 2020)+.

Exhibit 4.1 SECURITIES PURCHASE AGREEMENT by and between PDF SOLUTIONS, INC. and ADVANTEST AMERICA, INC. July 29, 2020 Table of Contents Page 1. Definitions 1 2. Authorization, Purchase and Sale of the Securities 4 2.1 Authorization, Purchase and Sale 4 2.2 Closing 5 3. Representations and Warranties of the Company 5 3.1 Organization and Power 5 3.2 Authorization 5 3.3 The Subject Shares 5 3.4 Cap

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.**

Exhibit 32.02 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended September 30, 2020, as filed with the Securities and Exchange Commission on November 6, 2020 (the “Report”), I, Adnan Raza, Executive Vice President, Fin

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.**

Exhibit 32.01 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended September 30, 2020, as filed with the Securities and Exchange Commission on November 6, 2020 (the “Report”), I, John K. Kibarian, President and Chief Exe

Certification of the principal executive officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.†

Exhibit 31.01 CERTIFICATIONS I, John K. Kibarian, certify that: 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with re

Quarterly Report - FORM 10-Q

Table of Contents 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 000-313

Stockholder Agreement by and between PDF Solutions, Inc. and Advantest America, Inc. dated July 29, 2020 (incorporated herein by reference to registrant’s Quarterly Report on Form 10-Q filed November 6, 2020)

EX-4.2 3 ex211192.htm EXHIBIT 4.2 Exhibit 4.2 STOCKHOLDER AGREEMENT by and between PDF SOLUTIONS, INC. and ADVANTEST AMERICA, INC. Dated as of July 30, 2020 STOCKHOLDER AGREEMENT This STOCKHOLDER AGREEMENT (this “Agreement”) is dated as of July 30, 2020, by and between PDF Solutions, Inc., a Delaware corporation (the “Company”), and Advantest America, Inc., a Delaware corporation (the “Stockholder

Software License and Related Services Agreement by and between PDF Solutions, Inc. and Advantest America, Inc. dated March 25, 2020 and Amendment No.1 thereto dated July 29, 2020 (incorporated herein by reference to registrant’s Quarterly Report on Form 10-Q filed November 6, 2020)+

Exhibit 10.1 Certain information indicated with [***] in this document has been omitted from this exhibit because it is both (i) not material and (ii) would be competitively harmful if publicly disclosed PDF doc # 8116 Effective Date: March 25, 2020 This Software License & Related Services AGREEMENT (the “SLA” or “this Agreement”) is effective as of the date above and is entered into by and betwee

Master Commercial Terms and Support Services Agreement by and between PDF Solutions, Inc. and Advantest America, Inc. dated July 29, 2020 (incorporated herein by reference to registrant’s Quarterly Report on Form 10-Q filed November 6, 2020)+

Exhibit 10.3 CERTAIN INFORMATION INDICATED WITH [***] IN THIS DOCUMENT HAS BEEN OMITTED FROM THIS EXHIBIT BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY DISCLOSED PDF doc #8277 MASTER COMMERCIAL TERMS AND SUPPORT SERVICES AGREEMENT This Master Commercial Terms and Support Services Agreement (this “Agreement”), is effective as of July 29, 2020 (the “Effectiv

Amended and Restated Master Development Agreement by and between PDF Solutions, Inc. and Advantest America, Inc. dated July 29, 2020 (incorporated herein by reference to registrant’s Quarterly Report on Form 10-Q filed November 6, 2020)+

Exhibit 10.2 Certain information indicated with [***] in this document has been omitted from this exhibit because it is both (i) not material and (ii) would be competitively harmful if publicly disclosed PDF doc #8437 AMENDED AND RESTATED MASTER DEVELOPMENT AGREEMENT THIS AMENDED AND RESTATED MASTER DEVELOPMENT AGREEMENT (this “Agreement”), effective as of July 06, 2020 (the “Effective Date”), is

Management Report by PDF Solutions, Inc. as of November 5, 2020.

Exhibit 99.2

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

Table of Contents 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 5, 2020 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Ju

PDF Solutions® Reports Third Quarter 2020 Results

Exhibit 99.1 News Release Company Contacts: Adnan Raza Sonia Segovia Joe Diaz, Robert Blum, Joe Dorame Chief Financial Officer IR Coordinator Lytham Partners, LLC Tel: (408) 516-0237 Tel: (408) 938-6491 Tel: (602) 889-9700 Email: [email protected] Email: [email protected] Email: [email protected] PDF Solutions® Reports Third Quarter 2020 Results Business Highlights ● Total revenues of $

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.**

Exhibit 32.02 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended June 30, 2020, as filed with the Securities and Exchange Commission on August 6, 2020 (the “Report”), I, Adnan Raza, Executive Vice President, Finance an

JOINT FILING AGREEMENT

Exhibit A JOINT FILING AGREEMENT The undersigned hereby agree that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, and that all subsequent amendments to this statement on Schedule 13G may be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements.

Quarterly Report - FORM 10-Q

Table of Contents 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 000-31311 PD

PDFS / PDF Solutions, Inc. / ADVANTEST CORP Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* PDF Solutions, Inc. (Name of Issuer) Common Stock, par value $0.00015 per share (Title of Class of Securities) 693282105 (CUSIP Number) July 30, 2020 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule p

PDF Solutions® Reports Second Quarter 2020 Results

Exhibit 99.1 News Release Company Contacts: Adnan Raza Sonia Segovia Joe Diaz, Robert Blum, Joe Dorame Chief Financial Officer IR Coordinator Lytham Partners, LLC Tel: (408) 516-0237 Tel: (408) 938-6491 Tel: (602) 889-9700 Email: [email protected] Email: [email protected] Email: [email protected] PDF Solutions® Reports Second Quarter 2020 Results Business Highlights ● Total revenues of

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.**

Exhibit 32.01 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended June 30, 2020, as filed with the Securities and Exchange Commission on August 6, 2020 (the “Report”), I, John K. Kibarian, President and Chief Executive

Certification of the principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.†

Exhibit 31.02 CERTIFICATIONS I, Adnan Raza, certify that: 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect

Certification of the principal executive officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.†

Exhibit 31.01 CERTIFICATIONS I, John K. Kibarian, certify that: 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with re

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): August 6, 2020 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Jurisdiction of Incorp

Management Report by PDF Solutions, Inc. as of August 6, 2020.

Exhibit 99.2

Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, 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): July 29, 2020 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 000-31311 (Commission

Advantest and PDF Solutions Announce Partnership to Build Advantest Cloud Powered by Exensio Advantest Becomes a Significant Stockholder in PDF Solutions in Private Placement

EX-99.1 2 ex196293.htm EXHIBIT 99.1 Exhibit 99.1 News Release PDF Company Contacts: Kimon Michaels Sonia Segovia Joe Diaz, Robert Blum, Joe Dorame EVP, Products & Solutions IR Coordinator Lytham Partners, LLC Tel: (408) 938-6408 Tel: (408) 938-6491 Tel: (602) 889-9700 Email: [email protected] Email: [email protected] Email: [email protected] Advantest and PDF Solutions Announce Part

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

Table of Contents 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 23, 2020 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Juris

- FORM DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A 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 the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy State

Current Report

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 12, 2020 PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) 000-31311 (Commission File Number) Delaware 25-1701361 (State or Other Jurisdiction of Incorpo

PDFS / PDF Solutions, Inc. / Invesco Ltd. - 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 )* PDF Solutions Inc (Name of Issuer) Common Stock (Title of Class of Securities) 693282105 (CUSIP Number) May 29, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule

Certifications of the principal executive officer and principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002†

EXHIBIT 31.01 CERTIFICATIONS I, John K. Kibarian, certify that: 1. I have reviewed this Amendment No. 1 to the annual report on Form 10-K of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, no

Certifications of the principal executive officer and principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002†

EXHIBIT 31.02 CERTIFICATIONS I, Adnan Raza, certify that: 1. I have reviewed this Amendment No. 1 to the annual report on Form 10-K of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misl

Annual Report - FORM 10-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K/A (Amendment No. 1) (Mark One) ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 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 000-31311 (Commission file n

PDFS / PDF Solutions, Inc. / Cowen Prime Services LLC - 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. )* PDF Solutions Inc (Name of Issuer) Common Stock (Title of Class of Securities) 693282105 (CUSIP Number) June 3, 2020 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is

Conflict Minerals Report as required by Items 1.01 and 1.02 of this Form.

EX-1.01 2 ex188303.htm EXHIBIT 1.01 Exhibit 1.01 Conflict Minerals Report of PDF Solutions, Inc. in Accordance with Rule 13p-1 under the Securities Exchange Act of 1934 This is the Conflict Minerals Report of PDF Solutions, Inc. (“PDF Solutions” or the “Company”) for calendar year 2019 in accordance with Rule 13p-1 (“Rule 13p-1”) under the Securities Exchange Act of 1934 (the “1934 Act”). Please r

- FORM SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT PDF SOLUTIONS, INC. (Exact name of registrant as specified in its charter) Delaware 000-31311 25-1701361 (State or other jurisdiction of Incorporation or organization) (Commission file number) (I.R.S. Employer Identification No.) 2858 De La Cruz Blvd Santa Clara, CA 95050 (Address of princ

Pay for Performance Compensation Program

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

- FORM DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A 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 the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy State

PDF Solutions® Reports First Quarter 2020 Results

EX-99.1 2 ex185205.htm EXHIBIT 99.1 Exhibit 99.1 News Release Company Contacts: Adnan Raza Sonia Segovia Joe Diaz, Robert Blum, Joe Dorame Chief Financial Officer IR Coordinator Lytham Partners, LLC Tel: (408) 516-0237 Tel: (408) 938-6491 Tel: (602) 889-9700 Email: [email protected] Email: [email protected] Email: [email protected] PDF Solutions® Reports First Quarter 2020 Results Busin

Certification of the principal executive officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.†

Exhibit 31.01 CERTIFICATIONS I, John K. Kibarian, certify that: 1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with re

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.**

Exhibit 32.02 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended March 31, 2020 as filed with the Securities and Exchange Commission on May 7, 2020 (the “Report”), I, Adnan Raza, Executive Vice President, Finance and C

Management Report by PDF Solutions, Inc. as of May 7, 2020.

EX-99.2 3 ex185206.htm EXHIBIT 99.2 Exhibit 99.2

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.**

Exhibit 32.01 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended March 31, 2020, as filed with the Securities and Exchange Commission on May 7, 2020 (the “Report”), I, John K. Kibarian, President and Chief Executive Of