American Tower Corporation
MX ˙ BMV ˙ US03027X1000
SecurityMX:AMT / American Tower Corporation
InstitutionAltman Advisors, Inc.
Latest Disclosed Ownership7,817 shares
Latest Disclosed Value $ 1,349,113
Altman Advisors, Inc. reports 9.12% increase in ownership of AMT / American Tower Corporation

On May 5, 2026 - Altman Advisors, Inc. filed a 13F-HR form disclosing ownership of 7,817 shares of American Tower Corporation (MX:AMT) valued at $1,349,113 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 4, 2026 disclosing 7,164 shares of American Tower Corporation. This represents a change in shares of 9.12% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-05 2026-03-31 13F AMERICAN TOWER COM 03027X100 7,817 653 9.12 1,349 7.32 0.5592
2026-02-04 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 7,164 -1,186 -14.20 1,258 -21.68 0.4740
2025-11-13 2025-09-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 8,350 70 0.85 1,606 -13.62 0.6144
2025-11-07 2025-09-30 13F AMERICAN TOWER CORP COM 03027X100 8,280 0 1,859 0.7606
2025-08-07 2025-06-30 13F AMERICAN TOWER CORP COM 03027X100 8,280 186 2.30 1,859 1.86 0.7592
2025-05-02 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 8,094 252 3.21 1,824 26.84 0.8407
2025-02-13 2024-12-31 13F AMERICAN TOWER CORP COM 03027X100 7,842 186 2.43 1,438 -19.21 0.6132
2024-11-08 2024-09-30 13F AMERICAN TOWER CORP COM 03027X100 7,656 7,656 1,780 0.7921
2024-08-08 2024-06-30 13F AMERICAN TOWER CORP COM 03027X100 0 -7,505 -100.00 0 -100.00
2024-05-09 2024-03-31 13F AMERICAN TOWER CORP COM 03027X100 7,505 1,230 19.60 1,449 6.94 0.7050
2024-02-08 2023-12-31 13F AMERICAN TOWER CORP COM 03027X100 6,275 -777 -11.02 1,355 16.82 0.7103
2023-11-14 2023-09-30 13F AMERICAN TOWER CORP COM 03027X100 7,052 7,052 1,160 0.7238
2023-05-09 2023-03-31 13F AMERICAN TOWER CORP COM 03027X100 0 -5,718 -100.00 0 -100.00
2023-02-08 2022-12-31 13F AMERICAN TOWER CORP COM 03027X100 5,718 -129 -2.21 1,304 3.90 0.8049
2022-11-08 2022-09-30 13F AMERICAN TOWER CORP COM 03027X100 5,847 78 1.35 1,255 -18.40 0.7923
2022-08-08 2022-06-30 13F AMERICAN TOWER CORP COM 03027X100 5,769 -18 -0.31 1,538 5.78 0.8763
2022-05-09 2022-03-31 13F AMERICAN TOWER CORP COM 03027X100 5,787 -3,068 -34.65 1,454 -32.90 0.7507
2022-02-08 2021-12-31 13F AMERICAN TOWER CORP COM 03027X100 8,855 61 0.69 2,167 -12.62 1.3225
2021-11-09 2021-09-30 13F AMERICAN TOWER CORP COM 03027X100 8,794 14 0.16 2,480 0.85 1.3726
2021-08-13 2021-06-30 13F AMERICAN TOWER CORP COM 03027X100 8,780 500 6.04 2,459 24.32 1.3887
2021-05-14 2021-03-31 13F AMERICAN TOWER CORP COM 03027X100 8,280 -2,822 -25.42 1,978 -20.63 1.2766
2021-02-10 2020-12-31 13F AMERICAN TOWER CORP COM 03027X100 11,102 1,645 17.39 2,492 9.01 1.5644
2020-11-13 2020-09-30 13F AMERICAN TOWER CORP COM 03027X100 9,457 147 1.58 2,286 -5.03 1.6197
2020-08-12 2020-06-30 13F AMERICAN TOWER CORP COM 03027X100 9,310 25 0.27 2,407 19.04 2.0461
2020-04-20 2020-03-31 13F AMERICAN TOWER CORP COM 03027X100 9,285 -511 -5.22 2,022 -10.17 1.8777
2020-01-17 2019-12-31 13F AMERICAN TOWER CORP COM 03027X100 9,796 -91 -0.92 2,251 2.97 1.7986
2019-10-09 2019-09-30 13F AMERICAN TOWER CORP COM 03027X100 9,887 -73 -0.73 2,186 7.37 1.8501
2019-07-12 2019-06-30 13F AMERICAN TOWER CORP COM 03027X100 9,960 144 1.47 2,036 5.27 1.7106
2019-04-12 2019-03-31 13F AMERICAN TOWER CORP COM 03027X100 9,816 -4,432 -31.11 1,934 -14.20 1.8147
2019-02-07 2018-12-31 13F AMERICAN TOWER CORP COM 03027X100 14,248 -2,854 -16.69 2,254 -9.30 2.4710
2018-11-13 2018-09-30 13F AMERICAN TOWER CORP COM 03027X100 17,102 14,982 706.70 2,485 -31.05 2.2346
2018-08-01 2018-06-30 13F AMERICAN TOWER CORP COM 03027X100 2,120 -14,653 -87.36 3,604 47.83 3.3095
2018-04-27 2018-03-31 13F AMERICAN TOWER CORP COM 03027X100 16,773 245 1.48 2,438 3.39 2.3358
2018-02-15 2017-12-31 13F AMERICAN TOWER CORP COM 03027X100 16,528 16,528 2,358 2.0506
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.