American Tower Corporation
US ˙ NYSE ˙ US03027X1000

SecurityAMT / American Tower Corporation
InstitutionBarr E S & Co
Latest Disclosed Ownership157,042 shares
Latest Disclosed Value $ 27,102,303
Barr E S & Co reports 10.29% decrease in ownership of AMT / American Tower Corporation

On May 13, 2026 - Barr E S & Co filed a 13F-HR form disclosing ownership of 157,042 shares of American Tower Corporation (US:AMT) valued at $27,102,308 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 175,052 shares of American Tower Corporation. This represents a change in shares of -10.29% during the quarter. The current value of the position is $30,452,014 USD.

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)
2026-05-13 2026-03-31 13F AMERICAN TOWER COM 03027X100 157,042 -18,010 -10.29 27,102 -11.81 1.5765
2026-02-05 2025-12-31 13F AMERICAN TOWER COM 03027X100 175,052 -1,442 -0.82 30,734 -9.46 1.5997
2025-11-12 2025-09-30 13F AMERICAN TOWER COM 03027X100 176,494 -1,584 -0.89 33,943 -13.76 1.8401
2025-08-12 2025-06-30 13F AMERICAN TOWER COM 03027X100 178,078 -524 -0.29 39,359 1.27 2.2564
2025-05-15 2025-03-31 13F AMERICAN TOWER COM 03027X100 178,602 6,752 3.93 38,864 23.30 2.3597
2025-02-13 2024-12-31 13F AMERICAN TOWER COM 03027X100 171,850 4,419 2.64 31,519 -19.05 1.8644
2024-11-14 2024-09-30 13F AMERICAN TOWER COM 03027X100 167,431 2,239 1.36 38,938 21.26 2.4298
2024-08-14 2024-06-30 13F AMERICAN TOWER COM 03027X100 165,192 5,710 3.58 32,110 1.90 2.1068
2024-05-15 2024-03-31 13F AMERICAN TOWER COM 03027X100 159,482 4,602 2.97 31,512 -5.75 2.0538
2024-02-09 2023-12-31 13F AMERICAN TOWER COM 03027X100 154,880 -6,897 -4.26 33,435 25.68 2.2699
2023-11-14 2023-09-30 13F AMERICAN TOWER COM 03027X100 161,777 21,392 15.24 26,604 -2.28 1.9255
2023-08-10 2023-06-30 13F AMERICAN TOWER COM 03027X100 140,385 10,405 8.01 27,226 2.51 2.0539
2023-05-15 2023-03-31 13F AMERICAN TOWER COM 03027X100 129,980 13,316 11.41 26,560 7.46 2.1997
2023-02-14 2022-12-31 13F AMERICAN TOWER COM 03027X100 116,664 9,440 8.80 24,716 7.36 2.0517
2022-11-14 2022-09-30 13F AMERICAN TOWER COM 03027X100 107,224 2,124 2.02 23,021 -14.30 2.0373
2022-08-15 2022-06-30 13F AMERICAN TOWER COM 03027X100 105,100 732 0.70 26,863 2.46 2.1907
2022-05-16 2022-03-31 13F AMERICAN TOWER COM 03027X100 104,368 10,435 11.11 26,219 -4.57 1.7944
2022-02-14 2021-12-31 13F AMERICAN TOWER COM 03027X100 93,933 -1,298 -1.36 27,475 8.70 1.8321
2021-11-10 2021-09-30 13F AMERICAN TOWER COM 03027X100 95,231 -1,018 -1.06 25,275 -2.79 1.8201
2021-08-13 2021-06-30 13F AMERICAN TOWER COM 03027X100 96,249 -264 -0.27 26,001 12.70 1.8734
2021-05-14 2021-03-31 13F AMERICAN TOWER COM 03027X100 96,513 2,392 2.54 23,072 9.21 1.8092
2021-02-16 2020-12-31 13F AMERICAN TOWER COM 03027X100 94,121 12,597 15.45 21,126 7.20 1.8359
2020-11-13 2020-09-30 13F AMERICAN TOWER COM 03027X100 81,524 -1,336 -1.61 19,707 -8.01 1.9462
2020-08-14 2020-06-30 13F AMERICAN TOWER COM 03027X100 82,860 -270 -0.32 21,423 18.35 2.2051
2020-05-15 2020-03-31 13F AMERICAN TOWER COM 03027X100 83,130 61,662 287.23 18,102 266.88 2.0862
2020-02-14 2019-12-31 13F AMERICAN TOWER COM 03027X100 21,468 -1,100 -4.87 4,934 -1.12 0.4750
2019-11-12 2019-09-30 13F AMERICAN TOWER COM 03027X100 22,568 -275 -1.20 4,990 6.85 0.4930
2019-08-08 2019-06-30 13F AMERICAN TOWER COM 03027X100 22,843 -125 -0.54 4,670 3.18 0.4593
2019-05-15 2019-03-31 13F AMERICAN TOWER COM 03027X100 22,968 -200 -0.86 4,526 23.49 0.4689
2019-02-14 2018-12-31 13F AMERICAN TOWER COM 03027X100 23,168 -775 -3.24 3,665 5.35 0.4087
2018-11-07 2018-09-30 13F AMERICAN TOWER COM 03027X100 23,943 -491 -2.01 3,479 -1.25 0.3423
2018-08-10 2018-06-30 13F AMERICAN TOWER COM 03027X100 24,434 125 0.51 3,523 -0.28 0.3639
2018-05-15 2018-03-31 13F AMERICAN TOWER COM 03027X100 24,309 0 0.00 3,533 1.87 0.3707
2018-02-14 2017-12-31 13F AMERICAN TOWER COM 03027X100 24,309 0 0.00 3,468 4.36 0.3522
2017-11-09 2017-09-30 13F AMERICAN TOWER COM 03027X100 24,309 0 0.00 3,323 3.29 0.3537
2017-08-14 2017-06-30 13F AMERICAN TOWER COM 03027X100 24,309 0 0.00 3,217 8.87 0.3581
2017-05-15 2017-03-31 13F AMERICAN TOWER COM 03027X100 24,309 0 0.00 2,955 15.03 0.3370
2017-02-14 2016-12-31 13F AMERICAN TOWER COM 03027X100 24,309 0 0.00 2,569 -6.75 0.3019
2016-11-10 2016-09-30 13F AMERICAN TOWER COM 03027X100 24,309 0 0.00 2,755 -0.25 0.3388
2016-08-12 2016-06-30 13F AMERICAN TOWER COM 03027X100 24,309 0 0.00 2,762 10.97 0.3343
2016-05-13 2016-03-31 13F AMERICAN TOWER COM 03027X100 24,309 2,730 12.65 2,489 18.98 0.3004
2016-02-12 2015-12-31 13F AMERICAN TOWER COM 03027X100 21,579 750 3.60 2,092 14.13 0.2555
2015-11-13 2015-09-30 13F AMERICAN TOWER COM 03027X100 20,829 20,829 1,833 0.2339
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.