American Tower Corporation
US ˙ NYSE ˙ US03027X1000

SecurityAMT / American Tower Corporation
InstitutionWASHINGTON TRUST Co
Latest Disclosed Ownership64,288 shares
Latest Disclosed Value $ 11,094,823
WASHINGTON TRUST Co reports 0.05% decrease in ownership of AMT / American Tower Corporation

On April 6, 2026 - WASHINGTON TRUST Co filed a 13F-HR form disclosing ownership of 64,288 shares of American Tower Corporation (US:AMT) valued at $11,094,823 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 64,317 shares of American Tower Corporation. This represents a change in shares of -0.05% during the quarter. The current value of the position is $12,466,086 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)
2026-04-06 2026-03-31 13F AMERICAN TOWER Equities 03027X100 64,288 -29 -0.05 11,095 -1.75 0.3609
2026-02-10 2025-12-31 13F AMERICAN TOWER Equities 03027X100 64,317 -519 -0.80 11,292 -9.44 0.3587
2025-11-12 2025-09-30 13F AMERICAN TOWER Equities 03027X100 64,836 -154 -0.24 12,469 -13.19 0.4091
2025-08-08 2025-06-30 13F AMERICAN TOWER Equities 03027X100 64,990 10 0.02 14,364 1.59 0.5078
2025-04-25 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 64,980 -1,347 -2.03 14,140 16.23 0.5420
2025-01-30 2024-12-31 13F American Tower COM 03027X100 66,327 -1,404 -2.07 12,165 -22.77 0.4364
2024-10-25 2024-09-30 13F American Tower COM 03027X100 67,731 -465 -0.68 15,752 18.83 0.5522
2024-07-15 2024-06-30 13F American Tower COM 03027X100 68,196 -1,159 -1.67 13,256 -3.27 0.4849
2024-04-23 2024-03-31 13F American Tower COM 03027X100 69,355 -2 -0.00 13,704 -8.48 0.5034
2024-01-18 2023-12-31 13F American Tower COM 03027X100 69,357 -529 -0.76 14,973 30.28 0.5925
2023-10-18 2023-09-30 13F American Tower COM 03027X100 69,886 2,419 3.59 11,493 -12.17 0.5055
2023-07-27 2023-06-30 13F American Tower COM 03027X100 67,467 1,756 2.67 13,085 -2.55 0.5518
2023-05-10 2023-03-31 13F/A-1 American Tower COM 03027X100 65,711 304 0.46 13,427 -3.10 0.6049
2023-05-04 2023-03-31 13F American Tower COM 03027X100 66 -65,337 13 0.5662
2023-07-27 2022-12-31 13F/A-1 American Tower COM 03027X100 65,407 -4,200 -6.03 13,857 -7.28 0.6456
2023-02-08 2022-12-31 13F American Tower COM 03027X100 65,403 -4,204 14 0.0006
2022-10-14 2022-09-30 13F American Tower COM 03027X100 69,607 -721 -1.03 14,945 -16.86 0.7527
2022-07-25 2022-06-30 13F American Tower COM 03027X100 70,328 -73 -0.10 17,975 1.63 0.8440
2022-05-05 2022-03-31 13F American Tower COM 03027X100 70,401 4,144 6.25 17,686 -8.74 0.6998
2022-02-09 2021-12-31 13F/A-1 American Tower COM 03027X100 66,257 -57,627 -46.52 19,380 -41.06 0.7271
2022-02-09 2021-12-31 13F American Tower COM 03027X100 66,257 -57,627 19,380 0.6782
2021-11-09 2021-09-30 13F American Tower COM 03027X100 123,884 -30 -0.02 32,881 -1.77 0.9271
2021-08-05 2021-06-30 13F American Tower COM 03027X100 123,914 28 0.02 33,474 13.03 0.9441
2021-04-28 2021-03-31 13F American Tower COM 03027X100 123,886 9,135 7.96 29,616 14.98 0.9091
2021-02-09 2020-12-31 13F American Tower COM 03027X100 114,751 1,600 1.41 25,757 -5.83 0.8314
2020-11-05 2020-09-30 13F American Tower COM 03027X100 113,151 -1,503 -1.31 27,352 -6.74 1.0104
2020-08-04 2020-06-30 13F American Tower COM 03027X100 114,654 278 0.24 29,330 17.76 1.2180
2020-05-07 2020-03-31 13F American Tower COM 03027X100 114,376 2,242 2.00 24,906 -3.35 1.1873
2020-02-12 2019-12-31 13F American Tower COM 03027X100 112,134 45,703 68.80 25,770 77.88 1.0153
2019-11-06 2019-09-30 13F American Tower COM 03027X100 66,431 -277 -0.42 14,487 6.22 0.7755
2019-08-07 2019-06-30 13F American Tower COM 03027X100 66,708 -516 -0.77 13,639 5.87 0.7469
2019-05-13 2019-03-31 13F American Tower COM 03027X100 67,224 123 0.18 12,883 21.37 0.7207
2019-02-11 2018-12-31 13F American Tower COM 03027X100 67,101 1,791 2.74 10,615 11.85 0.6752
2018-11-13 2018-09-30 13F American Tower COM 03027X100 65,310 -291 -0.44 9,490 0.34 0.5080
2018-08-10 2018-06-30 13F American Tower COM 03027X100 65,601 620 0.95 9,458 0.16 0.5068
2018-05-10 2018-03-31 13F AMERICAN TOWER COMMON STOCK 03027X100 64,981 -1,198 -1.81 9,443 0.01 0.5534
2018-02-05 2017-12-31 13F AMERICAN TOWER COMMON STOCK 03027X100 66,179 2,267 3.55 9,442 8.09 0.5314
2017-10-31 2017-09-30 13F AMERICAN TOWER COMMON STOCK 03027X100 63,912 127 0.20 8,735 3.50 0.5195
2017-08-03 2017-06-30 13F AMERICAN TOWER COMMON STOCK 03027X100 63,785 1,051 1.68 8,440 10.72 0.5142
2017-05-01 2017-03-31 13F AMERICAN TOWER COMMON STOCK 03027X100 62,734 25,427 68.16 7,623 93.33 0.4831
2017-02-08 2016-12-31 13F AMERICAN TOWER COMMON STOCK 03027X100 37,307 592 1.61 3,943 -5.24 0.2552
2016-11-03 2016-09-30 13F AMERICAN TOWER COMMON STOCK 03027X100 36,715 3,151 9.39 4,161 9.10 0.2737
2016-08-11 2016-06-30 13F AMERICAN TOWER COMMON STOCK 03027X100 33,564 2,867 9.34 3,814 21.39 0.2578
2016-05-05 2016-03-31 13F AMERICAN TOWER COMMON STOCK 03027X100 30,697 2,610 9.29 3,142 15.39 0.2096
2016-02-12 2015-12-31 13F AMERICAN TOWER COMMON STOCK 03027X100 28,087 28,087 -8.50 2,723 -13.34 0.1860
2015-11-12 2015-09-30 13F AMERICAN TOWER COMMON STOCK 03027X100 0 -2,310 -100.00 0 -100.00
2015-08-07 2015-06-30 13F AMERICAN TOWER COMMON STOCK 03027X100 2,310 2,310 216 0.0142
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.