American Tower Corporation
US ˙ NYSE ˙ US03027X1000

SecurityAMT / American Tower Corporation
InstitutionWhittier Trust Co
Latest Disclosed Ownership11,800 shares
Latest Disclosed Value $ 2,078,452
Whittier Trust Co reports 7.54% decrease in ownership of AMT / American Tower Corporation

On April 28, 2026 - Whittier Trust Co filed a 13F-HR form disclosing ownership of 11,800 shares of American Tower Corporation (US:AMT) valued at $2,036,444 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 12,762 shares of American Tower Corporation. This represents a change in shares of -7.54% during the quarter. The current value of the position is $2,150,432 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)
2026-04-28 2026-03-31 13F AMER TOWER common 03027X100 11,800 -962 -7.54 2,078 -7.36 0.0235
2026-01-26 2025-12-31 13F AMER TOWER common 03027X100 12,762 -1,594 -11.10 2,244 -17.84 0.0243
2025-10-31 2025-09-30 13F AMERICAN TOWER CORP common 03027X100 14,356 -1,285 -8.22 2,731 -21.01 0.0311
2025-07-30 2025-06-30 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 15,641 -13 -0.08 3,457 1.47 0.0417
2025-05-02 2025-03-31 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 15,654 -1,940 -11.03 3,406 5.58 0.0475
2025-02-11 2024-12-31 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 17,594 -1,377 -7.26 3,227 -26.86 0.0425
2024-10-21 2024-09-30 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 18,971 -1,685 -8.16 4,412 9.86 0.0590
2024-07-29 2024-06-30 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 20,656 -2,664 -11.42 4,015 -12.85 0.0570
2024-05-02 2024-03-31 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 23,320 -30,638 -56.78 4,608 -60.44 0.0672
2024-01-11 2023-12-31 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 53,958 -32,395 -37.51 11,648 -17.98 0.1888
2023-10-27 2023-09-30 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 86,353 1,230 1.44 14,200 -13.98 0.2524
2023-07-24 2023-06-30 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 85,123 -1,900 -2.18 16,508 -7.16 0.2870
2023-04-21 2023-03-31 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 87,023 -299 -0.34 17,782 -3.88 0.3237
2023-01-25 2022-12-31 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 87,322 -22,980 -20.83 18,500 -21.88 0.3598
2022-10-21 2022-09-30 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 110,302 2,976 2.77 23,681 -13.67 0.4963
2022-07-28 2022-06-30 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 107,326 953 0.90 27,431 2.65 0.5540
2022-04-29 2022-03-31 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 106,373 1,546 1.47 26,723 -12.85 0.4507
2022-01-19 2021-12-31 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 104,827 1,575 1.53 30,662 11.89 0.4983
2021-11-01 2021-09-30 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 103,252 520 0.51 27,403 -1.25 0.4990
2021-07-29 2021-06-30 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 102,732 3,036 3.05 27,751 16.44 0.4943
2021-04-26 2021-03-31 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 99,696 2,825 2.92 23,833 9.61 0.4629
2021-01-29 2020-12-31 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 96,871 3,241 3.46 21,743 -3.93 0.4644
2020-10-30 2020-09-30 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 93,630 576 0.62 22,633 -5.92 0.5389
2020-07-10 2020-06-30 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 93,054 1,980 2.17 24,057 21.31 0.6681
2020-04-27 2020-03-31 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 91,074 -1,135 -1.23 19,831 -6.42 0.6475
2020-01-31 2019-12-31 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 92,209 1,060 1.16 21,192 5.15 0.5560
2019-10-18 2019-09-30 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 91,149 1,879 2.10 20,155 10.43 0.5768
2019-07-23 2019-06-30 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 89,270 1,491 1.70 18,251 5.51 0.5360
2019-04-29 2019-03-31 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 87,779 694 0.80 17,298 25.57 0.5289
2019-02-07 2018-12-31 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 87,085 -768 -0.87 13,776 7.92 0.4740
2018-10-23 2018-09-30 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 87,853 869 1.00 12,765 1.79 0.3983
2018-07-27 2018-06-30 13F/A-1 AMERICAN TOWER CORP NEW COM REIT'S 03027X100 86,984 5,413 6.64 12,541 5.79 0.4143
2018-07-20 2018-06-30 13F AMERICAN TOWER CORP NEW COM US LARGE CAP EQUITIES 03027X100 65,418 -16,153 5,886
2018-05-01 2018-03-31 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 81,571 3,543 4.54 11,855 6.49 0.3983
2018-02-07 2017-12-31 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 78,028 3,562 4.78 11,132 9.37 0.3883
2017-10-23 2017-09-30 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 74,466 669 0.91 10,178 4.23 0.3710
2017-07-20 2017-06-30 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 73,797 1,142 1.57 9,765 10.59 0.3775
2017-04-26 2017-03-31 13F AMERICAN TOWER CORP REIT'S 03027X100 72,655 1,894 2.68 8,830 18.08 0.3562
2017-01-18 2016-12-31 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 70,761 597 0.85 7,478 -5.95 0.3181
2016-11-10 2016-09-30 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 70,164 -5,995 -7.87 7,951 -8.10 0.3463
2016-07-28 2016-06-30 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 76,159 842 1.12 8,652 12.22 0.3812
2016-04-28 2016-03-31 13F AMERICAN TOWER CORP NEW COM REIT'S 03027X100 75,317 1,938 2.64 7,710 8.38 0.3409
2016-02-10 2015-12-31 13F AMERICAN TOWER CORP NEW COM REIT?S 03027X100 73,379 1,343 1.86 7,114 12.26 0.3228
2015-11-12 2015-09-30 13F AMERICAN TOWER CORP NEW COM REIT?S 03027X100 72,036 -286 -0.40 6,337 -6.08 0.3082
2015-08-13 2015-06-30 13F AMERICAN TOWER CORP NEW COM REIT?S 03027X100 72,322 5,101 7.59 6,747 6.60 0.2995
2015-05-05 2015-03-31 13F AMERICAN TOWER CORP NEW COM US LARGE CAP EQUITIES 03027X100 67,221 67,221 -7.05 6,329 -6.20 0.2901
2015-02-04 2014-12-31 13F AMERICAN TOWER CORP NEW COM US LARGE CAP EQUITIES 03027X100 0 -65,713 -100.00 0 -100.00
2014-11-07 2014-09-30 13F AMERICAN TOWER CORP NEW COM US LARGE CAP EQUITIES 03027X100 65,713 295 0.45 6,153 4.54 0.2998
2014-08-04 2014-06-30 13F AMERICAN TOWER CORP NEW COM US LARGE CAP EQUITIES 03027X100 65,418 1,299 2.03 5,886 12.14 0.2902
2014-05-01 2014-03-31 13F AMERICAN TOWER CORP NEW COM US LARGE CAP EQUITIES 03027X100 64,119 842 1.33 5,249 3.94 0.2690
2014-02-05 2013-12-31 13F AMERICAN TOWER CORP NEW COM US LARGE CAP EQUITIES 03027X100 63,277 184 0.29 5,050 7.98 0.2590
2013-11-18 2013-09-30 13F AMERICAN TOWER CORP COM 03027X100 63,093 584 0.93 4,677 2.25 0.2531
2013-08-14 2013-06-30 13F AMERICAN TOWER CORP COM 03027X100 62,509 62,509 4,574 0.2563
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.