American Tower Corporation
US ˙ NYSE ˙ US03027X1000

SecurityAMT / American Tower Corporation
InstitutionMorgan Stanley
Latest Disclosed Ownership9,583,923 shares
Latest Disclosed Value $ 1,653,994,186
Morgan Stanley reports 2.28% decrease in ownership of AMT / American Tower Corporation

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 9,583,923 shares of American Tower Corporation (US:AMT) valued at $1,653,993,431 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 9,807,651 shares of American Tower Corporation. This represents a change in shares of -2.28% during the quarter. The current value of the position is $1,858,418,509 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)
2026-05-15 2026-03-31 13F AMERICAN TOWER COM 03027X100 9,583,923 -223,728 -2.28 1,653,994 -3.95 0.0997
2026-05-27 2025-12-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 9,807,651 -226,008 -2.25 1,721,930 -10.77 0.1028
2026-02-13 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 9,807,651 -226,008 1,721,930 0.1028
2026-05-27 2025-09-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 10,033,659 836,577 9.10 1,929,674 -5.07 0.1168
2025-11-14 2025-09-30 13F AMERICAN TOWER CORP COM 03027X100 10,033,659 836,577 1,929,674 0.1168
2025-08-15 2025-06-30 13F AMERICAN TOWER CORP COM 03027X100 9,197,082 909,489 10.97 2,032,740 12.72 0.1324
2025-05-15 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 8,287,593 481,104 6.16 1,803,381 25.95 0.1289
2025-05-15 2024-12-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 7,806,489 -816,867 -9.47 1,431,789 -28.61 0.1003
2025-02-14 2024-12-31 13F AMERICAN TOWER CORP COM 03027X100 7,806,489 -816,867 1,431,789 0.1003
2025-05-14 2024-09-30 13F/A-2 AMERICAN TOWER CORP COM 03027X100 8,623,356 -652,219 -7.03 2,005,448 11.23 0.1454
2025-02-14 2024-09-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 8,623,356 -652,219 2,005,448 0.1454
2024-11-14 2024-09-30 13F AMERICAN TOWER CORP COM 03027X100 8,623,356 -652,219 2,005,448 0.1454
2025-05-14 2024-06-30 13F/A-2 AMERICAN TOWER CORP COM 03027X100 9,275,575 1,087,676 13.28 1,802,987 11.44 0.1395
2024-10-17 2024-06-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 9,275,575 1,087,676 1,802,987 0.1395
2024-08-14 2024-06-30 13F AMERICAN TOWER CORP COM 03027X100 9,275,575 1,087,676 1,802,987 0.1395
2024-10-17 2024-03-31 13F/A-2 AMERICAN TOWER CORP COM 03027X100 8,187,899 831,645 11.31 1,617,847 1.88 0.1298
2024-08-16 2024-03-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 8,187,899 831,645 1,617,847 0.1298
2024-05-15 2024-03-31 13F AMERICAN TOWER CORP COM 03027X100 8,187,899 831,645 1,617,847 0.1298
2024-08-16 2023-12-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 7,356,254 86,297 1.19 1,588,069 32.83 0.1399
2024-02-13 2023-12-31 13F AMERICAN TOWER CORP COM 03027X100 7,356,254 86,297 1,588,069 0.1399
2023-11-15 2023-09-30 13F AMERICAN TOWER CORP COM 03027X100 7,269,957 258,030 3.68 1,195,545 -12.09 0.1216
2023-08-14 2023-06-30 13F AMERICAN TOWER CORP COM 03027X100 7,011,927 -503,098 -6.69 1,359,894 -11.44 0.1340
2023-05-15 2023-03-31 13F AMERICAN TOWER CORP COM 03027X100 7,515,025 283,539 3.92 1,535,621 0.23 0.1647
2023-02-14 2022-12-31 13F AMERICAN TOWER CORP COM 03027X100 7,231,486 962,800 15.36 1,532,063 13.83 0.1740
2022-11-14 2022-09-30 13F AMERICAN TOWER CORP COM 03027X100 6,268,686 45,664 0.73 1,345,886 -15.38 0.1834
2022-10-27 2022-06-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 6,223,022 2,292,411 58.32 1,590,545 61.08 0.2065
2022-08-15 2022-06-30 13F AMERICAN TOWER CORP COM 03027X100 6,223,022 2,292,411 1,590,545 0.2065
2022-10-27 2022-03-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 3,930,611 -840,131 -17.61 987,447 -29.24 0.1332
2022-05-13 2022-03-31 13F AMERICAN TOWER CORP COM 03027X100 3,930,611 -840,131 987,447 0.1332
2022-02-14 2021-12-31 13F AMERICAN TOWER CORP COM 03027X100 4,770,742 503,295 11.79 1,395,441 23.20 0.1723
2021-11-15 2021-09-30 13F AMERICAN TOWER CORP COM 03027X100 4,267,447 -5,227 -0.12 1,132,622 -1.87 0.1525
2021-08-23 2021-06-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 4,272,674 900,101 26.69 1,154,222 43.16 0.1522
2021-08-16 2021-06-30 13F AMERICAN TOWER CORP COM 03027X100 4,272,674 900,101 1,154,222 0.0316
2021-05-17 2021-03-31 13F AMERICAN TOWER CORP COM 03027X100 3,372,573 -821,755 -19.59 806,248 -14.36 0.1184
2021-02-16 2020-12-31 13F AMERICAN TOWER CORP COM 03027X100 4,194,328 808,943 23.90 941,458 15.04 0.1454
2020-11-13 2020-09-30 13F AMERICAN TOWER CORP COM 03027X100 3,385,385 -276,512 -7.55 818,349 -13.56 0.1583
2020-08-14 2020-06-30 13F AMERICAN TOWER CORP COM 03027X100 3,661,897 164,607 4.71 946,746 24.32 0.2096
2020-05-26 2020-03-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 3,497,290 60,486 1.76 761,536 -3.58 0.2069
2020-05-15 2020-03-31 13F AMERICAN TOWER CORP COM 03027X100 3,497,290 60,486 761,536 58,501.8401
2020-02-14 2019-12-31 13F AMERICAN TOWER CORP COM 03027X100 3,436,804 -355,849 -9.38 789,848 -5.82 0.1837
2019-11-14 2019-09-30 13F AMERICAN TOWER CORP COM 03027X100 3,792,653 353,997 10.29 838,670 19.29 0.2220
2019-08-14 2019-06-30 13F AMERICAN TOWER CORP COM 03027X100 3,438,656 -125,062 -3.51 703,034 0.11 0.1871
2019-05-15 2019-03-31 13F AMERICAN TOWER CORP COM 03027X100 3,563,718 -669,753 -15.82 702,266 4.86 0.1988
2019-02-14 2018-12-31 13F AMERICAN TOWER CORP COM 03027X100 4,233,471 117,206 2.85 669,691 11.97 0.2004
2019-04-23 2018-09-30 13F/A-2 AMERICAN TOWER CORP COM 03027X100 4,116,265 873,644 26.94 598,093 27.94 0.1497
2018-11-20 2018-09-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 4,116,265 0 598,093 0.1497
2018-11-14 2018-09-30 13F AMERICAN TOWER CORP COM 03027X100 4,116,265 873,644 598,093
2019-04-23 2018-06-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 3,242,621 -115,666 -3.44 467,488 -4.22 0.1263
2018-08-14 2018-06-30 13F AMERICAN TOWER CORP COM 03027X100 3,242,621 -115,666 467,488
2019-04-23 2018-03-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 3,358,287 -140,596 -4.02 488,092 -2.22 0.1355
2018-05-14 2018-03-31 13F AMERICAN TOWER CORP COM 03027X100 3,358,287 -140,596 488,092
2019-04-23 2017-12-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 3,498,883 441,832 14.45 499,187 19.47 0.1366
2018-02-14 2017-12-31 13F AMERICAN TOWER CORP COM 03027X100 3,498,883 441,832 499,187
2017-11-14 2017-09-30 13F AMERICAN TOWER CORP COM 03027X100 3,057,051 69,466 2.33 417,837 5.70 0.1252
2017-08-11 2017-06-30 13F AMERICAN TOWER CORP COM 03027X100 2,987,585 93,319 3.22 395,319 12.38 0.1194
2017-05-22 2017-03-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 2,894,266 -649,079 -18.32 351,768 -6.06 0.1081
2017-05-12 2017-03-31 13F AMERICAN TOWER CORP COM 03027X100 2,894,266 351,768
2017-02-22 2016-12-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 3,543,345 521,195 17.25 374,461 9.33 0.1226
2017-02-13 2016-12-31 13F AMERICAN TOWER CORP COM 03027X100 3,543,345 374,461
2016-11-10 2016-09-30 13F AMERICAN TOWER CORP COM 03027X100 3,022,150 -231,684 -7.12 342,501 -7.35 0.1170
2016-08-12 2016-06-30 13F AMERICAN TOWER CORP COM 03027X100 3,253,834 325,214 11.10 369,665 23.30 0.1335
2016-05-12 2016-03-31 13F AMERICAN TOWER CORP COM 03027X100 2,928,620 -234,503 -7.41 299,803 -2.24 0.1154
2016-02-09 2015-12-31 13F AMERICAN TOWER CORP COM 03027X100 3,163,123 -8,804 -0.28 306,666 9.89 0.1110
2016-02-08 2015-09-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 3,171,927 172,713 5.76 279,065 -0.26 0.1031
2015-11-09 2015-09-30 13F AMERICAN TOWER CORP COM 03027X100 3,171,927 279,065
2015-08-12 2015-06-30 13F AMERICAN TOWER CORP COM 03027X100 2,999,214 -180,125 -5.67 279,798 -6.53 0.0970
2015-05-14 2015-03-31 13F AMERICAN TOWER CORP COM 03027X100 3,179,339 -267,766 -7.77 299,332 -12.15 0.1102
2015-02-13 2014-12-31 13F AMERICAN TOWER CORP COM 03027X100 3,447,105 -47,796 -1.37 340,744 4.13 0.1246
2014-12-16 2014-09-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 3,494,901 -43,945 -1.24 327,225 2.76 0.1258
2014-11-14 2014-09-30 13F AMERICAN TOWER CORP COM 03027X100 3,494,901 327,225
2014-08-12 2014-06-30 13F AMERICAN TOWER CORP COM 03027X100 3,538,846 3,332 0.09 318,428 10.01 0.5447
2014-05-13 2014-03-31 13F AMERICAN TOWER CORP COM 03027X100 3,535,514 123,522 3.62 289,453 6.28 0.1212
2014-02-13 2013-12-31 13F AMERICAN TOWER CORP COM 03027X100 3,411,992 641,314 23.15 272,345 32.60 0.1158
2013-11-13 2013-09-30 13F AMERICAN TOWER COM 03027X100 2,770,678 -467,112 -14.43 205,390 -13.30 0.0971
2013-08-08 2013-06-30 13F AMERICAN TOWER COM 03027X100 3,237,790 3,237,790 236,908 0.1195
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.