美國鐵塔公司
US ˙ NYSE ˙ US03027X1000

SecurityAMT / American Tower Corporation
InstitutionState Street Corp
Latest Disclosed Ownership21,434,609 shares
Latest Disclosed Value $ 3,699,184,821
State Street Corp reports 2.13% increase in ownership of AMT / American Tower Corporation

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 21,434,609 shares of American Tower Corporation (US:AMT) valued at $3,699,184,821 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 20,987,534 shares of American Tower Corporation. This represents a change in shares of 2.13% during the quarter. The current value of the position is $4,156,385,031 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 21,434,609 447,075 2.13 3,699,185 -0.55 0.1277
2026-02-13 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 20,987,534 71,605 0.34 3,719,634 -8.32 0.1248
2025-11-14 2025-09-30 13F AMERICAN TOWER CORP COM 03027X100 20,915,929 -197,751 -0.94 4,057,280 -13.70 0.1407
2025-08-14 2025-06-30 13F AMERICAN TOWER CORP COM 03027X100 21,113,680 -132,352 -0.62 4,701,613 1.70 0.1762
2025-05-15 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 21,246,032 118,944 0.56 4,623,137 18.28 0.1905
2025-02-14 2024-12-31 13F AMERICAN TOWER CORP COM 03027X100 21,127,088 -46,335 -0.22 3,908,764 -20.62 0.1542
2024-11-14 2024-09-30 13F AMERICAN TOWER CORP COM 03027X100 21,173,423 635,726 3.10 4,924,091 22.35 0.2004
2024-08-14 2024-06-30 13F AMERICAN TOWER CORP COM 03027X100 20,537,697 -70,699 -0.34 4,024,602 -1.16 0.1759
2024-05-15 2024-03-31 13F AMERICAN TOWER CORP COM 03027X100 20,608,396 -237,605 -1.14 4,072,013 -10.21 0.1820
2024-02-14 2023-12-31 13F AMERICAN TOWER CORP COM 03027X100 20,846,001 898,411 4.50 4,535,242 38.25 0.2206
2023-11-14 2023-09-30 13F AMERICAN TOWER CORP COM 03027X100 19,947,590 -453,589 -2.22 3,280,381 -17.74 0.1819
2023-08-14 2023-06-30 13F AMERICAN TOWER CORP COM 03027X100 20,401,179 77,155 0.38 3,987,902 -3.98 0.2094
2023-05-15 2023-03-31 13F AMERICAN TOWER CORP COM 03027X100 20,324,024 -993,154 -4.66 4,153,002 -8.71 0.2344
2023-05-15 2022-12-31 13F/A-99 AMERICAN TOWER CORP COM 03027X100 21,317,178 39,509 0.19 4,549,320 -0.42 0.2673
2023-05-15 2022-12-31 13F AMERICAN TOWER CORP COM 03027X100 21,317,178 39,509 4,549,320 0.2673
2022-11-15 2022-09-30 13F AMERICAN TOWER CORP COM 03027X100 21,277,669 -72,524 -0.34 4,568,316 -16.74 0.2890
2022-08-15 2022-06-30 13F AMERICAN TOWER CORP COM 03027X100 21,350,193 96,970 0.46 5,486,565 2.76 0.3288
2022-05-16 2022-03-31 13F AMERICAN TOWER CORP COM 03027X100 21,253,223 1,550,683 7.87 5,339,235 -7.78 0.2640
2022-02-14 2021-12-31 13F AMERICAN TOWER CORP COM 03027X100 19,702,540 953,582 5.09 5,789,646 15.78 0.2746
2021-11-15 2021-09-30 13F AMERICAN TOWER CORP COM 03027X100 18,748,958 643,590 3.55 5,000,532 1.77 0.2643
2021-08-16 2021-06-30 13F AMERICAN TOWER CORP COM 03027X100 18,105,368 867,164 5.03 4,913,452 19.23 0.2590
2021-07-09 2021-03-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 17,238,204 -31,680 -0.18 4,120,965 5.75 0.2363
2021-05-17 2021-03-31 13F AMERICAN TOWER CORP COM 03027X100 17,238,204 -31,680 4,120,965 0.2363
2021-02-16 2020-12-31 13F AMERICAN TOWER CORP COM 03027X100 17,269,884 -376,689 -2.13 3,897,055 -9.07 0.2386
2020-11-10 2020-09-30 13F AMERICAN TOWER CORP COM 03027X100 17,646,573 -1,692,007 -8.75 4,285,678 -14.65 0.2926
2020-08-14 2020-06-30 13F AMERICAN TOWER CORP COM 03027X100 19,338,580 -308,064 -1.57 5,021,353 17.37 0.3650
2020-06-19 2020-03-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 19,646,644 -232,093 -1.17 4,278,057 -6.76 0.3741
2020-05-11 2020-03-31 13F AMERICAN TOWER CORP COM 03027X100 19,646,644 -232,093 4,278,057 375,699.5444
2020-02-06 2019-12-31 13F AMERICAN TOWER CORP COM 03027X100 19,878,737 1,266,057 6.80 4,588,391 11.01 0.3143
2019-11-14 2019-09-30 13F AMERICAN TOWER CORP COM 03027X100 18,612,680 238,036 1.30 4,133,390 9.54 0.3081
2019-08-14 2019-06-30 13F AMERICAN TOWER CORP COM 03027X100 18,374,644 -57,188 -0.31 3,773,261 3.88 0.2813
2019-05-15 2019-03-31 13F AMERICAN TOWER CORP COM 03027X100 18,431,832 515,135 2.88 3,632,177 27.48 0.2834
2019-02-12 2018-12-31 13F AMERICAN TOWER CORP COM 03027X100 17,916,697 7,994 0.04 2,849,243 9.46 0.2594
2018-11-09 2018-09-30 13F AMERICAN TOWER Common equity shares 03027X100 17,908,703 550,226 3.17 2,603,014 3.98 0.1999
2018-08-14 2018-06-30 13F AMERICAN TOWER Common equity shares 03027X100 17,358,477 1,151,264 7.10 2,503,429 6.28 0.2093
2018-05-15 2018-03-31 13F AMERICAN TOWER Common equity shares 03027X100 16,207,213 -1,432,926 -8.12 2,355,553 -6.43 0.2000
2018-02-14 2017-12-31 13F AMERICAN TOWER Common equity shares 03027X100 17,640,139 -287,220 -1.60 2,517,504 2.70 0.2024
2017-11-14 2017-09-30 13F AMERICAN TOWER Common equity shares 03027X100 17,927,359 -580,785 -3.14 2,451,422 0.05 0.2115
2017-08-14 2017-06-30 13F AMERICAN TOWER Common equity shares 03027X100 18,508,144 -343,703 -1.82 2,450,157 6.94 0.2167
2017-05-15 2017-03-31 13F AMERICAN TOWER Common equity shares 03027X100 18,851,847 -855,236 -4.34 2,291,256 9.94 0.2044
2017-02-09 2016-12-31 13F AMERICAN TOWER Common equity shares 03027X100 19,707,083 -584,503 -2.88 2,084,181 -9.43 0.1961
2017-01-13 2016-09-30 13F/A-1 AMERICAN TOWER Common equity shares 03027X100 20,291,586 3,548,376 21.19 2,301,229 20.98 0.2319
2016-11-14 2016-09-30 13F AMERICAN TOWER Common equity shares 03027X100 15,676,122 1,778,159
2016-08-12 2016-06-30 13F AMERICAN TOWER Common equity shares 03027X100 16,743,210 -338,991 -1.98 1,902,187 8.78 0.2043
2016-05-20 2016-03-31 13F/A-1 AMERICAN TOWER Common equity shares 03027X100 17,082,201 -305,407 -1.76 1,748,709 3.74 0.1891
2016-05-12 2016-03-31 13F AMERICAN TOWER Common equity shares 03027X100 17,082,201 1,748,709
2016-02-16 2015-12-31 13F AMERICAN TOWER Common equity shares 03027X100 17,387,608 336,770 1.98 1,685,728 12.37 0.1842
2015-11-16 2015-09-30 13F AMERICAN TOWER Common equity shares 03027X100 17,050,838 -317,277 -1.83 1,500,129 -7.41 0.1746
2015-08-13 2015-06-30 13F AMERICAN TOWER Common equity shares 03027X100 17,368,115 -376,820 -2.12 1,620,268 -3.02 0.1732
2015-05-15 2015-03-31 13F AMERICAN TOWER Common equity shares 03027X100 17,744,935 -107,172 -0.60 1,670,692 -5.33 0.1714
2015-02-11 2014-12-31 13F AMERICAN TOWER Common equity shares 03027X100 17,852,107 492,561 2.84 1,764,678 8.57 0.1758
2014-11-12 2014-09-30 13F/A-1 AMERICAN TOWER Common equity shares 03027X100 17,359,546 468,458 2.77 1,625,363 6.94 0.1749
2014-11-10 2014-09-30 13F AMERICAN TOWER Common equity shares 03027X100 17,359,546 1,625,363
2014-08-12 2014-06-30 13F AMERICAN TOWER Common equity shares 03027X100 16,891,088 174,473 1.04 1,519,865 11.05 0.1641
2014-05-15 2014-03-31 13F/A-1 AMERICAN TOWER Common equity shares 03027X100 16,716,615 -665,162 -3.83 1,368,586 -1.36 0.1555
2014-05-13 2014-03-31 13F AMERICAN TOWER Common equity shares 03027X100 16,716,615 1,368,586
2014-02-06 2013-12-31 13F/A-1 AMERICAN TOWER Common equity shares 03027X100 17,381,777 432,286 2.55 1,387,413 10.42 0.1543
2014-02-06 2013-12-31 13F AMERICAN TOWER Common equity shares 03027X100 16,299,926 1,259,506
2013-11-12 2013-09-30 13F AMERICAN TOWER Common equity shares 03027X100 16,949,491 -69,891 -0.41 1,256,468 0.90 0.1548
2013-08-08 2013-06-30 13F AMERICAN TOWER Common equity shares 03027X100 17,019,382 17,019,382 1,245,301 0.1624
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.