American Tower Corporation
US ˙ NYSE ˙ US03027X1000

SecurityAMT / American Tower Corporation
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership5,811,041 shares
Latest Disclosed Value $ 1,002,830,074
Dimensional Fund Advisors Lp reports 7.51% decrease in ownership of AMT / American Tower Corporation

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 5,811,041 shares of American Tower Corporation (US:AMT) valued at $1,002,869,456 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 6,283,130 shares of American Tower Corporation. This represents a change in shares of -7.51% during the quarter. The current value of the position is $1,059,004,112 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)
2026-05-07 2026-03-31 13F AMERICAN TOWER COM 03027X100 5,811,041 -472,089 -7.51 1,002,830 -9.09 0.0449
2026-02-12 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 6,283,130 -74,712 -1.18 1,103,150 -9.78 0.2314
2025-11-12 2025-09-30 13F AMERICAN TOWER CORP COM 03027X100 6,357,842 -229,109 -3.48 1,222,781 -16.01 0.2624
2025-08-12 2025-06-30 13F AMERICAN TOWER CORP COM 03027X100 6,586,951 52,089 0.80 1,455,800 2.38 0.3371
2025-05-13 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 6,534,862 88,120 1.37 1,421,965 20.26 0.3534
2025-02-13 2024-12-31 13F AMERICAN TOWER CORP COM 03027X100 6,446,742 -50,637 -0.78 1,182,380 -21.75 0.2840
2024-11-07 2024-09-30 13F AMERICAN TOWER CORP COM 03027X100 6,497,379 -17,517 -0.27 1,510,991 19.32 0.3665
2024-08-09 2024-06-30 13F AMERICAN TOWER CORP COM 03027X100 6,514,896 -4,494 -0.07 1,266,381 -1.69 0.3308
2024-05-10 2024-03-31 13F AMERICAN TOWER CORP COM 03027X100 6,519,390 58,237 0.90 1,288,166 -7.65 0.3488
2024-02-07 2023-12-31 13F AMERICAN TOWER CORP COM 03027X100 6,461,153 -33,005 -0.51 1,394,849 30.61 0.4073
2023-11-09 2023-09-30 13F AMERICAN TOWER CORP COM 03027X100 6,494,158 23,479 0.36 1,067,950 -14.90 0.3503
2023-08-09 2023-06-30 13F AMERICAN TOWER CORP COM 03027X100 6,470,679 123,502 1.95 1,254,918 -3.24 0.3999
2023-05-12 2023-03-31 13F AMERICAN TOWER CORP COM 03027X100 6,347,177 152,055 2.45 1,296,961 98,753.73 0.4369
2023-02-09 2022-12-31 13F AMERICAN TOWER CORP COM 03027X100 6,195,122 -28,687 -0.46 1,313 -99.90 0.3878
2022-11-10 2022-09-30 13F AMERICAN TOWER CORP COM 03027X100 6,223,809 91,188 1.49 1,336,250 -14.75 0.5130
2022-08-12 2022-06-30 13F AMERICAN TOWER CORP COM 03027X100 6,132,621 -80,547 -1.30 1,567,416 0.42 0.5622
2022-05-13 2022-03-31 13F AMERICAN TOWER CORP COM 03027X100 6,213,168 112,662 1.85 1,560,871 -12.53 0.4808
2022-02-09 2021-12-31 13F AMERICAN TOWER CORP COM 03027X100 6,100,506 -64,383 -1.04 1,784,390 9.05 0.5395
2021-11-12 2021-09-30 13F AMERICAN TOWER CORP COM 03027X100 6,164,889 -72,071 -1.16 1,636,252 -2.89 0.5271
2021-08-12 2021-06-30 13F AMERICAN TOWER CORP COM 03027X100 6,236,960 30,164 0.49 1,684,866 13.55 0.5335
2021-05-14 2021-03-31 13F AMERICAN TOWER CORP COM 03027X100 6,206,796 91,490 1.50 1,483,787 8.10 0.4908
2021-03-08 2020-12-31 13F/A-2 AMERICAN TOWER CORP COM 03027X100 6,115,306 218,524 3.71 1,372,618 -3.70 0.4957
2021-02-11 2020-12-31 13F AMERICAN TOWER CORP COM 03027X100 6,115,306 218,524 1,372,618 495,716.6630
2020-11-12 2020-09-30 13F AMERICAN TOWER CORP COM 03027X100 5,896,782 -87,895 -1.47 1,425,413 -7.87 0.6045
2020-08-13 2020-06-30 13F AMERICAN TOWER CORP COM 03027X100 5,984,677 -454,296 -7.06 1,547,240 10.35 0.6801
2020-05-14 2020-03-31 13F AMERICAN TOWER CORP COM 03027X100 6,438,973 -173,831 -2.63 1,402,182 -7.74 0.7305
2020-02-14 2019-12-31 13F AMERICAN TOWER CORP COM 03027X100 6,612,804 3,417 0.05 1,519,748 3.98 0.5539
2019-11-12 2019-09-30 13F AMERICAN TOWER CORP COM 03027X100 6,609,387 -13,823 -0.21 1,461,519 7.93 0.5679
2019-08-13 2019-06-30 13F AMERICAN TOWER CORP COM 03027X100 6,623,210 49,790 0.76 1,354,128 4.54 0.5258
2019-08-12 2019-03-31 13F/A-2 AMERICAN TOWER CORP COM 03027X100 6,573,420 15,452 0.24 1,295,344 24.86 0.5159
2019-05-10 2019-03-31 13F AMERICAN TOWER CORP COM 03027X100 6,573,420 15,452 1,295,344
2019-02-26 2018-12-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 6,557,968 144,064 2.25 1,037,413 11.32 0.4700
2019-02-13 2018-12-31 13F AMERICAN TOWER CORP COM 03027X100 6,557,968 144,064 1,037,413
2018-11-13 2018-09-30 13F AMERICAN TOWER CORP COM 03027X100 6,413,904 381,712 6.33 931,927 7.16 0.3547
2018-08-10 2018-06-30 13F AMERICAN TOWER CORP COM 03027X100 6,032,192 713,894 13.42 869,663 12.51 0.3467
2018-05-11 2018-03-31 13F AMERICAN TOWER CORP COM 03027X100 5,318,298 1,782,280 50.40 772,961 53.22 0.3221
2018-02-12 2017-12-31 13F AMERICAN TOWER CORP COM 03027X100 3,536,018 1,025,574 40.85 504,486 47.03 0.2091
2017-11-13 2017-09-30 13F AMERICAN TOWER CORP COM 03027X100 2,510,444 904,325 56.30 343,124 61.45 0.1499
2017-08-11 2017-06-30 13F AMERICAN TOWER CORP COM 03027X100 1,606,119 1,432,155 823.25 212,525 905.32 0.0981
2017-05-12 2017-03-31 13F AMERICAN TOWER CORP COM 03027X100 173,964 4,068 2.39 21,140 17.71 0.0101
2017-02-09 2016-12-31 13F AMERICAN TOWER CORP COM 03027X100 169,896 4,377 2.64 17,959 -4.26 0.0090
2016-11-10 2016-09-30 13F AMERICAN TOWER CORP COM 03027X100 165,519 6,492 4.08 18,759 3.84 0.0101
2016-08-09 2016-06-30 13F AMERICAN TOWER CORP COM 03027X100 159,027 -4,441 -2.72 18,065 7.95 0.0104
2016-05-13 2016-03-31 13F AMERICAN TOWER CORP COM 03027X100 163,468 6,543 4.17 16,734 9.95 0.0100
2016-02-10 2015-12-31 13F AMERICAN TOWER CORP COM 03027X100 156,925 2,486 1.61 15,219 12.02 0.0095
2015-11-13 2015-09-30 13F AMERICAN TOWER CORP COM 03027X100 154,439 1,515 0.99 13,586 -4.77 0.0089
2015-08-14 2015-06-30 13F AMERICAN TOWER CORP COM 03027X100 152,924 -6,814 -4.27 14,266 -5.19 0.0087
2015-05-14 2015-03-31 13F AMERICAN TOWER CORP COM 03027X100 159,738 6,249 4.07 15,047 -0.88 0.0095
2015-02-06 2014-12-31 13F AMERICAN TOWER CORP COM 03027X100 153,489 -643 -0.42 15,180 5.18 0.0100
2014-11-13 2014-09-30 13F AMERICAN TOWER CORP COM 03027X100 154,132 -5,779 -3.61 14,432 0.34 0.0102
2014-08-08 2014-06-30 13F AMERICAN TOWER CORP COM 03027X100 159,911 -678 -0.42 14,383 9.44 0.0100
2014-05-14 2014-03-31 13F AMERICAN TOWER CORP COM 03027X100 160,589 -2,888 -1.77 13,142 0.71 0.0098
2014-02-12 2013-12-31 13F AMERICAN TOWER CORP COM 03027X100 163,477 -3,202 -1.92 13,049 5.62 0.0102
2013-11-13 2013-09-30 13F AMERICAN TOWER CORP COM 03027X100 166,679 -110,693 -39.91 12,355 -39.14 0.0107
2013-08-15 2013-06-30 13F AMERICAN TOWER CORP COM 03027X100 277,372 277,372 20,301 0.0191
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.