American Tower Corporation
US ˙ NYSE ˙ US03027X1000

SecurityAMT / American Tower Corporation
InstitutionDavis R M Inc
Latest Disclosed Ownership289,155 shares
Latest Disclosed Value $ 49,902,400
Davis R M Inc reports 1.41% increase in ownership of AMT / American Tower Corporation

On May 13, 2026 - Davis R M Inc filed a 13F-HR form disclosing ownership of 289,155 shares of American Tower Corporation (US:AMT) valued at $49,902,370 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 285,147 shares of American Tower Corporation. This represents a change in shares of 1.41% during the quarter. The current value of the position is $52,695,607 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)
2026-05-13 2026-03-31 13F AMERICAN TOWER COM 03027X100 289,155 4,008 1.41 49,902 -0.32 0.8857
2026-02-12 2025-12-31 13F American Tower COM 03027X100 285,147 -2,186 -0.76 50,063 -9.40 0.8619
2025-11-12 2025-09-30 13F American Tower COM 03027X100 287,333 -3,674 -1.26 55,260 -14.08 0.9660
2025-08-07 2025-06-30 13F American Tower COM 03027X100 291,007 -2,160 -0.74 64,318 0.82 1.1926
2025-05-08 2025-03-31 13F American Tower COM 03027X100 293,167 771 0.26 63,793 18.95 1.2773
2025-02-07 2024-12-31 13F American Tower COM 03027X100 292,396 -5,760 -1.93 53,628 -22.66 1.0465
2024-11-13 2024-09-30 13F American Tower COM 03027X100 298,156 -4,150 -1.37 69,339 18.00 1.3399
2024-08-09 2024-06-30 13F American Tower COM 03027X100 302,306 -2,220 -0.73 58,762 -2.34 1.1931
2024-05-10 2024-03-31 13F American Tower COM 03027X100 304,526 -6,328 -2.04 60,171 -10.34 1.2597
2024-02-09 2023-12-31 13F American Tower COM 03027X100 310,854 -1,512 -0.48 67,107 131,482.35 1.5482
2023-11-14 2023-09-30 13F American Tower COM 03027X100 312,366 8,347 2.75 51 -12.07 1.2887
2023-08-10 2023-06-30 13F American Tower COM 03027X100 304,019 12,021 4.12 59 -1.69 1.4162
2023-05-01 2023-03-31 13F American Tower COM 03027X100 291,998 224 0.08 60 -3.28 1.5195
2023-02-14 2022-12-31 13F American Tower COM 03027X100 291,774 4,417 1.54 62 -99.90 1.6661
2022-11-08 2022-09-30 13F American Tower COM 03027X100 287,357 -5,700 -1.95 61,696 -17.63 1.7895
2022-08-08 2022-06-30 13F American Tower COM 03027X100 293,057 -3,307 -1.12 74,902 0.60 2.0883
2022-05-05 2022-03-31 13F American Tower COM 03027X100 296,364 -5,438 -1.80 74,453 -15.66 1.7728
2022-02-08 2021-12-31 13F American Tower COM 03027X100 301,802 -5,128 -1.67 88,277 8.37 1.9674
2021-11-08 2021-09-30 13F American Tower COM 03027X100 306,930 -7,529 -2.39 81,462 -4.10 2.0200
2021-08-12 2021-06-30 13F American Tower COM 03027X100 314,459 -9,021 -2.79 84,948 9.85 2.1356
2021-05-10 2021-03-31 13F American Tower COM 03027X100 323,480 -11,071 -3.31 77,331 2.98 2.1248
2021-01-27 2020-12-31 13F American Tower COM 03027X100 334,551 -2,440 -0.72 75,093 -7.82 2.1550
2020-12-01 2020-09-30 13F American Tower COM 03027X100 336,991 -4,647 -1.36 81,461 -7.77 2.6623
2020-07-20 2020-06-30 13F American Tower COM 03027X100 341,638 -15,402 -4.31 88,327 13.61 3.1477
2020-04-24 2020-03-31 13F American Tower COM 03027X100 357,040 -8,474 -2.32 77,746 -7.45 3.2310
2020-01-23 2019-12-31 13F American Tower COM 03027X100 365,514 -1,306 -0.36 84,002 3.56 2.7539
2019-10-24 2019-09-30 13F American Tower COM 03027X100 366,820 -4,507 -1.21 81,115 6.85 2.8572
2019-07-31 2019-06-30 13F American Tower COM 03027X100 371,327 -7,740 -2.04 75,918 1.63 2.7016
2019-04-29 2019-03-31 13F American Tower COM 03027X100 379,067 -4,870 -1.27 74,699 22.99 2.7803
2019-01-18 2018-12-31 13F American Tower COM 03027X100 383,937 3,308 0.87 60,735 9.82 2.4864
2018-10-17 2018-09-30 13F American Tower COM 03027X100 380,629 3,369 0.89 55,305 1.68 2.0068
2018-07-19 2018-06-30 13F AMERICAN TOWER COM 03027X100 377,260 3,111 0.83 54,390 0.02 2.1161
2018-04-19 2018-03-31 13F AMERICAN TOWER COM 03027X100 374,149 -1,901 -0.51 54,379 1.36 2.1673
2018-01-16 2017-12-31 13F AMERICAN TOWER COM 03027X100 376,050 -398 -0.11 53,651 4.27 2.1038
2017-10-24 2017-09-30 13F AMERICAN TOWER COM 03027X100 376,448 3,733 1.00 51,453 4.33 2.1264
2017-07-31 2017-06-30 13F AMERICAN TOWER COM 03027X100 372,715 -3,229 -0.86 49,318 7.94 2.0846
2017-05-03 2017-03-31 13F AMERICAN TOWER COM 03027X100 375,944 17,397 4.85 45,692 20.59 2.0655
2017-01-18 2016-12-31 13F AMERICAN TOWER COM 03027X100 358,547 8,536 2.44 37,891 -4.48 1.8107
2016-10-19 2016-09-30 13F AMERICAN TOWER COM 03027X100 350,011 17,477 5.26 39,667 5.00 1.9350
2016-07-14 2016-06-30 13F AMERICAN TOWER COM 03027X100 332,534 11,512 3.59 37,779 14.96 1.8565
2016-04-18 2016-03-31 13F AMERICAN TOWER COM 03027X100 321,022 13,818 4.50 32,863 10.34 1.6731
2016-01-14 2015-12-31 13F AMERICAN TOWER COM 03027X100 307,204 22,199 7.79 29,783 18.78 1.5230
2015-10-16 2015-09-30 13F AMERICAN TOWER COM 03027X100 285,005 16,286 6.06 25,075 0.02 1.3397
2015-07-16 2015-06-30 13F AMERICAN TOWER COM 03027X100 268,719 15,527 6.13 25,069 5.16 1.2950
2015-04-17 2015-03-31 13F AMERICAN TOWER COM 03027X100 253,192 14,559 6.10 23,838 1.06 1.2540
2015-01-23 2014-12-31 13F AMERICAN TOWER COM 03027X100 238,633 9,444 4.12 23,589 9.93 1.3001
2014-10-20 2014-09-30 13F/A-2 AMERICAN TOWER COM 03027X100 229,189 -2,186 -0.94 21,459 3.07 1.2326
2014-10-20 2014-09-30 13F/A-1 AMERICAN TOWER COM 03027X100 229,189 0 21,459 1.2326
2014-10-20 2014-09-30 13F AMERICAN TOWER COM 03027X100 231,375 20,819
2014-07-15 2014-06-30 13F AMERICAN TOWER COM 03027X100 231,375 -6,328 -2.66 20,819 6.98 1.1975
2014-04-15 2014-03-31 13F AMERICAN TOWER COM 03027X100 237,703 -2,275 -0.95 19,461 1.60 1.1819
2014-01-27 2013-12-31 13F AMERICAN TOWER COM 03027X100 239,978 -16,248 -6.34 19,155 0.85 1.1719
2013-10-23 2013-09-30 13F AMERICAN TOWER COM 03027X100 256,226 -2,178 -0.84 18,994 0.46 1.2810
2013-08-12 2013-06-30 13F AMERICAN TOWER COM 03027X100 258,404 258,404 18,907 1.3488
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.