American Tower Corporation
US ˙ NYSE ˙ US03027X1000

SecurityAMT / American Tower Corporation
InstitutionD.a. Davidson & Co.
Latest Disclosed Ownership16,373 shares
Latest Disclosed Value $ 2,825,752
D.a. Davidson & Co. reports 15.42% increase in ownership of AMT / American Tower Corporation

On May 5, 2026 - D.a. Davidson & Co. filed a 13F-HR form disclosing ownership of 16,373 shares of American Tower Corporation (US:AMT) valued at $2,825,652 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 14,186 shares of American Tower Corporation. This represents a change in shares of 15.42% during the quarter. The current value of the position is $3,174,888 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)
2026-05-05 2026-03-31 13F AMERICAN TOWER COM 03027X100 16,373 2,187 15.42 2,826 13.45 0.0171
2026-01-29 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 14,186 174 1.24 2,491 -7.57 0.0153
2025-10-22 2025-09-30 13F AMERICAN TOWER CORP COM 03027X100 14,012 -828 -5.58 2,695 -17.84 0.0172
2025-07-30 2025-06-30 13F AMERICAN TOWER CORP COM 03027X100 14,840 -390 -2.56 3,280 -1.06 0.0231
2025-04-28 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 15,230 -4,732 -23.71 3,314 -9.48 0.0266
2025-01-31 2024-12-31 13F AMERICAN TOWER CORP COM 03027X100 19,962 -715 -3.46 3,661 -23.86 0.0298
2024-11-13 2024-09-30 13F AMERICAN TOWER CORP COM 03027X100 20,677 -2,472 -10.68 4,809 6.87 0.0397
2024-08-01 2024-06-30 13F AMERICAN TOWER CORP COM 03027X100 23,149 -20,496 -46.96 4,500 -47.83 0.0399
2024-05-13 2024-03-31 13F AMERICAN TOWER CORP COM 03027X100 43,645 -18,264 -29.50 8,624 -35.48 0.0777
2024-02-09 2023-12-31 13F AMERICAN TOWER CORP COM 03027X100 61,909 -4,790 -7.18 13,365 21.85 0.1310
2023-11-08 2023-09-30 13F AMERICAN TOWER CORP COM 03027X100 66,699 -3,913 -5.54 10,969 -19.91 0.1191
2023-08-11 2023-06-30 13F AMERICAN TOWER CORP COM 03027X100 70,612 8,570 13.81 13,695 8.05 0.1446
2023-04-25 2023-03-31 13F AMERICAN TOWER CORP COM 03027X100 62,042 646 1.05 12,674 -2.59 0.1426
2023-02-03 2022-12-31 13F AMERICAN TOWER CORP COM 03027X100 61,396 -4,527 -6.87 13,012 -8.07 0.1535
2022-11-07 2022-09-30 13F AMERICAN TOWER CORP COM 03027X100 65,923 1,464 2.27 14,153 -14.09 0.1854
2022-07-28 2022-06-30 13F AMERICAN TOWER CORP COM 03027X100 64,459 13,521 26.54 16,475 28.74 0.2069
2022-05-12 2022-03-31 13F AMERICAN TOWER CORP COM 03027X100 50,938 13,589 36.38 12,797 17.16 0.1394
2022-01-31 2021-12-31 13F AMERICAN TOWER CORP COM 03027X100 37,349 31,565 545.73 10,923 611.60 0.1164
2021-11-15 2021-09-30 13F AMERICAN TOWER CORP COM 03027X100 5,784 -339 -5.54 1,535 -7.19 0.0178
2021-08-10 2021-06-30 13F AMERICAN TOWER CORP COM 03027X100 6,123 93 1.54 1,654 14.70 0.0194
2021-05-07 2021-03-31 13F AMERICAN TOWER CORP COM 03027X100 6,030 171 2.92 1,442 9.99 0.0184
2021-02-10 2020-12-31 13F AMERICAN TOWER CORP COM 03027X100 5,859 -2,897 -33.09 1,311 -38.07 0.0200
2020-11-02 2020-09-30 13F AMERICAN TOWER CORP COM 03027X100 8,756 237 2.78 2,117 -3.90 0.0368
2020-08-10 2020-06-30 13F AMERICAN TOWER CORP COM 03027X100 8,519 -3,757 -30.60 2,203 -17.98 0.0411
2020-05-05 2020-03-31 13F AMERICAN TOWER CORP COM 03027X100 12,276 -964 -7.28 2,686 -11.67 0.0524
2020-02-14 2019-12-31 13F AMERICAN TOWER CORP COM 03027X100 13,240 1,808 15.82 3,041 20.29 0.0491
2019-11-05 2019-09-30 13F AMERICAN TOWER CORP COM 03027X100 11,432 1,333 13.20 2,528 22.42 0.0453
2019-08-13 2019-06-30 13F AMERICAN TOWER CORP COM 03027X100 10,099 -6,456 -39.00 2,065 -36.64 0.0385
2019-05-13 2019-03-31 13F AMERICAN TOWER CORP COM 03027X100 16,555 1,744 11.78 3,259 39.10 0.0560
2019-01-29 2018-12-31 13F AMERICAN TOWER CORP COM 03027X100 14,811 910 6.55 2,343 15.99 0.0457
2018-11-13 2018-09-30 13F AMERICAN TOWER CORP COM 03027X100 13,901 319 2.35 2,020 3.17 0.0359
2018-08-02 2018-06-30 13F AMERICAN TOWER CORP COM 03027X100 13,582 861 6.77 1,958 5.90 0.0384
2018-05-04 2018-03-31 13F AMERICAN TOWER CORP COM 03027X100 12,721 -198 -1.53 1,849 0.33 0.0382
2018-02-08 2017-12-31 13F AMERICAN TOWER CORP COM 03027X100 12,919 384 3.06 1,843 7.59 0.0386
2017-11-08 2017-09-30 13F AMERICAN TOWER CORP COM 03027X100 12,535 -1,119 -8.20 1,713 -5.15 0.0336
2017-08-11 2017-06-30 13F AMERICAN TOWER CORPORATION REIT COM 03027X100 13,654 289 2.16 1,806 11.21 0.0408
2017-05-12 2017-03-31 13F AMERICAN TOWER CORPORATION REIT COM 03027X100 13,365 -3,543 -20.95 1,624 -8.97 0.0394
2017-02-15 2016-12-31 13F AMERICAN TOWER CORPORATION REIT COM 03027X100 16,908 597 3.66 1,784 -3.41 0.0405
2016-11-18 2016-09-30 13F/A-1 AMERICAN TOWER CORPORATION REIT COM 03027X100 16,311 -2,464 -13.12 1,847 -13.37 0.0460
2016-11-14 2016-09-30 13F AMERICAN TOWER CORPORATION REIT COM 03027X100 16,311 1,847
2016-08-13 2016-06-30 13F AMERICAN TOWER CORPORATION REIT COM 03027X100 18,775 373 2.03 2,132 13.28 0.0627
2016-05-13 2016-03-31 13F AMERICAN TOWER CORPORATION REIT COM 03027X100 18,402 -71 -0.38 1,882 5.20 0.0586
2016-02-12 2015-12-31 13F AMERICAN TOWER CORPORATION REIT COM 03027X100 18,473 3,165 20.68 1,789 33.01 0.0583
2015-11-13 2015-09-30 13F AMERICAN TOWER CORPORATION REIT COM 03027X100 15,308 53 0.35 1,345 -5.35 0.0471
2015-08-14 2015-06-30 13F AMERICAN TOWER CORPORATION REIT COM 03027X100 15,255 44 0.29 1,421 -0.56 0.0467
2015-05-06 2015-03-31 13F AMERICAN TOWER CORPORATION REIT COM 03027X100 15,211 858 5.98 1,429 0.99 0.0469
2015-02-12 2014-12-31 13F AMERICAN TOWER CORPORATION REIT COM 03027X100 14,353 1,320 10.13 1,415 16.17 0.0463
2014-11-12 2014-09-30 13F AMERICAN TOWER CORPORATION REIT COM 03027X100 13,033 129 1.00 1,218 5.09 0.0413
2014-07-29 2014-06-30 13F AMERICAN TOWER CORPORATION REIT COM 03027X100 12,904 1,467 12.83 1,159 24.22 0.0393
2014-05-05 2014-03-31 13F AMERICAN TOWER CORPORATION REIT COM 03027X100 11,437 633 5.86 933 8.61 0.0334
2014-02-13 2013-12-31 13F/A-1 AMERICAN TOWER CORPORATION REIT COM 03027X100 10,804 1,035 10.59 859 19.31 0.0321
2014-02-12 2013-12-31 13F AMERICAN TOWER CORPORATION REIT COM 03027X100 10,804 859
2013-11-14 2013-09-30 13F AMERICAN TOWER CORPORATION REIT COM 03027X100 9,769 2,495 34.30 720 36.11 0.0324
2013-08-16 2013-06-30 13F AMERICAN TOWER CORPORATION REIT COM 03027X100 7,274 7,274 529 0.0255
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.