American Tower Corporation
US ˙ NYSE ˙ US03027X1000

SecurityAMT / American Tower Corporation
InstitutionAdvisory Services Network, LLC
Latest Disclosed Ownership43,181 shares
Latest Disclosed Value $ 7,452,093
Advisory Services Network, LLC reports 24.60% increase in ownership of AMT / American Tower Corporation

On May 15, 2026 - Advisory Services Network, LLC filed a 13F-HR form disclosing ownership of 43,181 shares of American Tower Corporation (US:AMT) valued at $7,452,177 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 34,656 shares of American Tower Corporation. This represents a change in shares of 24.60% during the quarter. The current value of the position is $8,373,228 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 CORP COM REIT 03027X100 43,181 8,525 24.60 7,452 22.49 0.0689
2026-02-17 2025-12-31 13F AMERICAN TOWER CORP COM REIT 03027X100 34,656 -1,056 -2.96 6,085 -11.42 0.0861
2025-11-18 2025-09-30 13F AMERICAN TOWER CORP REIT 03027X100 35,712 1,283 3.73 6,868 -4.27 0.1007
2025-08-19 2025-06-30 13F AMERICAN TOWER CORP REIT 03027X100 34,429 6,489 23.22 7,175 18.01 0.1155
2025-05-15 2025-03-31 13F AMERICAN TOWER CORP REIT 03027X100 27,940 -1,405 -4.79 6,080 12.95 0.1168
2025-02-13 2024-12-31 13F AMERICAN TOWER CORP REIT 03027X100 29,345 -4,973 -14.49 5,382 -19.31 0.1003
2024-11-14 2024-09-30 13F AMERICAN TOWER CORP REIT 03027X100 34,318 0 0.00 6,671 0.00 0.1379
2024-08-13 2024-06-30 13F AMERICAN TOWER CORP REIT 03027X100 34,318 2,569 8.09 6,671 6.33 0.1379
2024-05-06 2024-03-31 13F AMERICAN TOWER CORP REIT 03027X100 31,749 4,775 17.70 6,273 7.73 0.1391
2024-02-09 2023-12-31 13F AMERICAN TOWER CORP REIT 03027X100 26,974 -2,589 -8.76 5,823 19.79 0.1423
2023-11-14 2023-09-30 13F AMERICAN TOWER CORP REIT 03027X100 29,563 -98,149 -76.85 4,862 -80.37 0.1306
2023-08-09 2023-06-30 13F AMERICAN TOWER CORP REIT 03027X100 127,712 102,121 399.05 24,768 373.67 0.6599
2023-05-17 2023-03-31 13F AMERICAN TOWER CORP REIT 03027X100 25,591 -493 -1.89 5,229 -5.37 0.1449
2023-02-13 2022-12-31 13F AMERICAN TOWER CORP REIT 03027X100 26,084 -389 -1.47 5,526 -2.76 0.1694
2022-11-14 2022-09-30 13F AMERICAN TOWER CORP REIT 03027X100 26,473 -1,922 -6.77 5,683 -21.69 0.2006
2022-08-02 2022-06-30 13F AMERICAN TOWER CORP REIT 03027X100 28,395 764 2.77 7,257 4.54 0.2482
2022-05-23 2022-03-31 13F AMERICAN TOWER CORP REIT 03027X100 27,631 6,185 28.84 6,942 10.66 0.2043
2022-02-14 2021-12-31 13F AMERICAN TOWER CORP REIT 03027X100 21,446 1,424 7.11 6,273 18.05 0.1805
2021-11-05 2021-09-30 13F AMERICAN TOWER CORP REIT 03027X100 20,022 2,177 12.20 5,314 10.23 0.1690
2021-08-12 2021-06-30 13F AMERICAN TOWER CORP REIT 03027X100 17,845 3,085 20.90 4,821 36.61 0.1521
2021-05-24 2021-03-31 13F AMERICAN TOWER CORP REIT 03027X100 14,760 -2,377 -13.87 3,529 -8.27 0.1311
2021-02-09 2020-12-31 13F AMERICAN TOWER CORP REIT 03027X100 17,137 6,416 59.85 3,847 48.48 0.1544
2020-11-16 2020-09-30 13F AMERICAN TOWER CORP REIT 03027X100 10,721 -35 -0.33 2,591 -6.80 0.1219
2020-08-10 2020-06-30 13F AMERICAN TOWER REIT 03027X100 10,756 771 7.72 2,780 27.87 0.1526
2020-05-15 2020-03-31 13F AMERICAN TOWER CORP REIT 03027X100 9,985 524 5.54 2,174 0.00 0.1422
2020-02-04 2019-12-31 13F AMERICAN TOWER CORP REIT 03027X100 9,461 -719 -7.06 2,174 4.42 0.1143
2019-11-04 2019-09-30 13F AMERICAN TOWER CORP REIT 03027X100 10,180 0 0.00 2,082 0.00 0.1275
2019-08-01 2019-06-30 13F AMERICAN TOWER CORP REIT 03027X100 10,180 1,094 12.04 2,082 16.31 0.1277
2019-05-20 2019-03-31 13F AMERICAN TOWER CORP REIT 03027X100 9,086 3,797 71.79 1,790 113.86 0.1257
2019-02-15 2018-12-31 13F AMERICAN TOWER CORP REIT 03027X100 5,289 -355 -6.29 837 2.07 0.0731
2018-11-02 2018-09-30 13F AMERICAN TOWER CORP REIT 03027X100 5,644 -418 -6.90 820 -6.39 0.0598
2018-07-27 2018-06-30 13F AMERICAN TOWER CORP REIT 03027X100 6,062 -689 -10.21 876 -10.70 0.0667
2018-04-23 2018-03-31 13F AMERICAN TOWER CORP REIT 03027X100 6,751 -1,875 -21.74 981 -20.31 0.0784
2018-02-08 2017-12-31 13F AMERICAN TOWER CORP REIT 03027X100 8,626 -794 -8.43 1,231 -4.43 0.1073
2017-10-12 2017-09-30 13F AMERICAN TOWER CORP REIT 03027X100 9,420 -2,024 -17.69 1,288 -14.93 0.1474
2017-08-17 2017-06-30 13F AMERICAN TOWER CORP NEW COM REIT 03027X100 11,444 185 1.64 1,514 10.67 0.1973
2017-04-28 2017-03-31 13F AMERICAN TOWER CORP NEW COM REIT 03027X100 11,259 7,431 194.12 1,368 215.21 0.1987
2016-10-07 2016-09-30 13F AMERICAN TOWER CORP REIT 03027X100 3,828 9 0.24 434 0.00 0.0816
2016-07-27 2016-06-30 13F AMERICAN TOWER CORP REIT 03027X100 3,819 115 3.10 434 14.51 0.0987
2016-04-21 2016-03-31 13F AMERICAN TOWER CORP REIT 03027X100 3,704 206 5.89 379 11.80 0.1035
2016-01-27 2015-12-31 13F AMERICAN TOWER CORP NEW COM REIT 03027X100 3,498 3,200 1,073.83 339 1,203.85 0.1090
2015-10-01 2015-09-30 13F AMERICAN TOWER REIT 03027X100 298 -32 -9.70 26 -16.13 0.0078
2015-07-02 2015-06-30 13F AMERICAN TOWER REIT 03027X100 330 26 8.55 31 3.33 0.0091
2015-04-08 2015-03-31 13F AMERICAN TOWER REIT 03027X100 304 60 24.59 30 25.00 0.0083
2015-01-23 2014-12-31 13F AMERICAN TOWER REIT 03027X100 244 175 253.62 24 300.00 0.0075
2014-02-13 2013-12-31 13F AMERICAN TOWER CORP REIT 03027X100 69 69 6 0.0030
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.