American Tower Corporation
US ˙ NYSE ˙ US03027X1000

SecurityAMT / American Tower Corporation
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership55,926 shares
Latest Disclosed Value $ 9,662,697
Advisor Group Holdings, Inc. reports 6.18% decrease in ownership of AMT / American Tower Corporation

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 55,926 shares of American Tower Corporation (US:AMT) valued at $9,651,709 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 59,613 shares of American Tower Corporation. This represents a change in shares of -6.18% during the quarter. The current value of the position is $10,856,355 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 55,926 -3,687 -6.18 9,663 -7.80 0.0082
2026-02-17 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 59,613 -9,533 -13.79 10,480 -23.62 0.0153
2025-11-14 2025-09-30 13F AMERICAN TOWER CORP COM 03027X100 69,146 -4,445 -6.04 13,720 -15.44 0.0192
2025-09-04 2025-06-30 13F/A-1 MERICAN TOWER CORP COM 03027X100 73,591 17,281 30.69 16,225 32.27 0.0289
2025-08-13 2025-06-30 13F MERICAN TOWER CORP COM 03027X100 67,855 11,545 13,527 0.0156
2025-05-12 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 56,310 -15,178 -21.23 12,268 4.74 0.0273
2025-06-06 2024-12-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 71,488 -8,984 -11.16 11,712 -37.46 0.0263
2025-02-07 2024-12-31 13F AMERICAN TOWER CORP COM 03027X100 70,510 -9,962 13,355 0.0341
2024-11-13 2024-09-30 13F AMERICAN TOWER CORP COM 03027X100 80,472 -13,934 -14.76 18,729 1.99 0.0422
2024-08-13 2024-06-30 13F AMERICAN TOWER CORP COM 03027X100 94,406 4,291 4.76 18,364 3.09 0.0434
2024-05-10 2024-03-31 13F AMERICAN TOWER CORP COM 03027X100 90,115 -96,621 -51.74 17,813 -55.87 0.0398
2024-02-12 2023-12-31 13F AMERICAN TOWER CORP COM 03027X100 186,736 -34,819 -15.72 40,361 10.68 0.0706
2023-11-13 2023-09-30 13F AMERICAN TOWER CORP COM 03027X100 221,555 51,624 30.38 36,468 10.55 0.0539
2023-08-21 2023-06-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 169,931 15,146 9.79 32,989 4.02 0.0592
2023-08-10 2023-06-30 13F AMERICAN TOWER CORP COM 03027X100 593,820 439,035 32,565 0.0088
2023-05-12 2023-03-31 13F AMERICAN TOWER CORP COM 03027X100 154,785 43 0.03 31,713 -3.38 0.0597
2023-02-10 2022-12-31 13F AMERICAN TOWER CORP COM 03027X100 154,742 3,334 2.20 32,824 0.86 0.0665
2022-11-14 2022-09-30 13F AMERICAN TOWER CORP COM 03027X100 151,408 1,327 0.88 32,543 -15.31 0.0744
2022-08-10 2022-06-30 13F AMERICAN TOWER CORP COM 03027X100 150,081 -4,115 -2.67 38,424 6.42 0.0847
2022-05-04 2022-03-31 13F AMERICAN TOWER CORP COM 03027X100 154,196 13,547 9.63 36,106 -12.16 0.0701
2022-02-03 2021-12-31 13F AMERICAN TOWER CORP COM 03027X100 140,649 9,491 7.24 41,104 17.96 0.0778
2021-11-05 2021-09-30 13F AMERICAN TOWER CORP COM 03027X100 131,158 6,308 5.05 34,845 3.25 0.0726
2021-08-02 2021-06-30 13F AMERICAN TOWER CORP COM 03027X100 124,850 5,398 4.52 33,748 18.09 0.0731
2021-05-13 2021-03-31 13F AMERICAN TOWER CORP COM 03027X100 119,452 8,545 7.70 28,578 14.74 0.0688
2021-02-10 2020-12-31 13F AMERICAN TOWER CORP COM 03027X100 110,907 -11,346 -9.28 24,906 -16.33 0.0665
2020-11-12 2020-09-30 13F AMERICAN TOWER CORP COM 03027X100 122,253 6,584 5.69 29,768 -0.59 0.0891
2020-08-14 2020-06-30 13F AMERICAN TOWER CORP COM 03027X100 115,669 -17,783 -13.33 29,946 33.08 0.1005
2020-05-18 2020-03-31 13F AMERICAN TOWER CORP COM 03027X100 133,452 133,452 22,503 0.0921
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.