American Tower Corporation
US ˙ NYSE ˙ US03027X1000

SecurityAMT / American Tower Corporation
InstitutionRMR Wealth Builders
Latest Disclosed Ownership18,012 shares
Latest Disclosed Value $ 3,108,527
RMR Wealth Builders reports 36.83% increase in ownership of AMT / American Tower Corporation

On April 22, 2026 - RMR Wealth Builders filed a 13F-HR form disclosing ownership of 18,012 shares of American Tower Corporation (US:AMT) valued at $3,108,511 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 13,164 shares of American Tower Corporation. This represents a change in shares of 36.83% during the quarter. The current value of the position is $3,282,507 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)
2026-04-22 2026-03-31 13F AMERICAN TOWER COM 03027X100 18,012 4,848 36.83 3,109 34.49 0.2448
2026-01-29 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 13,164 930 7.60 2,311 -1.74 0.1849
2025-11-05 2025-09-30 13F AMERICAN TOWER CORP COM 03027X100 12,234 1,513 14.11 2,353 -0.72 0.1969
2025-07-08 2025-06-30 13F AMERICAN TOWER CORP COM 03027X100 10,721 465 4.53 2,370 6.19 0.2154
2025-04-16 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 10,256 1,258 13.98 2,232 35.21 0.2349
2025-01-14 2024-12-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 8,998 1,008 12.62 1,650 -11.19 0.1706
2025-01-10 2024-12-31 13F AMERICAN TOWER CORP COM 03027X100 8,998 1,008 1,650 0.1716
2024-10-21 2024-09-30 13F AMERICAN TOWER CORP COM 03027X100 7,990 -206 -2.51 1,858 16.64 0.1969
2024-07-23 2024-06-30 13F AMERICAN TOWER CORP COM 03027X100 8,196 1,531 22.97 1,593 21.05 0.1828
2024-04-15 2024-03-31 13F AMERICAN TOWER CORP COM 03027X100 6,665 1,014 17.94 1,317 7.96 0.1592
2024-02-06 2023-12-31 13F AMERICAN TOWER CORP COM 03027X100 5,651 1,231 27.85 1,220 67.91 0.1714
2023-10-23 2023-09-30 13F AMERICAN TOWER CORP COM 03027X100 4,420 2,595 142.19 727 103.93 0.1161
2023-07-21 2023-06-30 13F AMERICAN TOWER CORP COM 03027X100 1,825 50 2.82 357 -1.66 0.0607
2023-04-11 2023-03-31 13F AMERICAN TOWER CORP COM 03027X100 1,775 11 0.62 363 -2.95 0.0690
2023-02-15 2022-12-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 1,764 7 0.40 374 -1.06 0.0847
2022-11-08 2022-09-30 13F AMERICAN TOWER CORP COM 03027X100 1,757 62 3.66 377 -13.53 0.0922
2022-08-02 2022-06-30 13F AMERICAN TOWER CORP COM 03027X100 1,695 -484 -22.21 436 -20.29 0.1086
2022-05-13 2022-03-31 13F AMERICAN TOWER CORP COM 03027X100 2,179 1,416 185.58 547 144.20 0.1173
2022-02-02 2021-12-31 13F AMERICAN TOWER CORP COM 03027X100 763 -1,820 -70.46 224 -67.35 0.0643
2021-10-18 2021-09-30 13F AMERICAN TOWER CORP COM 03027X100 2,583 3 0.12 686 -2.00 0.2014
2021-08-16 2021-06-30 13F AMERICAN TOWER CORP NEW COM Real Estate Investment Trust 03027X100 2,580 -35 -1.34 700 12.00 0.2295
2021-05-13 2021-03-31 13F AMERICAN TOWER CORP COM 03027X100 2,615 209 8.69 625 15.74 0.1624
2021-02-26 2020-12-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 2,406 -264 -9.89 540 -16.28 0.2653
2021-02-09 2020-12-31 13F AMERICAN TOWER CORP COM 03027X100 1,848 -822 540 295,603.7158
2020-11-13 2020-09-30 13F AMERICAN TOWER CORP COM 03027X100 2,670 822 44.48 645 34.94 0.1675
2020-08-19 2020-06-30 13F AMERICAN TOWER CORP COM 03027X100 1,848 0 0.00 478 12.47 0.4261
2020-03-03 2019-12-31 13F AMERICAN TOWER CORP COM USD0.01 COM 03027X100 1,848 1,848 425 0.4094
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.