American Tower Corporation
US ˙ NYSE ˙ US03027X1000

SecurityAMT / American Tower Corporation
InstitutionLevel Four Advisory Services, Llc
Latest Disclosed Ownership36,938 shares
Latest Disclosed Value $ 6,374,923
Level Four Advisory Services, Llc reports 21.02% increase in ownership of AMT / American Tower Corporation

On May 14, 2026 - Level Four Advisory Services, Llc filed a 13F-HR form disclosing ownership of 36,938 shares of American Tower Corporation (US:AMT) valued at $6,374,760 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 30,521 shares of American Tower Corporation. This represents a change in shares of 21.02% during the quarter. The current value of the position is $6,731,581 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)
2026-05-14 2026-03-31 13F AMERICAN TOWER COM 03027X100 36,938 6,417 21.02 6,375 18.96 0.2093
2026-02-13 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 30,521 902 3.05 5,359 -5.93 0.1753
2025-11-12 2025-09-30 13F AMERICAN TOWER CORP COM 03027X100 29,619 47 0.16 5,696 -12.85 0.1950
2025-08-13 2025-06-30 13F AMERICAN TOWER CORP COM 03027X100 29,572 343 1.17 6,536 2.77 0.2409
2025-05-14 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 29,229 -51 -0.17 6,360 18.44 0.2616
2025-02-12 2024-12-31 13F AMERICAN TOWER CORP COM 03027X100 29,280 621 2.17 5,370 -12.24 0.2195
2024-11-14 2024-09-30 13F AMERICAN TOWER CORP COM 03027X100 28,659 2,258 8.55 6,120 19.26 0.2576
2024-08-09 2024-06-30 13F AMERICAN TOWER CORP COM 03027X100 26,401 22,093 512.84 5,132 452.31 0.2313
2024-05-13 2024-03-31 13F AMERICAN TOWER CORP COM 03027X100 4,308 0 0.00 930 0.00 0.0511
2024-02-08 2023-12-31 13F AMERICAN TOWER CORP COM 03027X100 4,308 627 17.03 930 53.55 0.0522
2023-11-13 2023-09-30 13F AMERICAN TOWER CORP COM 03027X100 3,681 -1,589 -30.15 605 -40.80 0.0390
2023-07-10 2023-06-30 13F AMERICAN TOWER CORP COM 03027X100 5,270 78 1.50 1,022 -3.58 0.0614
2023-06-05 2023-03-31 13F AMERICAN TOWER CORP COM 03027X100 5,192 1,493 40.36 1,061 35.38 0.0696
2023-02-13 2022-12-31 13F AMERICAN TOWER CORP COM 03027X100 3,699 647 21.20 784 19.54 0.0582
2022-11-07 2022-09-30 13F AMERICAN TOWER CORP COM 03027X100 3,052 596 24.27 655 4.30 0.0637
2022-08-08 2022-06-30 13F AMERICAN TOWER CORP COM 03027X100 2,456 -274 -10.04 628 -8.45 0.0592
2022-05-10 2022-03-31 13F AMERICAN TOWER CORP COM 03027X100 2,730 78 2.94 686 -11.60 0.0537
2022-02-11 2021-12-31 13F AMERICAN TOWER CORP COM 03027X100 2,652 1,233 86.89 776 105.84 0.0592
2021-10-12 2021-09-30 13F AMERICAN TOWER CORP COM 03027X100 1,419 -2,301 -61.85 377 -62.49 0.0392
2021-08-09 2021-06-30 13F AMERICAN TOWER CORP COM 03027X100 3,720 -465 -11.11 1,005 0.50 0.0695
2021-05-10 2021-03-31 13F AMERICAN TOWER CORP COM 03027X100 4,185 71 1.73 1,000 8.34 0.0777
2021-02-10 2020-12-31 13F AMERICAN TOWER CORP COM 03027X100 4,114 -220 -5.08 923 -11.93 0.0741
2020-11-02 2020-09-30 13F AMERICAN TOWER CORP COM 03027X100 4,334 -1,344 -23.67 1,048 -28.66 0.0807
2020-08-17 2020-06-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 5,678 -205 -3.48 1,469 14.77 0.1136
2020-05-13 2020-03-31 13F AMERICAN TOWER CORP COM 03027X100 5,883 566 10.65 1,280 -74.09 0.1535
2020-02-13 2019-12-31 13F AMERICAN TOWER CORP COM 03027X100 5,317 73 1.39 4,941 326.32 0.1956
2019-11-12 2019-09-30 13F AMERICAN TOWER CORP COM 03027X100 5,244 205 4.07 1,159 12.42 0.1199
2019-08-14 2019-06-30 13F AMERICAN TOWER CORP COM 03027X100 5,039 -215 -4.09 1,031 -0.48 0.1041
2019-05-15 2019-03-31 13F AMERICAN TOWER CORP COM 03027X100 5,254 -1,003 -16.03 1,036 4.65 0.1141
2019-02-07 2018-12-31 13F AMERICAN TOWER CORP COM 03027X100 6,257 -2,685 -30.03 990 -23.79 0.1234
2018-11-14 2018-09-30 13F AMERICAN TOWER CORP COM 03027X100 8,942 15 0.17 1,299 0.93 0.1404
2018-08-14 2018-06-30 13F AMERICAN TOWER CORP COM 03027X100 8,927 3,342 59.84 1,287 58.50 0.0938
2018-05-14 2018-03-31 13F AMERICAN TOWER CORP COM 03027X100 5,585 52 0.94 812 2.92 0.0630
2018-02-13 2017-12-31 13F AMERICAN TOWER CORP COM 03027X100 5,533 -2,075 -27.27 789 -24.13 0.0614
2018-04-03 2017-09-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 7,608 -386 -4.83 1,040 7.88 0.0922
2017-11-15 2017-09-30 13F AMERICAN TOWER CORP COM 03027X100 7,901 -93 1,090
2017-09-20 2017-06-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 7,994 -127 -1.56 964 -1.63 0.1484
2017-07-12 2017-06-30 13F AMERICAN TOWER CORP COM 03027X100 7,994 964
2017-09-20 2017-03-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 8,121 84 1.05 980 15.43 0.0998
2017-05-15 2017-03-31 13F AMERICAN TOWER CORP COM 03027X100 8,121 84 980
2017-02-14 2016-12-31 13F AMERICAN TOWER CORP COM 03027X100 8,037 8,037 849 0.1084
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.