American Tower Corporation
US ˙ NYSE ˙ US03027X1000

SecurityAMT / American Tower Corporation
InstitutionCerity Partners LLC
Latest Disclosed Ownership106,738 shares
Latest Disclosed Value $ 18,421,168
Cerity Partners LLC reports 30.78% decrease in ownership of AMT / American Tower Corporation

On May 15, 2026 - Cerity Partners LLC filed a 13F-HR form disclosing ownership of 106,738 shares of American Tower Corporation (US:AMT) valued at $18,420,844 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 154,204 shares of American Tower Corporation. This represents a change in shares of -30.78% during the quarter. The current value of the position is $19,451,933 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 106,738 -47,466 -30.78 18,421 -31.96 0.0129
2026-02-11 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 154,204 28,679 22.85 27,073 12.15 0.0395
2025-10-22 2025-09-30 13F AMERICAN TOWER CORP REIT 03027X100 125,525 -1,711 -1.34 24,141 -14.16 0.0391
2025-08-13 2025-06-30 13F AMERICAN TOWER CORP REIT 03027X100 127,236 46,005 56.63 28,122 59.11 0.0501
2025-04-30 2025-03-31 13F AMERICAN TOWER CORP REIT 03027X100 81,231 -8,228 -9.20 17,676 -3.37 0.0358
2025-02-13 2024-12-31 13F AMERICAN TOWER CORP REIT 03027X100 89,459 -39,775 -30.78 18,291 -39.14 0.0397
2024-11-12 2024-09-30 13F AMERICAN TOWER CORP Stock 03027X100 129,234 34,670 36.66 30,055 63.51 0.0665
2024-08-13 2024-06-30 13F AMERICAN TOWER CORP COM 03027X100 94,564 -37,920 -28.62 18,382 -27.63 0.0484
2024-05-14 2024-03-31 13F AMERICAN TOWER CORP COM 03027X100 132,484 47,655 56.18 25,400 38.69 0.0671
2024-01-26 2023-12-31 13F AMERICAN TOWER CORP COM 03027X100 84,829 31,410 58.80 18,314 108.49 0.0602
2023-11-14 2023-09-30 13F AMERICAN TOWER CORP COM 03027X100 53,419 -30,892 -36.64 8,785 -46.28 0.0427
2023-08-14 2023-06-30 13F AMERICAN TOWER CORP COM 03027X100 84,311 8,041 10.54 16,352 0.83 0.0637
2023-05-11 2023-03-31 13F AMERICAN TOWER CORP COM 03027X100 76,270 29,991 64.80 16,218 60.84 0.0382
2023-02-15 2022-12-31 13F AMERICAN TOWER CORP COM 03027X100 46,279 7,371 18.94 10,084 20.71 0.0646
2022-11-14 2022-09-30 13F AMERICAN TOWER CORP COM 03027X100 38,908 2,036 5.52 8,353 -11.37 0.1004
2022-08-10 2022-06-30 13F AMERICAN TOWER CORP COM 03027X100 36,872 1,639 4.65 9,425 9.49 0.1042
2022-04-25 2022-03-31 13F AMERICAN TOWER CORP COM 03027X100 35,233 4,279 13.82 8,608 -4.92 0.1337
2022-02-14 2021-12-31 13F AMERICAN TOWER CORP Stock 03027X100 30,954 4,714 17.96 9,053 30.00 0.1378
2021-10-25 2021-09-30 13F American Tower Corp REIT REIT 03027X100 26,240 82 0.31 6,964 -1.44 0.1532
2021-08-11 2021-06-30 13F AMERICAN TOWER CORP REIT 03027X100 26,158 -32,480 -55.39 7,066 -49.59 0.1546
2021-08-11 2021-03-31 13F/A-1 AMERICAN TOWER CORP REIT 03027X100 58,638 12,353 26.69 14,018 34.93 0.3330
2021-05-12 2021-03-31 13F AMERICAN TOWER CORP REIT 03027X100 27,908 -18,377 6,672 0.1976
2021-02-11 2020-12-31 13F AMERICAN TOWER CORP REIT 03027X100 46,285 714 1.57 10,389 -5.69 0.3331
2020-11-12 2020-09-30 13F AMERICAN TOWER CORP COM 03027X100 45,571 21,132 86.47 11,016 74.33 0.4532
2020-08-17 2020-06-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 24,439 17,468 250.58 6,319 316.27 0.3491
2020-08-14 2020-06-30 13F AMERICAN TOWER CORP COM 03027X100 24,439 17,468 6,319 348,507.9624
2020-05-14 2020-03-31 13F AMERICAN TOWER CORP COM 03027X100 6,971 -476 -6.39 1,518 -11.33 0.0956
2020-02-14 2019-12-31 13F AMERICAN TOWER CORP COM 03027X100 7,447 -1,362 -15.46 1,712 -12.11 0.0873
2019-10-30 2019-09-30 13F AMERICAN TOWER CORP COM 03027X100 8,809 762 9.47 1,948 18.42 0.1143
2019-08-14 2019-06-30 13F AMERICAN TOWER CORP COM 03027X100 8,047 -6,871 -46.06 1,645 -44.05 0.1037
2019-05-14 2019-03-31 13F AMERICAN TOWER CORP COM 03027X100 14,918 -3,819 -20.38 2,940 -0.81 0.1979
2019-02-06 2018-12-31 13F AMERICAN TOWER CORP COM 03027X100 18,737 5,016 36.56 2,964 48.65 0.1985
2018-11-15 2018-09-30 13F AMERICAN TOWER CORP COM 03027X100 13,721 456 3.44 1,994 4.29 0.1381
2018-08-15 2018-06-30 13F AMERICAN TOWER CORP COM 03027X100 13,265 969 7.88 1,912 6.99 0.1413
2018-05-15 2018-03-31 13F AMERICAN TOWER CORP COM 03027X100 12,296 -643 -4.97 1,787 -3.20 0.1367
2018-02-14 2017-12-31 13F American Tower REIT COM 03027X100 12,939 322 2.55 1,846 7.01 0.1239
2017-11-13 2017-09-30 13F AMERICAN TOWER CORP COM 03027X100 12,617 779 6.58 1,725 10.15 0.1221
2017-08-10 2017-06-30 13F American Tower REIT COM 03027X100 11,838 1,808 18.03 1,566 28.47 0.1312
2017-05-02 2017-03-31 13F American Tower REIT COM 03027X100 10,030 10,030 1,219 0.1018
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.