American Tower Corporation
US ˙ NYSE ˙ US03027X1000

SecurityAMT / American Tower Corporation
InstitutionCommerce Bank
Latest Disclosed Ownership34,344 shares
Latest Disclosed Value $ 5,927,087
Commerce Bank reports 118.18% increase in ownership of AMT / American Tower Corporation

On May 11, 2026 - Commerce Bank filed a 13F-HR form disclosing ownership of 34,344 shares of American Tower Corporation (US:AMT) valued at $5,927,088 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 15,741 shares of American Tower Corporation. This represents a change in shares of 118.18% during the quarter. The current value of the position is $6,659,645 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)
2026-05-11 2026-03-31 13F AMERICAN TOWER COM 03027X100 34,344 18,603 118.18 5,927 114.51 0.0122
2026-02-13 2025-12-31 13F AMERICAN TOWER COM 03027X100 15,741 -1,360 -7.95 2,764 -15.97 0.0153
2025-11-12 2025-09-30 13F AMERICAN TOWER CORP COM 03027X100 17,101 911 5.63 3,289 -8.11 0.0183
2025-08-07 2025-06-30 13F AMERICAN TOWER CORP COM 03027X100 16,190 -1,891 -10.46 3,578 -9.05 0.0211
2025-05-08 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 18,081 409 2.31 3,934 21.38 0.0251
2025-02-13 2024-12-31 13F AMERICAN TOWER CORP COM 03027X100 17,672 -496 -2.73 3,241 -23.29 0.0200
2024-11-08 2024-09-30 13F AMERICAN TOWER CORP COM 03027X100 18,168 245 1.37 4,225 21.30 0.0259
2024-08-12 2024-06-30 13F AMERICAN TOWER CORP COM 03027X100 17,923 -752 -4.03 3,484 -5.58 0.0226
2024-05-03 2024-03-31 13F AMERICAN TOWER CORP COM 03027X100 18,675 -3,753 -16.73 3,690 -23.80 0.0244
2024-02-09 2023-12-31 13F AMERICAN TOWER CORP COM 03027X100 22,428 2,609 13.16 4,842 48.54 0.0345
2023-11-14 2023-09-30 13F AMERICAN TOWER CORP COM 03027X100 19,819 -1,395 -6.58 3,259 -20.78 0.0257
2023-08-08 2023-06-30 13F AMERICAN TOWER CORP COM 03027X100 21,214 -6,595 -23.72 4,114 -27.60 0.0308
2023-05-04 2023-03-31 13F AMERICAN TOWER CORP COM 03027X100 27,809 304 1.11 5,682 -2.49 0.0445
2023-02-10 2022-12-31 13F AMERICAN TOWER CORP COM 03027X100 27,505 -116 -0.42 5,827 -1.74 0.0473
2022-11-04 2022-09-30 13F AMERICAN TOWER CORP COM 03027X100 27,621 -454 -1.62 5,930 -17.36 0.0515
2022-08-12 2022-06-30 13F AMERICAN TOWER CORP COM 03027X100 28,075 -1,695 -5.69 7,176 -4.05 0.0585
2022-05-09 2022-03-31 13F AMERICAN TOWER CORP COM 03027X100 29,770 -2,352 -7.32 7,479 -20.40 0.0512
2022-02-14 2021-12-31 13F AMERICAN TOWER CORP COM 03027X100 32,122 1,491 4.87 9,396 15.59 0.0614
2021-11-09 2021-09-30 13F AMERICAN TOWER CORP COM 03027X100 30,631 1,436 4.92 8,129 3.07 0.0575
2021-08-09 2021-06-30 13F AMERICAN TOWER CORP COM 03027X100 29,195 -1,272 -4.18 7,887 8.28 0.0560
2021-05-05 2021-03-31 13F AMERICAN TOWER CORP COM 03027X100 30,467 -864 -2.76 7,284 3.57 0.0554
2021-02-09 2020-12-31 13F AMERICAN TOWER CORP COM 03027X100 31,331 1,033 3.41 7,033 -3.97 0.0569
2020-11-06 2020-09-30 13F AMERICAN TOWER CORP COM 03027X100 30,298 4,372 16.86 7,324 9.26 0.0662
2020-08-07 2020-06-30 13F AMERICAN TOWER CORP COM 03027X100 25,926 1,676 6.91 6,703 26.95 0.0653
2020-05-08 2020-03-31 13F AMERICAN TOWER CORP COM 03027X100 24,250 1,306 5.69 5,280 0.13 0.0639
2020-02-14 2019-12-31 13F AMERICAN TOWER CORP COM 03027X100 22,944 642 2.88 5,273 6.91 0.0502
2019-11-12 2019-09-30 13F AMERICAN TOWER CORP COM 03027X100 22,302 1,692 8.21 4,932 17.04 0.0506
2019-08-07 2019-06-30 13F AMERICAN TOWER CORP COM 03027X100 20,610 2,322 12.70 4,214 16.93 0.0473
2019-05-08 2019-03-31 13F AMERICAN TOWER CORP COM 03027X100 18,288 -461 -2.46 3,604 21.51 0.0427
2019-02-11 2018-12-31 13F AMERICAN TOWER CORP COM 03027X100 18,749 1,156 6.57 2,966 16.04 0.0378
2018-11-02 2018-09-30 13F AMERICAN TOWER CORP COM 03027X100 17,593 -512 -2.83 2,556 -2.07 0.0304
2018-08-08 2018-06-30 13F AMERICAN TOWER CORP COM 03027X100 18,105 415 2.35 2,610 1.52 0.0332
2018-05-03 2018-03-31 13F AMERICAN TOWER CORP COM 03027X100 17,690 -850 -4.58 2,571 -2.80 0.0339
2018-02-12 2017-12-31 13F AMERICAN TOWER CORP COM 03027X100 18,540 366 2.01 2,645 6.48 0.0344
2017-11-07 2017-09-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 18,174 935 5.42 2,484 8.90 0.0338
2017-11-07 2017-09-30 13F AMERICAN TOWER CORP COM 03027X100 17,239 2,281
2017-08-08 2017-06-30 13F AMERICAN TOWER CORP COM 03027X100 17,239 274 1.62 2,281 10.67 0.0320
2017-05-05 2017-03-31 13F AMERICAN TOWER CORP COM 03027X100 16,965 -148 -0.86 2,061 13.99 0.0294
2017-02-08 2016-12-31 13F AMERICAN TOWER CORP COM 03027X100 17,113 -1,049 -5.78 1,808 -12.15 0.0270
2016-11-03 2016-09-30 13F AMERICAN TOWER CORP COM 03027X100 18,162 -1,077 -5.60 2,058 -5.86 0.0320
2016-08-09 2016-06-30 13F AMERICAN TOWER CORP COM 03027X100 19,239 -519 -2.63 2,186 8.06 0.0346
2016-04-27 2016-03-31 13F AMERICAN TOWER CORP COM 03027X100 19,758 -640 -3.14 2,023 2.28 0.0336
2016-02-12 2015-12-31 13F AMERICAN TOWER CORP COM 03027X100 20,398 -577 -2.75 1,978 7.21 0.0331
2015-11-10 2015-09-30 13F AMERICAN TOWER CORP COM 03027X100 20,975 -56 -0.27 1,845 -5.96 0.0317
2015-08-03 2015-06-30 13F AMERICAN TOWER CORP COM 03027X100 21,031 268 1.29 1,962 0.36 0.0307
2015-05-06 2015-03-31 13F AMERICAN TOWER CORP COM 03027X100 20,763 -664 -3.10 1,955 -7.70 0.0304
2015-02-11 2014-12-31 13F AMERICAN TOWER CORP COM 03027X100 21,427 529 2.53 2,118 8.28 0.0335
2014-11-06 2014-09-30 13F AMERICAN TOWER CORP COM 03027X100 20,898 -547 -2.55 1,956 1.35 0.0323
2014-08-05 2014-06-30 13F AMERICAN TOWER CORP COM 03027X100 21,445 -931 -4.16 1,930 5.35 0.0315
2014-05-09 2014-03-31 13F AMERICAN TOWER CORP COM 03027X100 22,376 -1,001 -4.28 1,832 -1.82 0.0312
2014-02-14 2013-12-31 13F AMERICAN TOWER CORP COM 03027X100 23,377 -1,093 -4.47 1,866 2.87 0.0323
2013-11-05 2013-09-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 24,470 -2,390 1,814 0.0327
2013-11-05 2013-09-30 13F/A-2 AMERICAN TOWER CORP COM 03027X100 24,470 -2,390 -8.90 1,814 -7.68 0.0327
2013-11-04 2013-09-30 13F AMERICAN TOWER CORP COM 03027X100 24,470 1,814
2013-08-07 2013-06-30 13F AMERICAN TOWER CORP COM 03027X100 26,860 -2,800 -9.44 1,965 -13.89 0.0365
2013-08-08 2013-03-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 29,660 29,660 2,282 0.0445
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.