American Tower Corporation
US ˙ NYSE ˙ US03027X1000

SecurityAMT / American Tower Corporation
Institution1st Source Bank
Latest Disclosed Ownership2,255 shares
Latest Disclosed Value $ 389,168
1st Source Bank reports 2.47% decrease in ownership of AMT / American Tower Corporation

On May 4, 2026 - 1st Source Bank filed a 13F-HR form disclosing ownership of 2,255 shares of American Tower Corporation (US:AMT) valued at $389,168 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 2,312 shares of American Tower Corporation. This represents a change in shares of -2.47% during the quarter. The current value of the position is $410,951 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)
2026-05-04 2026-03-31 13F AMERICAN TOWER COM 03027X100 2,255 -57 -2.47 389 -3.95 0.0201
2026-02-05 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 2,312 20 0.87 406 -7.95 0.0213
2025-11-12 2025-09-30 13F AMERICAN TOWER CORP COM 03027X100 2,292 -30 -1.29 441 -14.23 0.0232
2025-08-07 2025-06-30 13F AMERICAN TOWER CORP COM 03027X100 2,322 -26 -1.11 513 0.59 0.0283
2025-05-05 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 2,348 -23 -0.97 511 17.51 0.0301
2025-02-10 2024-12-31 13F American Tower COM 03027X100 2,371 250 11.79 435 -11.97 0.0249
2024-12-11 2024-09-30 13F American Tower COM 03027X100 2,121 400 23.24 493 47.60 0.0278
2024-08-08 2024-06-30 13F AMERICAN TOWER CORP REIT COM 03027X100 1,721 -114 -6.21 335 -7.73 0.0196
2024-05-09 2024-03-31 13F AMERICAN TOWER CORP REIT COM 03027X100 1,835 -315 -14.65 363 -21.98 0.0211
2024-02-08 2023-12-31 13F AMERICAN TOWER CORP REIT COM 03027X100 2,150 -6 -0.28 464 31.07 0.0280
2023-11-09 2023-09-30 13F AMERICAN TOWER CORP REIT COM 03027X100 2,156 318 17.30 355 -0.56 0.0241
2023-08-09 2023-06-30 13F AMERICAN TOWER CORP REIT COM 03027X100 1,838 -19 -1.02 356 -6.07 0.0230
2023-05-09 2023-03-31 13F AMERICAN TOWER CORP REIT COM 03027X100 1,857 5 0.27 379 -3.32 0.0252
2023-02-13 2022-12-31 13F AMERICAN TOWER CORP REIT COM 03027X100 1,852 -15 -0.80 392 -2.24 0.0258
2022-11-04 2022-09-30 13F AMERICAN TOWER CORP REIT COM 03027X100 1,867 66 3.66 401 -12.83 0.0292
2022-08-05 2022-06-30 13F AMERICAN TOWER CORP REIT COM 03027X100 1,801 -57 -3.07 460 -1.50 0.0325
2022-05-05 2022-03-31 13F AMERICAN TOWER CORP REIT COM 03027X100 1,858 24 1.31 467 -12.87 0.0287
2022-02-09 2021-12-31 13F AMERICAN TOWER CORP REIT COM 03027X100 1,834 209 12.86 536 24.36 0.0314
2021-11-05 2021-09-30 13F AMERICAN TOWER CORP REIT COM 03027X100 1,625 0 0.00 431 -1.82 0.0272
2021-08-03 2021-06-30 13F AMERICAN TOWER CORP REIT COM 03027X100 1,625 2 0.12 439 13.14 0.0277
2021-05-07 2021-03-31 13F AMERICAN TOWER CORP REIT COM 03027X100 1,623 0 0.00 388 6.59 0.0257
2021-02-05 2020-12-31 13F AMERICAN TOWER CORP REIT COM 03027X100 1,623 0 0.00 364 -7.14 0.0265
2020-10-30 2020-09-30 13F AMERICAN TOWER CORP REIT COM 03027X100 1,623 -40 -2.41 392 -8.84 0.0334
2020-08-07 2020-06-30 13F AMERICAN TOWER CORP REIT COM 03027X100 1,663 97 6.19 430 26.10 0.0370
2020-04-29 2020-03-31 13F AMERICAN TOWER CORP REIT COM 03027X100 1,566 290 22.73 341 16.38 0.0343
2020-01-27 2019-12-31 13F AMERICAN TOWER CORP REIT COM 03027X100 1,276 51 4.16 293 8.12 0.0219
2019-11-06 2019-09-30 13F AMERICAN TOWER CORP REIT COM 03027X100 1,225 0 0.00 271 8.40 0.0222
2019-07-29 2019-06-30 13F AMERICAN TOWER CORP REIT COM 03027X100 1,225 0 0.00 250 3.73 0.0204
2019-04-29 2019-03-31 13F AMERICAN TOWER CORP REIT COM 03027X100 1,225 1,225 241 0.0206
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.