American Tower Corporation
US ˙ NYSE ˙ US03027X1000

SecurityAMT / American Tower Corporation
InstitutionSignaturefd, Llc
Latest Disclosed Ownership7,041 shares
Latest Disclosed Value $ 1,215,142
Signaturefd, Llc reports 7.70% decrease in ownership of AMT / American Tower Corporation

On April 7, 2026 - Signaturefd, Llc filed a 13F-HR form disclosing ownership of 7,041 shares of American Tower Corporation (US:AMT) valued at $1,215,136 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 20, 2026 disclosing 7,628 shares of American Tower Corporation. This represents a change in shares of -7.70% during the quarter. The current value of the position is $1,366,799 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)
2026-04-07 2026-03-31 13F AMERICAN TOWER CORP COM 03027X100 7,041 -587 -7.70 1,215 -9.26 0.0186
2026-01-20 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 7,628 183 2.46 1,339 -6.43 0.0205
2025-10-21 2025-09-30 13F AMERICAN TOWER CORP COM 03027X100 7,445 -1,681 -18.42 1,432 -29.02 0.0226
2025-07-16 2025-06-30 13F AMERICAN TOWER CORP COM 03027X100 9,126 1,125 14.06 2,017 15.80 0.0344
2025-05-02 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 8,001 1,536 23.76 1,741 46.92 0.0330
2025-02-10 2024-12-31 13F AMERICAN TOWER CORP COM 03027X100 6,465 -1,539 -19.23 1,186 -36.32 0.0225
2024-10-21 2024-09-30 13F AMERICAN TOWER CORP COM 03027X100 8,004 585 7.89 1,861 29.06 0.0355
2024-07-29 2024-06-30 13F AMERICAN TOWER CORP COM 03027X100 7,419 -236 -3.08 1,442 -4.63 0.0293
2024-05-03 2024-03-31 13F AMERICAN TOWER CORP COM 03027X100 7,655 30 0.39 1,513 -8.14 0.0319
2024-02-01 2023-12-31 13F AMERICAN TOWER CORP COM 03027X100 7,625 -127 -1.64 1,646 29.20 0.0380
2023-11-03 2023-09-30 13F AMERICAN TOWER CORP COM 03027X100 7,752 1,095 16.45 1,275 -1.32 0.0332
2023-08-01 2023-06-30 13F AMERICAN TOWER CORP COM 03027X100 6,657 -122 -1.80 1,291 -6.79 0.0330
2023-04-28 2023-03-31 13F AMERICAN TOWER CORP COM 03027X100 6,779 268 4.12 1,385 0.44 0.0378
2023-01-30 2022-12-31 13F AMERICAN TOWER CORP COM 03027X100 6,511 -127 -1.91 1,379 -3.23 0.0403
2022-11-08 2022-09-30 13F AMERICAN TOWER CORP COM 03027X100 6,638 -446 -6.30 1,425 -21.31 0.0488
2022-08-10 2022-06-30 13F AMERICAN TOWER CORP COM 03027X100 7,084 946 15.41 1,811 17.44 0.0617
2022-05-02 2022-03-31 13F AMERICAN TOWER CORP COM 03027X100 6,138 633 11.50 1,542 -4.22 0.0464
2022-01-25 2021-12-31 13F AMERICAN TOWER CORP COM 03027X100 5,505 207 3.91 1,610 14.51 0.0495
2021-10-28 2021-09-30 13F AMERICAN TOWER CORP COM 03027X100 5,298 599 12.75 1,406 10.80 0.0486
2021-07-26 2021-06-30 13F AMERICAN TOWER CORP COM 03027X100 4,699 672 16.69 1,269 31.78 0.0506
2021-04-30 2021-03-31 13F AMERICAN TOWER CORP COM 03027X100 4,027 485 13.69 963 21.13 0.0426
2021-02-11 2020-12-31 13F AMERICAN TOWER CORP COM 03027X100 3,542 -593 -14.34 795 -20.50 0.0375
2020-11-03 2020-09-30 13F AMERICAN TOWER CORP COM 03027X100 4,135 -66 -1.57 1,000 -7.92 0.0535
2020-07-30 2020-06-30 13F AMERICAN TOWER CORP COM 03027X100 4,201 237 5.98 1,086 25.84 0.0656
2020-04-23 2020-03-31 13F AMERICAN TOWER CORP COM 03027X100 3,964 1,461 58.37 863 50.09 0.0746
2020-02-05 2019-12-31 13F AMERICAN TOWER CORP COM 03027X100 2,503 248 11.00 575 15.23 0.0425
2019-10-16 2019-09-30 13F AMERICAN TOWER CORP COM 03027X100 2,255 172 8.26 499 17.14 0.0410
2019-07-31 2019-06-30 13F AMERICAN TOWER CORP COM 03027X100 2,083 -5 -0.24 426 3.65 0.0369
2019-05-09 2019-03-31 13F AMERICAN TOWER CORP COM 03027X100 2,088 -385 -15.57 411 5.12 0.0350
2019-02-13 2018-12-31 13F AMERICAN TOWER CORP COM 03027X100 2,473 882 55.44 391 69.26 0.0364
2018-11-14 2018-09-30 13F AMERICAN TOWER CORP COM 03027X100 1,591 220 16.05 231 16.67 0.0235
2018-08-14 2018-06-30 13F AMERICAN TOWER CORP COM 03027X100 1,371 120 9.59 198 8.79 0.0221
2018-05-08 2018-03-31 13F AMERICAN TOWER CORP COM 03027X100 1,251 1,251 -8.75 182 -8.08 0.0213
2017-02-14 2016-12-31 13F AMERICAN TOWER CORP COM 03027X100 0 -580 -100.00 0 -100.00
2016-11-14 2016-09-30 13F AMERICAN TOWER CORP COM 03027X100 580 -14 -2.36 66 -1.49 0.0096
2016-07-29 2016-06-30 13F AMERICAN TOWER CORP COM 03027X100 594 134 29.13 67 42.55 0.0098
2016-05-12 2016-03-31 13F AMERICAN TOWER CORP COM 03027X100 460 -84 -15.44 47 -11.32 0.0080
2016-01-22 2015-12-31 13F AMERICAN TOWER CORP COM 03027X100 544 94 20.89 53 32.50 0.0103
2015-10-23 2015-09-30 13F AMERICAN TOWER CORP COM 03027X100 450 217 93.13 40 81.82 0.0091
2015-07-15 2015-06-30 13F AMERICAN TOWER CORP COM 03027X100 233 66 39.52 22 37.50 0.0048
2015-04-15 2015-03-31 13F AMERICAN TOWER CORP COM 03027X100 167 167 -28.33 16 -27.27 0.0039
2015-02-13 2014-12-31 13F AMERICAN TOWER CORP COM 03027X100 0 -100 -100.00 0 -100.00
2014-11-13 2014-09-30 13F AMERICAN TOWER CORP COM 03027X100 100 0 0.00 9 0.00 0.0029
2014-08-14 2014-06-30 13F AMERICAN TOWER CORP COM 03027X100 100 100 9 0.0031
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.