American Tower Corporation
MX ˙ BMV ˙ US03027X1000
SecurityMX:AMT / American Tower Corporation
InstitutionMagellan Asset Management Ltd
ManagerHamish Douglass
Latest Disclosed Ownership1,503,296 shares
Latest Disclosed Value $ 259,438,824
Magellan Asset Management Ltd reports 40.26% increase in ownership of AMT / American Tower Corporation

On May 11, 2026 - Magellan Asset Management Ltd filed a 13F-HR form disclosing ownership of 1,503,296 shares of American Tower Corporation (MX:AMT) valued at $259,438,824 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 1,071,779 shares of American Tower Corporation. This represents a change in shares of 40.26% during the quarter.

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 1,503,296 431,517 40.26 259,439 37.87 3.3659
2026-02-10 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 1,071,779 66,628 6.63 188,172 -2.66 2.2874
2025-11-10 2025-09-30 13F AMERICAN TOWER CORP COM 03027X100 1,005,151 167,870 20.05 193,311 4.46 2.2895
2025-08-07 2025-06-30 13F AMERICAN TOWER CORP COM 03027X100 837,281 -58,166 -6.50 185,056 -5.03 2.1153
2025-05-12 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 895,447 -98,130 -9.88 194,849 6.92 2.3690
2025-02-12 2024-12-31 13F AMERICAN TOWER CORP COM 03027X100 993,577 64,157 6.90 182,232 -15.69 2.0020
2024-11-14 2024-09-30 13F AMERICAN TOWER CORP COM 03027X100 929,420 -395,409 -29.85 216,146 -16.07 2.1519
2024-08-13 2024-06-30 13F AMERICAN TOWER CORP COM 03027X100 1,324,829 58,295 4.60 257,520 2.90 2.4516
2024-05-14 2024-03-31 13F AMERICAN TOWER CORP COM 03027X100 1,266,534 -23,422 -1.82 250,254 -10.13 2.3903
2024-02-13 2023-12-31 13F AMERICAN TOWER CORP COM 03027X100 1,289,956 -147,113 -10.24 278,476 17.84 2.7745
2023-11-13 2023-09-30 13F AMERICAN TOWER CORP COM 03027X100 1,437,069 14,016 0.98 236,326 -14.37 2.5115
2023-08-11 2023-06-30 13F AMERICAN TOWER CORP COM 03027X100 1,423,053 -5,947 -0.42 275,987 -5.48 2.4560
2023-05-12 2023-03-31 13F AMERICAN TOWER CORP COM 03027X100 1,429,000 28,828 2.06 292,002 -1.56 2.4936
2023-02-13 2022-12-31 13F AMERICAN TOWER CORP COM 03027X100 1,400,172 102,954 7.94 296,640 6.51 2.5379
2022-11-10 2022-09-30 13F AMERICAN TOWER CORP COM 03027X100 1,297,218 -24,394 -1.85 278,513 -17.55 1.9466
2022-08-12 2022-06-30 13F AMERICAN TOWER CORP COM 03027X100 1,321,612 -52,412 -3.81 337,791 -2.14 1.8437
2022-05-13 2022-03-31 13F AMERICAN TOWER CORP COM 03027X100 1,374,024 -122,196 -8.17 345,182 -21.13 1.3366
2022-02-11 2021-12-31 13F AMERICAN TOWER CORP COM 03027X100 1,496,220 17,803 1.20 437,644 11.53 1.1148
2021-11-04 2021-09-30 13F AMERICAN TOWER CORP COM 03027X100 1,478,417 -12,210 -0.82 392,387 -2.56 0.7840
2021-08-12 2021-06-30 13F AMERICAN TOWER CORP COM 03027X100 1,490,627 -9,447 -0.63 402,678 12.29 0.7970
2021-05-13 2021-03-31 13F AMERICAN TOWER CORP COM 03027X100 1,500,074 385,563 34.59 358,608 43.35 0.7502
2021-02-11 2020-12-31 13F AMERICAN TOWER CORP COM 03027X100 1,114,511 417,014 59.79 250,163 48.37 0.5786
2020-11-12 2020-09-30 13F AMERICAN TOWER COM 03027X100 697,497 594,149 574.90 168,606 531.01 0.4301
2020-08-14 2020-06-30 13F AMERICAN TOWER CORP COM 03027X100 103,348 3,872 3.89 26,720 23.36 0.0800
2020-05-14 2020-03-31 13F AMERICAN TOWER CORP COM 03027X100 99,476 -50,695 -33.76 21,661 -37.24 0.0746
2020-02-13 2019-12-31 13F AMERICAN TOWER CORP COM 03027X100 150,171 -81,522 -35.19 34,512 -32.64 0.0909
2019-11-13 2019-09-30 13F AMERICAN TOWER CORP COM 03027X100 231,693 -144,949 -38.48 51,234 -33.47 0.1473
2019-08-13 2019-06-30 13F AMERICAN TOWER CORP COM 03027X100 376,642 -280,022 -42.64 77,004 -40.49 0.2216
2019-05-14 2019-03-31 13F AMERICAN TOWER CORP COM 03027X100 656,664 -566,901 -46.33 129,402 -33.14 0.4107
2019-03-11 2018-12-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 1,223,565 121,497 11.02 193,556 20.87 0.7112
2019-02-14 2018-12-31 13F AMERICAN TOWER CORP COM 03027X100 1,223,565 121,497 193,556
2018-11-14 2018-09-30 13F AMERICAN TOWER CORP COM 03027X100 1,102,068 -5,297 -0.48 160,130 0.30 0.5236
2018-08-13 2018-06-30 13F AMERICAN TOWER CORP COM 03027X100 1,107,365 1,529 0.14 159,649 -0.67 0.5601
2018-05-15 2018-03-31 13F AMERICAN TOWER CORP COM 03027X100 1,105,836 -20,080 -1.78 160,722 0.05 0.5931
2018-02-14 2017-12-31 13F AMERICAN TOWER CORP COM 03027X100 1,125,916 111,141 10.95 160,634 15.81 0.5339
2017-11-13 2017-09-30 13F AMERICAN TOWER CORP COM 03027X100 1,014,775 146,724 16.90 138,699 20.75 0.5225
2017-08-11 2017-06-30 13F AMERICAN TOWER CORP COM 03027X100 868,051 -78,742 -8.32 114,861 -0.12 0.4819
2017-05-16 2017-03-31 13F AMERICAN TOWER CORP COM 03027X100 946,793 -166,776 -14.98 115,000 -2.28 0.5076
2017-02-15 2016-12-31 13F AMERICAN TOWER CORP COM 03027X100 1,113,569 36,540 3.39 117,682 -3.59 0.5521
2016-11-14 2016-09-30 13F AMERICAN TOWER CORP COM 03027X100 1,077,029 234,502 27.83 122,060 27.52 0.6120
2016-08-19 2016-06-30 13F AMERICAN TOWER COM 03027X100 842,527 274,050 48.21 95,719 64.48 0.5372
2016-05-13 2016-03-31 13F AMERICAN TOWER COM 03027X100 568,477 383,178 206.79 58,195 223.94 0.3137
2016-02-11 2015-12-31 13F AMERICAN TOWER COM 03027X100 185,299 -10,219 -5.23 17,965 4.44 0.1006
2015-11-10 2015-09-30 13F AMERICAN TOWER COM 03027X100 195,518 -4,528 -2.26 17,202 -7.82 0.1080
2015-08-13 2015-06-30 13F AMERICAN TOWER COM 03027X100 200,046 34,073 20.53 18,662 19.43 0.1172
2015-05-12 2015-03-31 13F AMERICAN TOWER COM 03027X100 165,973 -13,083 -7.31 15,626 -11.72 0.1006
2015-02-12 2014-12-31 13F AMERICAN TOWER COM 03027X100 179,056 -44,672 -19.97 17,700 -15.51 0.1261
2014-11-13 2014-09-30 13F AMERICAN TOWER COM 03027X100 223,728 114,717 105.23 20,948 113.56 0.1649
2014-08-12 2014-06-30 13F AMERICAN TOWER COM 03027X100 109,011 109,011 9,809 0.0739
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.