American Tower Corporation
US ˙ NYSE ˙ US03027X1000

SecurityAMT / American Tower Corporation
InstitutionWestpac Banking Corp
Latest Disclosed Ownership19,786 shares
Latest Disclosed Value $ 3,414,668
Westpac Banking Corp reports 7.64% increase in ownership of AMT / American Tower Corporation

On May 11, 2026 - Westpac Banking Corp filed a 13F-HR form disclosing ownership of 19,786 shares of American Tower Corporation (US:AMT) valued at $3,414,668 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 18,381 shares of American Tower Corporation. This represents a change in shares of 7.64% during the quarter. The current value of the position is $3,836,703 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 19,786 1,405 7.64 3,415 5.79 0.1189
2026-02-10 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 18,381 -128 -0.69 3,227 -9.33 0.2038
2025-11-14 2025-09-30 13F/A-1 AMERICAN TOWER CORP REIT USD 0.01 COM 03027X100 18,509 -3,724 -16.75 3,560 -27.56 0.2206
2025-11-12 2025-09-30 13F AMERICAN TOWER CORP REIT USD 0.01 COM 03027X100 18,509 -3,724 3,560 0.0893
2025-08-11 2025-06-30 13F AMERICAN TOWER CORP COM 03027X100 22,233 -167 -0.75 4,914 0.80 0.3285
2025-05-13 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 22,400 -1,875 -7.72 4,874 9.48 0.3586
2025-02-12 2024-12-31 13F AMERICAN TOWER CORP COM 03027X100 24,275 -4,731 -16.31 4,452 -34.00 0.2954
2024-11-08 2024-09-30 13F AMERICAN TOWER CORP COM 03027X100 29,006 -4,165 -12.56 6,746 4.62 0.4522
2024-08-14 2024-06-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 33,171 -1,382 -4.00 6,448 -5.57 0.5113
2024-08-13 2024-06-30 13F AMERICAN TOWER CORP COM 03027X100 11,365 -23,188 6,448 0.2217
2024-05-09 2024-03-31 13F AMERICAN TOWER CORP COM 03027X100 34,553 -4,122 -10.66 6,827 -18.23 0.5202
2024-02-08 2023-12-31 13F AMERICAN TOWER CORP COM 03027X100 38,675 -1,976 -4.86 8,349 24.89 0.6883
2023-11-13 2023-09-30 13F AMERICAN TOWER CORP COM 03027X100 40,651 -1,158 -2.77 6,685 -17.55 0.5002
2023-08-10 2023-06-30 13F AMERICAN TOWER CORP COM 03027X100 41,809 -191,198 -82.06 8,108 -82.97 0.5722
2023-05-04 2023-03-31 13F AMERICAN TOWER CORP COM 03027X100 233,007 96,662 70.90 47,613 64.83 0.6401
2023-02-06 2022-12-31 13F AMERICAN TOWER CORP COM 03027X100 136,345 12,987 10.53 28,886 9.07 0.4270
2022-11-08 2022-09-30 13F AMERICAN TOWER CORP COM 03027X100 123,358 -37,466 -23.30 26,485 -35.57 0.4037
2022-08-10 2022-06-30 13F AMERICAN TOWER CORP COM 03027X100 160,824 47,597 42.04 41,105 44.51 0.5355
2022-05-11 2022-03-31 13F AMERICAN TOWER CORP COM 03027X100 113,227 -40,626 -26.41 28,445 -36.79 0.3263
2022-02-08 2021-12-31 13F AMERICAN TOWER CORP COM 03027X100 153,853 -63,148 -29.10 45,002 -21.86 0.4662
2021-10-27 2021-09-30 13F AMERICAN TOWER CORP COM 03027X100 217,001 -36,935 -14.55 57,594 -16.04 0.6157
2021-08-11 2021-06-30 13F AMERICAN TOWER CORP COM 03027X100 253,936 -1,517 -0.59 68,598 12.33 0.6888
2021-05-13 2021-03-31 13F AMERICAN TOWER CORP COM 03027X100 255,453 80,976 46.41 61,069 55.93 0.6738
2021-02-11 2020-12-31 13F AMERICAN TOWER CORP COM 03027X100 174,477 -968 -0.55 39,163 -7.66 0.4445
2020-11-10 2020-09-30 13F AMERICAN TOWER CORP COM 03027X100 175,445 -28,266 -13.88 42,410 -19.48 0.5747
2020-08-12 2020-06-30 13F AMERICAN TOWER CORP COM 03027X100 203,711 -22,468 -9.93 52,667 6.94 0.7851
2020-05-14 2020-03-31 13F AMERICAN TOWER CORP COM 03027X100 226,179 34,605 18.06 49,250 11.86 0.8487
2020-02-11 2019-12-31 13F AMERICAN TOWER CORP COM 03027X100 191,574 -7,948 -3.98 44,028 -0.21 0.5667
2019-11-13 2019-09-30 13F AMERICAN TOWER CORP COM 03027X100 199,522 -27,320 -12.04 44,120 -4.87 0.6135
2019-08-01 2019-06-30 13F AMERICAN TOWER CORP COM 03027X100 226,842 -15,394 -6.35 46,378 -2.84 0.7082
2019-05-14 2019-03-31 13F AMERICAN TOWER CORP COM 03027X100 242,236 5,844 2.47 47,735 27.65 0.7880
2019-02-07 2018-12-31 13F AMERICAN TOWER CORP COM 03027X100 236,392 15,561 7.05 37,395 16.54 0.6373
2018-11-13 2018-09-30 13F AMERICAN TOWER CORP COM 03027X100 220,831 116,546 111.76 32,087 113.42 0.5501
2018-07-18 2018-06-30 13F AMERICAN TOWER CORP COM 03027X100 104,285 -9,456 -8.31 15,035 -9.06 0.2889
2018-05-01 2018-03-31 13F AMERICAN TOWER CORP COM 03027X100 113,741 -11,069 -8.87 16,531 -7.16 0.3301
2018-01-18 2017-12-31 13F AMERICAN TOWER CORP COM 03027X100 124,810 6,682 5.66 17,807 10.29 0.4046
2017-10-30 2017-09-30 13F AMERICAN TOWER CORP COM 03027X100 118,128 2,494 2.16 16,146 5.52 0.3555
2017-08-09 2017-06-30 13F AMERICAN TOWER CORP COM 03027X100 115,634 -60,155 -34.22 15,301 -28.39 0.3369
2017-05-18 2017-03-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 175,789 30,942 21.36 21,365 26.90 0.1712
2017-05-11 2017-03-31 13F AMERICAN TOWER CORP COM 03027X100 113,639 12,447
2017-02-09 2016-12-31 13F AMERICAN TOWER CORP COM 03027X100 144,847 9,864 7.31 16,836 19.30 0.1588
2016-11-10 2016-09-30 13F AMERICAN TOWER CORP COM 03027X100 134,983 18,551 15.93 14,113 25.27 0.1524
2016-08-10 2016-06-30 13F AMERICAN TOWER CORP COM 03027X100 116,432 -22,372 -16.12 11,266 -20.72 0.1233
2016-05-13 2016-03-31 13F AMERICAN TOWER CORP COM 03027X100 138,804 19,900 16.74 14,209 23.27 0.1545
2016-02-11 2015-12-31 13F AMERICAN TOWER CORP COM 03027X100 118,904 -3,463 -2.83 11,528 7.08 0.1275
2015-11-16 2015-09-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 122,367 6,346 5.47 10,766 -0.54 0.1185
2015-11-12 2015-09-30 13F AMERICAN TOWER CORP COM 03027X100 122,367 10,766
2015-08-12 2015-06-30 13F AMERICAN TOWER CORP COM 03027X100 116,021 -9,866 -7.84 10,824 -18.83 0.1059
2015-05-12 2015-03-31 13F AMERICAN TOWER CORP COM 03027X100 125,887 37,301 42.11 13,333 52.27 0.1158
2015-02-11 2014-12-31 13F AMERICAN TOWER CORP COM 03027X100 88,586 3,551 4.18 8,757 9.99 0.0833
2014-11-12 2014-09-30 13F AMERICAN TOWER CORP COM 03027X100 85,035 -4,783 -5.33 7,962 -1.48 0.0776
2014-08-11 2014-06-30 13F AMERICAN TOWER CORP COM 03027X100 89,818 922 1.04 8,082 11.05 0.0779
2014-05-12 2014-03-31 13F AMERICAN TOWER CORP COM 03027X100 88,896 9,059 11.35 7,278 14.22 0.0775
2014-02-13 2013-12-31 13F AMERICAN TOWER CORP COM 03027X100 79,837 -7,011 -8.07 6,372 -1.04 0.0729
2013-11-12 2013-09-30 13F AMERICAN TOWER CORP COM 03027X100 86,848 -7,494 -7.94 6,439 -8.50 0.0805
2013-08-14 2013-06-30 13F AMERICAN TOWER CORP COM 03027X100 94,342 94,342 7,037 0.1076
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.