아메리칸 타워 코퍼레이션
MX ˙ BMV ˙ US03027X1000
SecurityMX:AMT / American Tower Corporation
InstitutionVestmark Advisory Solutions, Inc.
Latest Disclosed Ownership14,428 shares
Latest Disclosed Value $ 2,490,128
Vestmark Advisory Solutions, Inc. reports 7.28% increase in ownership of AMT / American Tower Corporation

On May 15, 2026 - Vestmark Advisory Solutions, Inc. filed a 13F-HR form disclosing ownership of 14,428 shares of American Tower Corporation (MX:AMT) valued at $2,490,128 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 13,449 shares of American Tower Corporation. This represents a change in shares of 7.28% 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)
2026-05-15 2026-03-31 13F AMERICAN TOWER COM 03027X100 14,428 979 7.28 2,490 5.46 0.0171
2026-02-06 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 13,449 1,717 14.64 2,361 4.65 0.0319
2025-11-10 2025-09-30 13F AMERICAN TOWER CORP COM 03027X100 11,732 -1,665 -12.43 2,256 -23.78 0.0430
2025-08-06 2025-06-30 13F AMERICAN TOWER CORP COM 03027X100 13,397 1,853 16.05 2,961 17.88 0.0428
2025-05-13 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 11,544 5,183 81.48 2,512 115.35 0.0647
2025-02-06 2024-12-31 13F AMERICAN TOWER CORP COM 03027X100 6,361 -2,053 -24.40 1,167 -40.39 0.0402
2024-11-14 2024-09-30 13F AMERICAN TOWER CORP COM 03027X100 8,414 -130 -1.52 1,957 17.83 0.0728
2024-08-12 2024-06-30 13F AMERICAN TOWER CORP COM 03027X100 8,544 -3,018 -26.10 1,661 -27.32 0.0693
2024-05-15 2024-03-31 13F AMERICAN TOWER CORP COM 03027X100 11,562 846 7.89 2,284 -1.25 0.0984
2024-02-06 2023-12-31 13F AMERICAN TOWER CORP COM 03027X100 10,716 1,707 18.95 2,313 56.18 0.1175
2023-11-06 2023-09-30 13F AMERICAN TOWER CORP COM 03027X100 9,009 -8,305 -47.97 1,482 -55.88 0.1077
2023-08-07 2023-06-30 13F AMERICAN TOWER CORP COM 03027X100 17,314 -90 -0.52 3,358 -5.60 0.1279
2023-05-09 2023-03-31 13F AMERICAN TOWER CORP COM 03027X100 17,404 -1,980 -10.21 3,556 -13.40 0.1540
2023-01-20 2022-12-31 13F AMERICAN TOWER CORP COM 03027X100 19,384 -1,738 -8.23 4,107 -9.46 0.2001
2022-11-03 2022-09-30 13F AMERICAN TOWER CORP COM 03027X100 21,122 5,146 32.21 4,535 11.07 0.2528
2022-08-04 2022-06-30 13F AMERICAN TOWER CORP COM 03027X100 15,976 5,492 52.38 4,083 55.07 0.2332
2022-04-27 2022-03-31 13F AMERICAN TOWER CORP COM 03027X100 10,484 2,123 25.39 2,633 7.65 0.1490
2022-01-31 2021-12-31 13F AMERICAN TOWER CORP COM 03027X100 8,361 -330 -3.80 2,446 6.03 0.1380
2021-11-15 2021-09-30 13F AMERICAN TOWER CORP COM 03027X100 8,691 -353 -3.90 2,307 -5.57 0.1562
2021-08-09 2021-06-30 13F AMERICAN TOWER CORP COM 03027X100 9,044 -101 -1.10 2,443 11.76 0.1738
2021-05-10 2021-03-31 13F AMERICAN TOWER CORP COM 03027X100 9,145 1,623 21.58 2,186 29.50 0.1939
2021-02-04 2020-12-31 13F AMERICAN TOWER CORP COM 03027X100 7,522 533 7.63 1,688 -0.06 0.1894
2020-10-19 2020-09-30 13F AMERICAN TOWER CORP COM 03027X100 6,989 16 0.23 1,689 -6.32 0.2269
2020-08-13 2020-06-30 13F AMERICAN TOWER CORP COM 03027X100 6,973 202 2.98 1,803 22.32 0.2790
2020-05-06 2020-03-31 13F AMERICAN TOWER CORP COM 03027X100 6,771 6,771 -2.90 1,474 -18.25 0.2881
2020-02-14 2019-12-31 13F AMERICAN TOWER CORP COM 03027X100 0 -6,770 -100.00 0 -100.00
2019-11-05 2019-09-30 13F AMERICAN TOWER CORP COM 03027X100 6,770 -364 -5.10 1,497 2.67 0.2427
2019-08-20 2019-06-30 13F AMERICAN TOWER CORP COM 03027X100 7,134 -446 -5.88 1,458 -2.41 0.2495
2019-05-14 2019-03-31 13F AMERICAN TOWER CORP COM 03027X100 7,580 7,580 1,494 0.2664
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.