American Tower Corporation
MX ˙ BMV ˙ US03027X1000
SecurityMX:AMT / American Tower Corporation
InstitutionEastern Bank
Latest Disclosed Ownership153,091 shares
Latest Disclosed Value $ 26,420,417
Eastern Bank reports 3.60% increase in ownership of AMT / American Tower Corporation

On April 7, 2026 - Eastern Bank filed a 13F-HR form disclosing ownership of 153,091 shares of American Tower Corporation (MX:AMT) valued at $26,420,417 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 14, 2026 disclosing 147,774 shares of American Tower Corporation. This represents a change in shares of 3.60% 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.

Upgrade to unlock premium data and export to Excel .

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 COM 03027X100 153,091 5,317 3.60 26,420 1.83 0.4137
2026-01-14 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 147,774 8,683 6.24 25,945 -3.01 0.4477
2025-10-27 2025-09-30 13F AMERICAN TOWER CORP COM 03027X100 139,091 57,078 69.60 26,750 47.57 0.4752
2025-07-24 2025-06-30 13F AMERICAN TOWER CORP COM 03027X100 82,013 -95 -0.12 18,126 1.46 0.3451
2025-05-08 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 82,108 -18,240 -18.18 17,867 -2.92 0.3499
2025-01-13 2024-12-31 13F American Tower COM 03027X100 100,348 -2,079 -2.03 18,405 -22.74 0.3420
2024-10-21 2024-09-30 13F American Tower COM 03027X100 102,427 96,427 1,607.12 23,820 1,942.88 0.4267
2024-07-23 2024-06-30 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 6,000 0 0.00 1,166 -1.60 0.0471
2024-05-09 2024-03-31 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 6,000 -4,003 -40.02 1,186 -45.11 0.0494
2024-01-25 2023-12-31 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 10,003 -539 -5.11 2,159 24.58 0.0980
2023-10-17 2023-09-30 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 10,542 -70 -0.66 1,734 -15.79 0.0861
2023-07-19 2023-06-30 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 10,612 -1 -0.01 2,058 -5.07 0.0979
2023-04-19 2023-03-31 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 10,613 -13,008 -55.07 2,169 -56.67 0.1090
2023-01-24 2022-12-31 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 23,621 898 3.95 5,004 2.58 0.2671
2022-10-19 2022-09-30 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 22,723 1,302 6.08 4,878 -10.90 0.2785
2022-07-20 2022-06-30 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 21,421 756 3.66 5,475 5.45 0.2913
2022-04-21 2022-03-31 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 20,665 3,744 22.13 5,192 4.89 0.2407
2022-01-26 2021-12-31 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 16,921 113 0.67 4,950 10.96 0.2159
2021-10-19 2021-09-30 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 16,808 115 0.69 4,461 -1.09 0.2155
2021-07-20 2021-06-30 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 16,693 439 2.70 4,510 16.06 0.2211
2021-04-27 2021-03-31 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 16,254 -133 -0.81 3,886 5.66 0.2099
2021-01-20 2020-12-31 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 16,387 14 0.09 3,678 -7.07 0.2059
2020-10-30 2020-09-30 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 16,373 -5 -0.03 3,958 -6.52 0.2423
2020-09-01 2020-06-30 13F/A-1 AMERICAN TOWER REIT COMMON STOCKS 03027X100 16,378 -779 -4.54 4,234 13.33 0.2754
2020-07-21 2020-06-30 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 16,378 -779 4,234 103,971.1376
2020-04-27 2020-03-31 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 17,157 8,620 100.97 3,736 90.42 0.2781
2020-02-04 2019-12-31 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 8,537 -1 -0.01 1,962 3.92 0.1140
2019-11-04 2019-09-30 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 8,538 0 0.00 1,888 8.13 0.1178
2019-07-24 2019-06-30 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 8,538 0 0.00 1,746 3.80 0.1111
2019-04-18 2019-03-31 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 8,538 38 0.45 1,682 25.15 0.1127
2019-01-18 2018-12-31 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 8,500 2,000 30.77 1,344 42.37 0.1004
2018-10-16 2018-09-30 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 6,500 0 0.00 944 0.75 0.0616
2018-07-18 2018-06-30 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 6,500 0 0.00 937 -0.85 0.0640
2018-04-09 2018-03-31 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 6,500 -9 -0.14 945 1.72 0.0661
2018-01-22 2017-12-31 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 6,509 0 0.00 929 4.38 0.0623
2017-10-24 2017-09-30 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 6,509 0 0.00 890 3.37 0.0630
2017-07-26 2017-06-30 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 6,509 0 0.00 861 8.85 0.0634
2017-04-17 2017-03-31 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 6,509 -5 -0.08 791 14.97 0.0597
2017-01-18 2016-12-31 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 6,514 0 0.00 688 -6.78 0.0535
2016-10-17 2016-09-30 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 6,514 0 0.00 738 -0.27 0.0593
2016-07-15 2016-06-30 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 6,514 0 0.00 740 10.94 0.0598
2016-04-14 2016-03-31 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 6,514 14 0.22 667 5.87 0.0544
2016-01-20 2015-12-31 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 6,500 0 0.00 630 10.14 0.0524
2015-10-16 2015-09-30 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 6,500 2,750 73.33 572 108.76 0.0499
2013-08-09 2013-06-30 13F AMERICAN TOWER REIT COMMON STOCKS 03027X100 3,750 3,750 274 0.0255
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.