American Tower Corporation
MX ˙ BMV ˙ US03027X1000
SecurityMX:AMT / American Tower Corporation
InstitutionOppenheimer & Co Inc
Latest Disclosed Ownership36,874 shares
Latest Disclosed Value $ 6,363,715
Oppenheimer & Co Inc reports 5.94% decrease in ownership of AMT / American Tower Corporation

On April 23, 2026 - Oppenheimer & Co Inc filed a 13F-HR form disclosing ownership of 36,874 shares of American Tower Corporation (MX:AMT) valued at $6,363,715 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 39,203 shares of American Tower Corporation. This represents a change in shares of -5.94% 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)
2026-04-23 2026-03-31 13F AMERICAN TOWER COM 03027X100 36,874 -2,329 -5.94 6,364 -7.54 0.0775
2026-02-02 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 39,203 -627 -1.57 6,883 -10.16 0.0977
2025-11-06 2025-09-30 13F AMERICAN TOWER CORP COM 03027X100 39,830 -2,579 -6.08 7,660 -18.28 0.0934
2025-07-31 2025-06-30 13F AMERICAN TOWER CORP COM 03027X100 42,409 -8,666 -16.97 9,373 -15.66 0.1240
2025-04-23 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 51,075 4,051 8.61 11,114 28.86 0.1678
2025-02-05 2024-12-31 13F AMERICAN TOWER CORP COM 03027X100 47,024 -730 -1.53 8,625 -22.34 0.1287
2024-11-05 2024-09-30 13F AMERICAN TOWER CORP COM 03027X100 47,754 -25,610 -34.91 11,106 -22.12 0.1694
2024-08-08 2024-06-30 13F AMERICAN TOWER CORP COM 03027X100 73,364 17,788 32.01 14,260 29.86 0.2264
2024-05-07 2024-03-31 13F AMERICAN TOWER CORP COM 03027X100 55,576 8,354 17.69 10,981 7.72 0.1821
2024-02-13 2023-12-31 13F AMERICAN TOWER CORP COM 03027X100 47,222 -538 -1.13 10,194 29.79 0.1873
2023-11-08 2023-09-30 13F AMERICAN TOWER CORP COM 03027X100 47,760 -304 -0.63 7,854 -15.74 0.1621
2023-08-03 2023-06-30 13F AMERICAN TOWER CORP COM 03027X100 48,064 -1,645 -3.31 9,322 -8.23 0.1865
2023-05-10 2023-03-31 13F AMERICAN TOWER CORP COM 03027X100 49,709 5,783 13.17 10,158 9.14 0.2154
2023-02-08 2022-12-31 13F AMERICAN TOWER CORP COM 03027X100 43,926 -5,123 -10.44 9,306 -11.63 0.2118
2022-11-14 2022-09-30 13F AMERICAN TOWER CORP COM 03027X100 49,049 -1,164 -2.32 10,531 -17.94 0.2463
2022-08-08 2022-06-30 13F AMERICAN TOWER CORP COM 03027X100 50,213 -8,633 -14.67 12,834 -13.18 0.2763
2022-05-12 2022-03-31 13F AMERICAN TOWER CORP COM 03027X100 58,846 456 0.78 14,783 -13.45 0.2665
2022-02-02 2021-12-31 13F AMERICAN TOWER CORP COM 03027X100 58,390 1,477 2.60 17,080 13.08 0.2986
2021-11-12 2021-09-30 13F AMERICAN TOWER CORP COM 03027X100 56,913 -14,002 -19.74 15,105 -21.15 0.2827
2021-08-03 2021-06-30 13F AMERICAN TOWER CORP COM 03027X100 70,915 688 0.98 19,157 14.10 0.3433
2021-05-10 2021-03-31 13F AMERICAN TOWER CORP COM 03027X100 70,227 9,913 16.44 16,789 24.00 0.3350
2021-02-11 2020-12-31 13F AMERICAN TOWER CORP COM 03027X100 60,314 3,748 6.63 13,539 -0.98 0.2857
2020-11-13 2020-09-30 13F AMERICAN TOWER CORP COM 03027X100 56,566 2,522 4.67 13,673 -2.15 0.3421
2020-08-11 2020-06-30 13F AMERICAN TOWER CORP COM 03027X100 54,044 -5,752 -9.62 13,973 7.31 0.3615
2020-05-08 2020-03-31 13F AMERICAN TOWER CORP COM 03027X100 59,796 1,342 2.30 13,021 -3.07 0.3953
2020-02-07 2019-12-31 13F AMERICAN TOWER CORP COM 03027X100 58,454 5,512 10.41 13,434 14.75 0.3327
2019-10-31 2019-09-30 13F AMERICAN TOWER CORP COM 03027X100 52,942 1,975 3.88 11,707 12.35 0.3189
2019-08-09 2019-06-30 13F AMERICAN TOWER CORP COM 03027X100 50,967 -2,951 -5.47 10,420 -1.93 0.2832
2019-04-24 2019-03-31 13F AMERICAN TOWER CORP COM 03027X100 53,918 -1,276 -2.31 10,625 21.69 0.2838
2019-01-29 2018-12-31 13F AMERICAN TOWER CORP COM 03027X100 55,194 -2,928 -5.04 8,731 3.37 0.2730
2018-10-26 2018-09-30 13F AMERICAN TOWER CORP COM 03027X100 58,122 4,231 7.85 8,446 8.71 0.2150
2018-08-10 2018-06-30 13F AMERICAN TOWER CORP COM 03027X100 53,891 -4,958 -8.42 7,769 -9.18 0.2109
2018-05-01 2018-03-31 13F AMERICAN TOWER CORP COM 03027X100 58,849 -1,346 -2.24 8,554 -0.40 0.2197
2018-02-07 2017-12-31 13F AMERICAN TOWER CORP COM 03027X100 60,195 -11,296 -15.80 8,588 -12.11 0.2211
2017-11-09 2017-09-30 13F AMERICAN TOWER CORP COM 03027X100 71,491 -9,979 -12.25 9,771 -9.36 0.2615
2017-08-09 2017-06-30 13F AMERICAN TOWER CORP COM 03027X100 81,470 20,222 33.02 10,780 44.81 0.2972
2017-05-15 2017-03-31 13F AMERICAN TOWER CORP COM 03027X100 61,248 13,027 27.02 7,444 46.08 0.2107
2017-02-01 2016-12-31 13F AMERICAN TOWER CORP COM 03027X100 48,221 1,026 2.17 5,096 -4.71 0.1483
2016-11-07 2016-09-30 13F AMERICAN TOWER CORP COM 03027X100 47,195 -103 -0.22 5,348 -0.48 0.1559
2016-08-08 2016-06-30 13F AMERICAN TOWER CORP COM 03027X100 47,298 -1,289 -2.65 5,374 8.06 0.1602
2016-04-26 2016-03-31 13F AMERICAN TOWER CORP COM 03027X100 48,587 -10,078 -17.18 4,973 -12.55 0.1510
2016-02-03 2015-12-31 13F AMERICAN TOWER CORP COM 03027X100 58,665 -4,779 -7.53 5,687 1.88 0.1692
2015-11-13 2015-09-30 13F AMERICAN TOWER CORP COM 03027X100 63,444 2,895 4.78 5,582 -1.19 0.1696
2015-08-12 2015-06-30 13F AMERICAN TOWER CORP COM 03027X100 60,549 -2,625 -4.16 5,649 -5.03 0.1571
2015-05-08 2015-03-31 13F AMERICAN TOWER CORP COM 03027X100 63,174 2,015 3.29 5,948 -1.62 0.1619
2015-02-10 2014-12-31 13F AMERICAN TOWER CORP COM 03027X100 61,159 7,250 13.45 6,046 19.79 0.1736
2014-11-12 2014-09-30 13F AMERICAN TOWER CORP COM 03027X100 53,909 -20,842 -27.88 5,047 -24.96 0.1501
2014-08-14 2014-06-30 13F AMERICAN TOWER CORP COM 03027X100 74,751 916 1.24 6,726 11.27 0.2024
2014-05-09 2014-03-31 13F AMERICAN TOWER CORP COM 03027X100 73,835 -1,730 -2.29 6,045 0.22 0.1812
2014-02-12 2013-12-31 13F AMERICAN TOWER CORP COM 03027X100 75,565 8,927 13.40 6,032 22.11 0.1929
2013-11-01 2013-09-30 13F AMERICAN TOWER CORP COM 03027X100 66,638 8,348 14.32 4,940 15.83 0.1736
2013-08-14 2013-06-30 13F AMERICAN TOWER CORP COM 03027X100 58,290 58,290 4,265 0.1649
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.