아메리칸 타워 코퍼레이션
MX ˙ BMV ˙ US03027X1000
SecurityMX:AMT / American Tower Corporation
InstitutionQuadrant Capital Group Llc
Latest Disclosed Ownership19,551 shares
Latest Disclosed Value $ 3,374,112
Quadrant Capital Group Llc reports 28.74% increase in ownership of AMT / American Tower Corporation

On May 13, 2026 - Quadrant Capital Group Llc filed a 13F-HR/A form disclosing ownership of 19,551 shares of American Tower Corporation (MX:AMT) valued at $3,374,112 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 15,187 shares of American Tower Corporation. This represents a change in shares of 28.74% 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)
2026-05-13 2026-03-31 13F/A-1 AMERICAN TOWER COM 03027X100 19,551 4,364 28.74 3,374 26.56 0.1009
2026-05-11 2026-03-31 13F AMERICAN TOWER COM 03027X100 19,551 4,364 49 0.0369
2026-02-12 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 15,187 6,958 84.55 2,667 68.52 0.0806
2025-11-13 2025-09-30 13F AMERICAN TOWER CORP COM 03027X100 8,229 -1,982 -19.41 1,583 -29.91 0.0515
2025-08-13 2025-06-30 13F AMERICAN TOWER CORP COM 03027X100 10,211 707 7.44 2,257 9.14 0.0812
2025-05-13 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 9,504 3,768 65.69 2,068 96.58 0.0768
2025-02-13 2024-12-31 13F AMERICAN TOWER CORP COM 03027X100 5,736 -277 -4.61 1,052 -24.75 0.0724
2024-11-12 2024-09-30 13F AMERICAN TOWER CORP COM 03027X100 6,013 85 1.43 1,398 21.35 0.0971
2024-08-12 2024-06-30 13F AMERICAN TOWER CORP COM 03027X100 5,928 157 2.72 1,152 1.05 0.0856
2024-05-15 2024-03-31 13F AMERICAN TOWER CORP COM 03027X100 5,771 299 5.46 1,140 -3.47 0.0900
2024-02-08 2023-12-31 13F AMERICAN TOWER CORP COM 03027X100 5,472 779 16.60 1,181 53.18 0.1015
2023-11-14 2023-09-30 13F AMERICAN TOWER CORP COM 03027X100 4,693 794 20.36 772 1.98 0.0773
2023-08-10 2023-06-30 13F AMERICAN TOWER CORP COM 03027X100 3,899 -113 -2.82 756 -7.69 0.0750
2023-05-11 2023-03-31 13F AMERICAN TOWER CORP COM 03027X100 4,012 -952 -19.18 820 -22.07 0.0854
2023-02-13 2022-12-31 13F AMERICAN TOWER CORP COM 03027X100 4,964 331 7.14 1,052 5.63 0.1192
2022-11-10 2022-09-30 13F AMERICAN TOWER CORP COM 03027X100 4,633 -470 -9.21 995 -23.70 0.1316
2022-08-09 2022-06-30 13F AMERICAN TOWER CORP COM 03027X100 5,103 615 13.70 1,304 15.71 0.1752
2022-05-06 2022-03-31 13F AMERICAN TOWER CORP COM 03027X100 4,488 81 1.84 1,127 -12.57 0.1365
2022-02-01 2021-12-31 13F AMERICAN TOWER CORP COM 03027X100 4,407 -106 -2.35 1,289 7.60 0.1538
2021-11-12 2021-09-30 13F AMERICAN TOWER CORP COM 03027X100 4,513 23 0.51 1,198 -1.24 0.1671
2021-08-09 2021-06-30 13F AMERICAN TOWER CORP COM 03027X100 4,490 816 22.21 1,213 38.15 0.1759
2021-05-12 2021-03-31 13F AMERICAN TOWER CORP COM 03027X100 3,674 103 2.88 878 9.48 0.1425
2021-02-16 2020-12-31 13F AMERICAN TOWER CORP COM 03027X100 3,571 -118 -3.20 802 -10.09 0.1489
2020-11-13 2020-09-30 13F AMERICAN TOWER CORP COM 03027X100 3,689 -20 -0.54 892 -6.99 0.1944
2020-08-13 2020-06-30 13F AMERICAN TOWER CORP COM 03027X100 3,709 -2,121 -36.38 959 -24.25 0.2122
2020-05-15 2020-03-31 13F American Tower Com 03027X100 5,830 1,679 40.45 1,266 36.86 0.2119
2020-03-19 2019-12-31 13F/A-1 American Tower Com 03027X100 4,151 225 5.73 925 8.44 0.1115
2020-02-03 2019-12-31 13F American Tower Com 03027X100 4,151 225 925 3,125.6957
2019-10-24 2019-09-30 13F American Tower COM 03027X100 3,926 309 8.54 853 17.66 0.1312
2019-07-24 2019-06-30 13F American Tower COM 03027X100 3,617 292 8.78 725 13.46 0.1147
2019-04-29 2019-03-31 13F American Tower COM 03027X100 3,325 559 20.21 639 50.71 0.1123
2019-01-17 2018-12-31 13F AMERICAN TOWER COM 03027X100 2,766 53 1.95 424 11.87 0.1130
2018-10-29 2018-09-30 13F AMERICAN TOWER COM 03027X100 2,713 63 2.38 379 3.84 0.1083
2018-08-08 2018-06-30 13F AMERICAN TOWER COM 03027X100 2,650 -105 -3.81 365 -5.44 0.1280
2018-05-10 2018-03-31 13F AMERICAN TOWER COM 03027X100 2,755 295 11.99 386 14.20 0.1400
2018-01-31 2017-12-31 13F AMERICAN TOWER COM 03027X100 2,460 75 3.14 338 7.99 0.1348
2017-10-13 2017-09-30 13F American Tower COM 03027X100 2,385 91 3.97 313 12.59 0.1291
2017-08-14 2017-06-30 13F American Tower COM 03027X100 2,294 -261 -10.22 278 -7.95 0.1229
2017-04-10 2017-03-31 13F American Tower COM 03027X100 2,555 70 2.82 302 18.90 0.1327
2017-01-11 2016-12-31 13F American Tower COM 03027X100 2,485 32 1.30 254 -5.93 0.1274
2016-10-25 2016-09-30 13F American Tower COM 03027X100 2,453 0 0.00 270 -0.37 0.1761
2016-07-28 2016-06-30 13F American Tower COM 03027X100 2,453 44 1.83 271 11.98 0.1864
2016-04-27 2016-03-31 13F American Tower COM 03027X100 2,409 104 4.51 242 11.01 0.1568
2016-01-28 2015-12-31 13F American Tower COM 03027X100 2,305 58 2.58 218 12.95 0.1509
2015-10-28 2015-09-30 13F American Tower COM 03027X100 2,247 16 0.72 193 -6.31 0.1332
2015-08-12 2015-06-30 13F American Tower COM 03027X100 2,231 2,231 206 0.1311
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.