아메리칸 타워 코퍼레이션
MX ˙ BMV ˙ US03027X1000
SecurityMX:AMT / American Tower Corporation
InstitutionSecond Line Capital, LLC
Latest Disclosed Ownership16,050 shares
Latest Disclosed Value $ 2,932,532
Second Line Capital, LLC reports 1.97% decrease in ownership of AMT / American Tower Corporation

On May 15, 2026 - Second Line Capital, LLC filed a 13F-HR form disclosing ownership of 16,050 shares of American Tower Corporation (MX:AMT) valued at $2,932,532 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 16,373 shares of American Tower Corporation. This represents a change in shares of -1.97% 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)
2026-05-15 2026-03-31 13F AMERICAN TOWER CORP COM REIT 03027X100 16,050 -323 -1.97 2,933 1.03 0.5554
2026-02-17 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 16,373 567 3.59 2,902 -5.35 0.5965
2025-11-19 2025-09-30 13F AMERICAN TOWER CORP COM 03027X100 15,806 -824 -4.95 3,067 -17.20 0.6348
2025-08-18 2025-06-30 13F AMERICAN TOWER CORP COM 03027X100 16,630 500 3.10 3,704 5.53 0.8605
2025-05-15 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 16,130 1,588 10.92 3,510 30.45 0.9045
2025-02-14 2024-12-31 13F AMERICAN TOWER CORP COM 03027X100 14,542 2,686 22.66 2,691 -2.43 0.7254
2024-11-19 2024-09-30 13F AMERICAN TOWER CORP COM 03027X100 11,856 138 1.18 2,757 20.08 0.7514
2024-08-16 2024-06-30 13F AMERICAN TOWER CORP COM 03027X100 11,718 898 8.30 2,296 7.44 0.7025
2024-05-22 2024-03-31 13F AMERICAN TOWER CORP COM 03027X100 10,820 1,174 12.17 2,138 1.86 0.6934
2024-02-09 2023-12-31 13F AMERICAN TOWER CORP COM 03027X100 9,646 9,646 2,099 0.8397
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.