美國鐵塔公司
MX ˙ BMV ˙ US03027X1000
SecurityMX:AMT / American Tower Corporation
InstitutionCi Investments Inc.
Latest Disclosed Ownership88,755 shares
Latest Disclosed Value $ 15,317,338
Ci Investments Inc. reports 6.31% increase in ownership of AMT / American Tower Corporation

On May 13, 2026 - Ci Investments Inc. filed a 13F-HR form disclosing ownership of 88,755 shares of American Tower Corporation (MX:AMT) valued at $15,317,338 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 83,484 shares of American Tower Corporation. This represents a change in shares of 6.31% 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 AMERICAN TOWER CORP COM 03027X100 88,755 5,271 6.31 15,317 4.50 0.0522
2026-02-12 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 83,484 -2,762 -3.20 14,657 91,506.25 0.0642
2025-11-12 2025-09-30 13F AMERICAN TOWER CORP COM 03027X100 86,246 2,016 2.39 17 -11.11 0.0603
2025-08-12 2025-06-30 13F AMERICAN TOWER CORP COM 03027X100 84,230 1,501 1.81 19 0.00 0.0698
2025-05-13 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 82,729 -85,566 -50.84 18 -40.00 0.0758
2025-02-12 2024-12-31 13F AMERICAN TOWER CORP COM 03027X100 168,295 -12,128 -6.72 31 -26.83 0.1163
2024-11-12 2024-09-30 13F AMERICAN TOWER CORP COM 03027X100 180,423 -29,715 -14.14 42 2.50 0.1597
2024-08-12 2024-06-30 13F AMERICAN TOWER CORP COM 03027X100 210,138 -8,577 -3.92 41 -6.98 0.1609
2024-05-13 2024-03-31 13F AMERICAN TOWER CORP COM 03027X100 218,715 -401 -0.18 43 -8.51 0.1715
2024-02-12 2023-12-31 13F AMERICAN TOWER CORP COM 03027X100 219,116 -3,162 -1.42 47 30.56 0.2446
2023-11-13 2023-09-30 13F AMERICAN TOWER CORP COM 03027X100 222,278 -1,080 -0.48 37 -16.28 0.2039
2023-08-11 2023-06-30 13F AMERICAN TOWER CORP COM 03027X100 223,358 493 0.22 43 -4.44 0.2185
2023-05-12 2023-03-31 13F AMERICAN TOWER CORP COM 03027X100 222,865 36,513 19.59 46 15.38 0.2291
2023-02-10 2022-12-31 13F AMERICAN TOWER CORP COM 03027X100 186,352 -10,783 -5.47 39 -99.91 0.1997
2022-11-14 2022-09-30 13F AMERICAN TOWER CORP COM 03027X100 197,135 -11,599 -5.56 42,325 -20.67 0.2196
2022-08-12 2022-06-30 13F AMERICAN TOWER CORP COM 03027X100 208,734 10,161 5.12 53,350 6.94 0.2488
2022-05-12 2022-03-31 13F AMERICAN TOWER CORP COM 03027X100 198,573 -130,596 -39.67 49,886 -48.19 0.1835
2022-02-11 2021-12-31 13F AMERICAN TOWER CORP COM 03027X100 329,169 -15,321 -4.45 96,282 5.31 0.3323
2021-11-12 2021-09-30 13F AMERICAN TOWER CORP COM 03027X100 344,490 -15,962 -4.43 91,431 -6.10 0.3404
2021-08-13 2021-06-30 13F AMERICAN TOWER CORP COM 03027X100 360,452 -12,099 -3.25 97,373 9.33 0.3569
2021-05-13 2021-03-31 13F AMERICAN TOWER CORP COM 03027X100 372,551 251,660 208.17 89,062 228.22 0.3756
2021-02-09 2020-12-31 13F AMERICAN TOWER CORP COM 03027X100 120,891 12,011 11.03 27,135 3.10 0.1196
2020-11-09 2020-09-30 13F AMERICAN TOWER CORP COM 03027X100 108,880 13,588 14.26 26,320 6.83 0.1308
2020-08-07 2020-06-30 13F AMERICAN TOWER CORP COM 03027X100 95,292 -6,926 -6.78 24,637 10.69 0.1313
2020-08-07 2020-03-31 13F AMERICAN TOWER CORP COM 03027X100 102,218 -39,700 -27.97 22,258 -31.76 0.1350
2020-02-11 2019-12-31 13F AMERICAN TOWER CORP COM 03027X100 141,918 34,108 31.64 32,616 36.81 0.1656
2019-11-08 2019-09-30 13F AMERICAN TOWER CORP COM 03027X100 107,810 3,252 3.11 23,840 11.52 0.1231
2019-08-12 2019-06-30 13F AMERICAN TOWER CORP COM 03027X100 104,558 -21,158 -16.83 21,377 -13.71 0.1190
2019-05-15 2019-03-31 13F AMERICAN TOWER CORP COM 03027X100 125,716 -32,798 -20.69 24,774 -1.20 0.1389
2019-02-15 2018-12-31 13F AMERICAN TOWER CORP COM 03027X100 158,514 -14,440 -8.35 25,075 -0.22 0.1618
2018-11-09 2018-09-30 13F AMERICAN TOWER CORP COM 03027X100 172,954 14,754 9.33 25,130 10.18 0.1882
2018-08-14 2018-06-30 13F AMERICAN TOWER CORP COM 03027X100 158,200 158,200 22,808 0.1792
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.