아메리칸 타워 코퍼레이션
MX ˙ BMV ˙ US03027X1000
SecurityMX:AMT / American Tower Corporation
InstitutionRB Capital Management, LLC
Latest Disclosed Ownership3,727 shares
Latest Disclosed Value $ 643,207
RB Capital Management, LLC ownership in AMT / American Tower Corporation

On May 14, 2026 - RB Capital Management, LLC filed a 13F-HR form disclosing ownership of 3,727 shares of American Tower Corporation (MX:AMT) valued at $643,207 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 4,062 shares of American Tower Corporation. This represents a change in shares of -8.25% during the quarter.

RB Capital Management, LLC has a history of taking positions in derivatives of the underlying security (AMT) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
(Premium Subscription Required)

In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:AMT / American Tower Corporation Historical Put/Call Ratio
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)
2026-05-14 2026-03-31 13F AMERICAN TOWER COM 03027X100 3,727 -335 -8.25 643 -9.82 0.1366
2026-02-03 2025-12-31 13F AMERICAN TOWER CORP COM 03027X100 4,062 -579 -12.48 713 -20.07 0.1416
2025-10-21 2025-09-30 13F AMERICAN TOWER CORP COM 03027X100 4,641 -212 -4.37 893 -16.79 0.1842
2025-07-07 2025-06-30 13F AMERICAN TOWER CORP COM 03027X100 4,853 -178 -3.54 1,073 -2.01 0.2429
2025-05-14 2025-03-31 13F AMERICAN TOWER CORP COM 03027X100 5,031 -253 -4.79 1,095 12.90 0.2539
2025-02-18 2024-12-31 13F AMERICAN TOWER CORP COM 03027X100 5,284 -530 -9.12 969 -28.33 0.2211
2024-11-18 2024-09-30 13F AMERICAN TOWER CORP COM 03027X100 5,814 -429 -6.87 1,352 11.46 0.3146
2024-08-14 2024-06-30 13F AMERICAN TOWER CORP COM 03027X100 6,243 -2,162 -25.72 1,214 -26.93 0.2992
2024-05-13 2024-03-31 13F AMERICAN TOWER CORP COM 03027X100 8,405 82 0.99 1,661 -7.57 0.4363
2024-02-06 2023-12-31 13F AMERICAN TOWER CORP COM 03027X100 8,323 -310 -3.59 1,797 26.57 0.5145
2023-11-16 2023-09-30 13F AMERICAN TOWER CORP COM 03027X100 8,633 -113 -1.29 1,420 -16.33 0.4424
2023-12-11 2023-06-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 8,746 115 1.33 1,696 -3.80 0.5103
2023-08-08 2023-06-30 13F AMERICAN TOWER CORP COM 03027X100 8,746 115 1,696 0.4357
2023-05-10 2023-03-31 13F AMERICAN TOWER CORP COM 03027X100 8,631 555 6.87 1,764 3.10 0.5581
2023-01-19 2022-12-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 8,076 340 4.40 1,711 2.95 0.6042
2023-01-11 2022-12-31 13F AMERICAN TOWER CORP COM 03027X100 8,076 340 2 0.5987
2022-10-24 2022-09-30 13F AMERICAN TOWER CORP COM 03027X100 7,736 543 7.55 1,661 -9.63 0.6366
2022-07-14 2022-06-30 13F AMERICAN TOWER CORP COM 03027X100 7,193 397 5.84 1,838 7.67 0.6850
2022-05-10 2022-03-31 13F/A-1 AMERICAN TOWER CORP COM 03027X100 6,796 499 7.92 1,707 -7.33 0.5477
2022-04-11 2022-03-31 13F AMERICAN TOWER CORP COM 03027X100 6,796 499 1,707 0.5961
2022-02-14 2021-12-31 13F AMERICAN TOWER CORP COM 03027X100 6,297 269 4.46 1,842 15.13 0.5748
2021-11-12 2021-09-30 13F AMERICAN TOWER CORP COM 03027X100 6,028 224 3.86 1,600 2.04 0.6014
2021-08-06 2021-06-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 5,804 313 5.70 1,568 19.42 0.5921
2021-08-06 2021-06-30 13F AMERICAN TOWER CORP COM 03027X100 5,804 313 1,568 0.3851
2021-05-11 2021-03-31 13F AMERICAN TOWER CORP COM 03027X100 5,491 728 15.28 1,313 22.83 0.5792
2021-02-04 2020-12-31 13F AMERICAN TOWER CORP COM 03027X100 4,763 209 4.59 1,069 -3.52 0.4937
2020-11-12 2020-09-30 13F AMERICAN TOWER CORP COM 03027X100 4,554 512 12.67 1,108 6.03 0.5207
2020-07-31 2020-06-30 13F AMERICAN TOWER CORP COM 03027X100 4,042 -230 -5.38 1,045 10.82 0.5538
2020-05-15 2020-03-31 13F AMERICAN TOWER CORP COM 03027X100 4,272 229 5.66 943 2.06 0.6059
2020-02-11 2019-12-31 13F AMERICAN TOWER CORP COM 03027X100 4,043 230 6.03 924 7.57 0.5274
2019-10-10 2019-09-30 13F/A-1 AMERICAN TOWER CORP COM 03027X100 3,813 176 4.84 859 15.46 0.5513
2019-10-10 2019-09-30 13F AMERICAN TOWER CORP COM 03027X100 3,813 176 859
2019-08-07 2019-06-30 13F AMERICAN TOWER CORP COM 03027X100 3,637 -19 -0.52 744 3.33 0.5417
2019-05-08 2019-03-31 13F AMERICAN TOWER CORP COM 03027X100 3,656 16 0.44 720 25.00 0.5871
2019-01-15 2018-12-31 13F AMERICAN TOWER CORP COM 03027X100 3,640 36 1.00 576 9.92 0.5807
2018-11-13 2018-09-30 13F AMERICAN TOWER CORP COM 03027X100 3,604 50 1.41 524 2.34 0.4649
2018-07-27 2018-06-30 13F AMERICAN TOWER CORP COM 03027X100 3,554 538 17.84 512 16.89 0.3793
2018-04-18 2018-03-31 13F AMERICAN TOWER CORP COM 03027X100 3,016 -38 -1.24 438 0.46 0.3444
2018-02-02 2017-12-31 13F AMERICAN TOWER CORP COM 03027X100 3,054 275 9.90 436 14.74 0.3105
2017-11-13 2017-09-30 13F AMERICAN TOWER CORP COM 03027X100 2,779 111 4.16 380 7.65 0.0050
2017-07-10 2017-06-30 13F AMERICAN TOWER CORP COM 03027X100 2,668 412 18.26 353 28.83 0.3045
2017-05-04 2017-03-31 13F AMERICAN TOWER CORP COM 03027X100 2,256 -30 -1.31 274 13.22 0.2595
2017-02-15 2016-12-31 13F AMERICAN TOWER CORP COM 03027X100 2,286 2,286 242 0.2418
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2019-10-10 2019-09-30 13F/A AMERICAN TOWER CORP COM Call 0 -100.00 0 n/a n/a n/a
2019-08-07 2019-06-30 13F AMERICAN TOWER CORP COM Call 100 0 n/a n/a n/a
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.