American Tower Corp /ma/
A global owner and operator of wireless communications towers and data centers, leasing space on its sites to carriers like AT&T, T-Mobile, Verizon, and Airtel. It grew out of a broadcasting company founded in Boston in 1995, when its founder realized wireless carriers were each building duplicate towers—so he built shared ones instead, and spun the business off as its own company in 1998. It later expanded into data centers by buying CoreSite in 2021, and converted to a REIT in 2012.
5.25% Mandatory Convertible Preferred Stock, Series A
Granted 3.96M · Sold 3.31M
Granted 988.5K · Sold 669.4K
Granted 711.8K · Sold 294.9K
Granted 1.10M · Bought 88 · Sold 638.1K
Granted 593.5K · Sold 473.2K
Granted 793.4K · Sold 632.8K
Granted 231.9K · Sold 83.4K
Granted 251.1K · Bought 76 · Sold 162.5K
Granted 1.49M · Bought 2.5K · Sold 1.49M
Granted 82.5K · Sold 19.6K
Granted 239.1K · Sold 230.2K
Granted 156.1K · Sold 99.5K
Granted 360.0K · Sold 360.0K
Granted 93.0K · Sold 74.3K
Granted 34.5K · Sold 2.3K
Granted 250.6K · Sold 214.2K
Granted 15.1K · Sold 1.3K
Granted 4.0K · Sold 4.5K
Granted 42.7K · Bought 10 · Sold 17.3K
Granted 71.5K · Sold 55.5K
Granted 133.7K · Sold 111.8K
Granted 40.4K · Bought 12.9K · Sold 25.0K
Granted 121.5K · Sold 101.8K
Granted 10.2K
Granted 21.3K · Sold 6.0K
Granted 67.8K · Sold 50.0K
Granted 99.3K · Sold 87.9K
Granted 13.0K · Sold 3.4K
Granted 9.1K
Granted 6.9K · Bought 13
Granted 1.2K · Bought 5.6K
Granted 6.2K
Granted 5.3K
Granted 4.4K
Granted 84.9K · Sold 82.1K
Granted 2.3K · Bought 2.7K
Granted 2.3K
Granted 1.2K
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Taiclet James D JrFormer Chair, President & CEO · 467 transactions | — | 457.9Kas of Jun 2020 | 3.96M | — | 3.31M |
| DiSanto EdmundEVP, Spc Adv. & Counsel to CEO · 152 transactions | — | 413.3Kas of Jul 2023 | 988.5K | — | 669.4K |
| Lummis Fred RDirector · 1 transaction | — | 407.4Kas of Jan 2006 | — | — | — |
| Sharma AmitSpl. Adv. to CEO & Chm. APAC · 92 transactions | — | 363.8Kas of Jul 2021 | 711.8K | — | 294.9K |
| Bartlett Thomas AFormer Officer · 118 transactions | — | 286.7Kas of May 2024 | 1.10M | 88 | 638.1K |
| Marshall Steven C.Former Officer · 77 transactions | — | 134.8Kas of Oct 2018 | 593.5K | — | 473.2K |
| Moskowitz Steven JPresident, U.S. Operations · 148 transactions | — | 114.7Kas of Nov 2008 | 793.4K | — | 632.8K |
| Vondran Steven OPresident and CEO, Director · 68 transactions | — | 108.9K | 231.9K | — | 83.4K |
| Smith Rodney MEVP, CFO & Treasurer · 70 transactions | — | 92.5K | 251.1K | 76 | 162.5K |
| Hess William HFormer Officer · 348 transactions | — | 63.5Kas of Jul 2019 | 1.49M | 2.5K | 1.49M |
| Reed Joann ADirector · 35 transactions | — | 62.9Kas of May 2025 | 82.5K | — | 19.6K |
| Bua Jean AEVP, Finance and Treasurer · 29 transactions | — | 42.5Kas of Aug 2010 | 239.1K | — | 230.2K |
| Puech OlivierEVP & President, International · 110 transactions | — | 38.1K | 156.1K | — | 99.5K |
| Singer Bradley ECFO and Treasurer · 151 transactions | — | 35.1Kas of May 2008 | 360.0K | — | 360.0K |
| Noel Eugene MEVP & Chief Operating Officer · 15 transactions | — | 34.5K | 93.0K | — | 74.3K |
| Dowling Ruth TEVP, Chief Admin Ofr, GC & Sec · 19 transactions | — | 29.5K | 34.5K | — | 2.3K |
| Meyer Robert Joseph JRSVP & Chief Accounting Officer · 139 transactions | — | 28.8Kas of Jun 2025 | 250.6K | — | 214.2K |
| Font JuanSVP, Pres. & CEO, CoreSite · 10 transactions | — | 28.4K | 15.1K | — | 1.3K |
| Meyer Robert JosephSVP & Advisor to the CFO · 5 transactions | — | 26.3K | 4.0K | — | 4.5K |
| Goel SanjayEVP & President, Asia-Pacific · 12 transactions | — | 25.4Kas of Apr 2025 | 42.7K | 10 | 17.3K |
| Thompson Samme LDirector · 55 transactions | — | 24.3Kas of May 2024 | 71.5K | — | 55.5K |
| Reeve Pamela D ADirector · 47 transactions | — | 21.1K | 133.7K | — | 111.8K |
| Dykes Ronald MDirector · 18 transactions | — | 21.1Kas of Mar 2015 | 40.4K | 12.9K | 25.0K |
| Dolan Raymond PDirector · 44 transactions | — | 19.6Kas of May 2024 | 121.5K | — | 101.8K |
| Rossi Richard CEVP & President, U.S. Tower · 6 transactions | — | 17.5K | 10.2K | — | — |
| Macnab CraigDirector · 15 transactions | — | 15.3K | 21.3K | — | 6.0K |
| Katz CarolynDirector · 28 transactions | — | 12.9Kas of Mar 2017 | 67.8K | — | 50.0K |
| Lara GustavoDirector · 55 transactions | — | 12.5Kas of May 2022 | 99.3K | — | 87.9K |
| Hormats Robert DDirector · 35 transactions | — | 9.6K | 13.0K | — | 3.4K |
| Lieblein GraceDirector · 9 transactions | — | 9.1K | 9.1K | — | — |
| Tanner Bruce LDirector · 9 transactions | — | 6.9K | 6.9K | 13 | — |
| Reilly Eugene FDirector · 2 transactions | — | 6.9K | 1.2K | 5.6K | — |
| Frank Kenneth RDirector · 6 transactions | — | 6.2K | 6.2K | — | — |
| Clarke Teresa HillaryDirector · 5 transactions | — | 5.3K | 5.3K | — | — |
| Chambliss Kelly CDirector · 4 transactions | — | 4.4K | 4.4K | — | — |
| Sharbutt David EDirector · 48 transactions | — | 2.9Kas of May 2023 | 84.9K | — | 82.1K |
| Kalathur RajeshDirector · 3 transactions | — | 2.4K | 2.3K | 2.7K | — |
| Ray Neville RDirector · 2 transactions | — | 2.3K | 2.3K | — | — |
| Kearns MarkSVP Finance and Treasurer · 2 transactions | — | 1.2Kas of Jun 2011 | 1.2K | — | — |
Select a row to see that insider’s individual transactions. Sum of the holdings confirmed in the 12 months before this insider's last filing. A Form 4 reports a holding per line — held directly, or through a named trust, partnership or foundation, and in each share class separately — never a person’s total. Lines not restated in that time are left out and shown apart: an active filer restates what they still hold, so a line they did not restate is more often an entity since renamed, whose shares a successor line reports too. An amber marker means some were left out.
Net open-market activity over all recorded history: -9.27M shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.