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.
Convertible Preferred Series B
Granted 53.0K
Granted 165.8K · Sold 58.3K
Granted 164.4K · Sold 90.5K
Granted 12.2K · Sold 4.9K
Granted 50.0K · Sold 39.0K
Granted 93.0K · Sold 74.3K
Granted 29.8K · Sold 2.3K
Granted 9.3K · Sold 7.8K
Granted 15.1K · Sold 1.3K
Granted 4.0K · Sold 4.5K
Granted 25.8K · Sold 17.3K
Granted 6.1K · Sold 5.1K
Granted 13.4K · Sold 10.0K
Granted 1.1K
Granted 10.2K
Granted 3.4K
Granted 3.4K · Sold 1.0K
Granted 3.4K
Granted 3.4K
Granted 1.2K · Bought 5.6K
Granted 3.4K
Granted 3.4K
Granted 3.4K
Granted 2.3K · Bought 2.7K
Granted 2.3K
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Bartlett Thomas AFormer Officer · 3 transactions | +7.7% | 286.7Kas of May 2024 | 53.0K | — | — |
| Vondran Steven OPresident and CEO, Director · 21 transactions | +156.4% | 108.9K | 165.8K | — | 58.3K |
| Smith Rodney MEVP, CFO & Treasurer · 30 transactions | +52.6% | 92.5K | 164.4K | — | 90.5K |
| Reed Joann ADirector · 5 transactions | +13.1% | 62.9Kas of May 2025 | 12.2K | — | 4.9K |
| Puech OlivierEVP & President, International · 17 transactions | -14.4% | 38.1K | 50.0K | — | 39.0K |
| Noel Eugene MEVP & Chief Operating Officer · 15 transactions | — | 34.5K | 93.0K | — | 74.3K |
| Dowling Ruth TEVP, Chief Admin Ofr, GC & Sec · 16 transactions | +116.7% | 29.5K | 29.8K | — | 2.3K |
| Meyer Robert Joseph JRSVP & Chief Accounting Officer · 10 transactions | -7.5% | 28.8Kas of Jun 2025 | 9.3K | — | 7.8K |
| 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 · 7 transactions | +50.2% | 25.4Kas of Apr 2025 | 25.8K | — | 17.3K |
| Thompson Samme LDirector · 6 transactions | +4.7% | 24.3Kas of May 2024 | 6.1K | — | 5.1K |
| Reeve Pamela D ADirector · 8 transactions | +13.7% | 21.1K | 13.4K | — | 10.0K |
| Dolan Raymond PDirector · 1 transaction | +5.9% | 19.6Kas of May 2024 | 1.1K | — | — |
| Rossi Richard CEVP & President, U.S. Tower · 6 transactions | — | 17.5K | 10.2K | — | — |
| Macnab CraigDirector · 3 transactions | +28% | 15.3K | 3.4K | — | — |
| Hormats Robert DDirector · 6 transactions | +32.5% | 9.6K | 3.4K | — | 1.0K |
| Lieblein GraceDirector · 3 transactions | +58% | 9.1K | 3.4K | — | — |
| Tanner Bruce LDirector · 3 transactions | +93.5% | 6.9K | 3.4K | — | — |
| Reilly Eugene FDirector · 2 transactions | — | 6.9K | 1.2K | 5.6K | — |
| Frank Kenneth RDirector · 3 transactions | +118.3% | 6.2K | 3.4K | — | — |
| Clarke Teresa HillaryDirector · 3 transactions | +171.7% | 5.3K | 3.4K | — | — |
| Chambliss Kelly CDirector · 3 transactions | +312.9% | 4.4K | 3.4K | — | — |
| Kalathur RajeshDirector · 3 transactions | — | 2.4K | 2.3K | 2.7K | — |
| Ray Neville RDirector · 2 transactions | — | 2.3K | 2.3K | — | — |
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 the last 3 years: -308.0K shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.