American Tower AMT
American Tower is the 139th largest S&P 500 company by market cap, worth $88.1 billion. 12 directors have filed with the SEC in the last 12 months (who counts), 1 of them an executive. 7 other officers are on file. At 30 Jun 2026, Vanguard was its largest institutional holder, with 13.6% of the company.
- CEO
- Steven O. Vondran
- Sector
- Real Estate
- Sub-industry
- Telecom Tower REITs
- Headquarters
- Boston, Massachusetts
- Founded
- 1995
- More
- Wikipedia
- Market cap
- $88.1B
- 139th largest, 23 Oct 2026 close
- Price to sales
- 8.3
- Less useful for REITs
- Employees
- 4,866
- REIT: property staff may not be counted
- Market cap per employee
- $18M
- Not comparable for REITs
- Connections
- 6
- S&P 500 companies sharing a director or officer
Largest institutional holders
Each fund group's share of American Tower. Where a company has several share classes, the share is of its total value.
13F filings for the quarter to 30 Jun 2026
Board and officers
6 people here also hold roles at other S&P 500 companies.
Roles filed up to 30 Sep 2026
| Name | Title |
|---|---|
| Directors (12) | |
| Steven O. VondranPresident and CEOAlso at AmerenLast filed 12 Mar 2026 | |
| Kelly C. ChamblissDirectorLast filed 12 Mar 2026 | |
| Teresa Hillary ClarkeDirectorAlso at Arthur J. Gallagher & Co.Last filed 12 Mar 2026 | |
| Kenneth R. FrankDirectorLast filed 12 Mar 2026 | |
| Rajesh KalathurDirectorAlso at Deere & Company | |
| Grace LiebleinDirectorAlso at Honeywell TechnologiesLast filed 12 Mar 2026 | |
| Kristen M. LudgateDirector | |
| Craig MacnabDirectorAlso at Vici PropertiesLast filed 12 Mar 2026 | |
| Neville R. RayDirectorLast filed 12 Mar 2026 | |
| Pamela D. A. ReeveDirector | |
| Eugene F. ReillyDirectorLast filed 12 Mar 2026 | |
| Bruce L. TannerDirectorAlso at Truist FinancialLast filed 12 Mar 2026 | |
| Officers (7) | |
| Robert Joseph MeyerSVP & Advisor to the CFOLast filed 31 Jul 2026 | |
| Rodney M. SmithEVP, CFO & TreasurerLast filed 12 Mar 2026 | |
| Paul BlanchettSVP & Chief Accounting OfficerLast filed 30 Apr 2026 | |
| Ruth T. DowlingEVP, Chief Admin Ofr, GC & SecLast filed 30 Jul 2026 | |
| Juan FontSVP, Pres. & CEO, CoreSiteLast filed 12 Mar 2026 | |
| Eugene M. NoelEVP & Chief Operating OfficerLast filed 12 Mar 2026 | |
| Richard C. RossiEVP & President, U.S. TowerLast filed 12 Mar 2026 | |
Companies that share people with American Tower
Each person's title here, then at the other company.
- Ameren AEE
- Steven O. Vondran: President and CEO here, Director there
- Arthur J. Gallagher & Co. AJG
- Teresa Hillary Clarke: Director here, Director there
- Deere & Company DE
- Rajesh Kalathur: Director here, President, JD Financial & CIO there
- Honeywell Technologies HON
- Grace Lieblein: Director here, Director there
- Truist Financial TFC
- Bruce L. Tanner: Director here, Director there
- Vici Properties VICI
- Craig Macnab: Director here, Director there
American Tower's market cap since December 2008
Weekly, up to 23 Oct 2026
| Week ending | Market cap |
|---|---|
| 23 Oct 2026 | $88.1B |
| 26 Dec 2025 | $82.6B |
| 27 Dec 2024 | $85.0B |
| 29 Dec 2023 | $101B |
| 30 Dec 2022 | $98.6B |
| 31 Dec 2021 | $133B |
| 25 Dec 2020 | $97.1B |
| 27 Dec 2019 | $102B |
| 28 Dec 2018 | $70.0B |
| 29 Dec 2017 | $61.2B |
| 30 Dec 2016 | $45.0B |
| 25 Dec 2015 | $41.6B |
| 26 Dec 2014 | $39.9B |
| 27 Dec 2013 | $31.1B |
| 28 Dec 2012 | $30.0B |
| 30 Dec 2011 | $23.6B |
| 31 Dec 2010 | $20.6B |
| 25 Dec 2009 | $17.4B |
| 26 Dec 2008 | $11.2B |
Download American Tower's data as JSON, with the weekly market caps in billions of dollars from 5 Dec 2008.
Workforce
Headcount at 31 Dec 2025
- Employees
- 4,866
- In the US
- 2,388
As of December 31, 2025, we employed 4,866 full-time individuals, including 2,388 employees based in the United States and 2,478 employees based internationally.
Insider trades
Open-market buys and sales by directors and officers. Grants, option exercises and shares withheld for tax are left out.
Trades from 30 Sep 2025 to 30 Sep 2026
Directors and officers sold $23.2 million of stock in 11 sales and bought $2.0 million in 3 purchases in the 12 months to 30 Sep 2026.
| Date | Person | Value |
|---|---|---|
| 21 Aug 2026Buy | Rajesh KalathurDirector | $501K |
| 29 Jul 2026Sale | Robert Joseph MeyerSVP & Advisor to the CFO | $894K |
| 29 Jul 2026Sale | Ruth T. DowlingEVP, Chief Admin Ofr, GC & Sec | $194K |
| 28 Jul 2026Sale | Ruth T. DowlingEVP, Chief Admin Ofr, GC & Sec | $116K |
| 29 Apr 2026Sale | Ruth T. DowlingEVP, Chief Admin Ofr, GC & Sec | $74K |
| 28 Apr 2026Sale | Ruth T. DowlingEVP, Chief Admin Ofr, GC & Sec | $99K |
| 10 Mar 2026Buy | Rajesh KalathurDirector | $495K |
| 4 Mar 2026Sale | Steven O. VondranPresident and CEO | $6.3M |
| 4 Mar 2026Sale | Ruth T. DowlingEVP, Chief Admin Ofr, GC & Sec | $129K |
| 2 Mar 2026Sale | Eugene M. NoelEVP & Chief Operating Officer | $7.9M |
Showing 10 of 14 trades
Trades by members of Congress and officials
Trades members of Congress and senior executive branch officials disclosed, including their families'. Amounts are filed as ranges.
Trades from 20 Oct 2023 to 20 Oct 2026
9 people disclosed 19 purchases and 21 sales of American Tower stock since October 2023.
| Date | Member or official | Amount |
|---|---|---|
| 25 Sep 2026 | Rohit KhannaHouse, D-CA 路 Sold | $1K to $15K |
| 11 Sep 2026 | Rohit KhannaHouse, D-CA 路 Bought | $1K to $15K |
| 10 Aug 2026 | Rohit KhannaHouse, D-CA 路 Sold | $1K to $15K |
| 20 Jul 2026 | Rohit KhannaHouse, D-CA 路 Sold | $1K to $15K |
| 5 Jun 2026 | Rohit KhannaHouse, D-CA 路 Bought | $1K to $15K |
| 11 May 2026 | Dwight EvansHouse, D-PA 路 Sold | $1K to $15K |
| 1 May 2026 | Rohit KhannaHouse, D-CA 路 Sold | $1K to $15K |
| 17 Apr 2026 | Richard Dean McCormickHouse, R-GA 路 Sold | $1K to $15K |
| 13 Apr 2026 | Rohit KhannaHouse, D-CA 路 Bought | $1K to $15K |
| 27 Mar 2026 | Alan ArmstrongSenate, R-OK 路 Sold | $1K to $15K |
Showing 10 of 40 trades
Not on file: no WARN layoff notices under its own name since October 2023.