Chambliss Kelly C 4

What Happened
Kelly C. Chambliss, a director of American Tower Corp (AMT), received a grant of 1,209 restricted stock units (RSUs) on March 10, 2026. The Form 4 reports the acquisition price as $0.00 (typical for RSU awards); these RSUs represent a contingent right to receive one share of common stock per RSU and will vest on March 10, 2027.

Key Details

• Transaction date: 2026-03-10. Report filed: 2026-03-12 (filed within the normal 2-business-day window).
• Transaction type/code: Award/Grant (A). Amount: 1,209 RSUs at $0.00 reported acquisition price.
• Vesting: RSUs vest on March 10, 2027 (per footnote).
• Shares owned after transaction: Not specified in this filing.
• Plan/authority: Granted under the 2007 Equity Incentive Plan, as amended.
• No 10b5-1 plan, tax withholding, or sale noted in this filing.

Context
RSUs are a common form of equity compensation that convert to actual shares only upon vesting; this grant does not represent an open-market purchase or sale. The reported $0.00 acquisition reflects that the units were awarded, not bought. Such awards are routine compensation and do not by themselves indicate the insider’s view on the company’s near-term stock performance.