American Tower Corporation officer Ruth T. Dowling filed a Form 144 notice on October 28, 2026, disclosing a proposed sale of 1,578 shares of common stock on the New York Stock Exchange.

Key Highlights

  • Proposed sale: 1,578 shares of American Tower Corporation common stock with an aggregate market value of $290,083.74.
  • Seller: Ruth T. Dowling, identified as an officer of the issuer.
  • Source of shares: Securities were acquired through restricted stock units granted by the issuer, with vesting occurring between March 10, 2023 and March 10, 2025.
  • Approximate sale date: October 28, 2026, through broker Morgan Stanley Smith Barney LLC Executive Financial Services.
  • Rule 10b5-1 plan: The sale is made under a written trading plan adopted on October 29, 2025.
  • Prior sales: Dowling sold 1,106 shares on July 29, 2026, for gross proceeds of $193,505.76 under a 10b5-1 plan, according to the filing.
  • Shares outstanding: The filing reports 463,763,555 shares of common stock outstanding.

American Tower Officer Files Notice of Proposed Common Stock Sale

According to the Form 144 filed with the U.S. Securities and Exchange Commission, Ruth T. Dowling, an officer of American Tower Corporation (NYSE:AMT), intends to sell 1,578 shares of the company's common stock. The aggregate market value of the proposed sale is listed as $290,083.74. The filing identifies Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004, as the broker for the transaction.

The filing discloses that the shares to be sold were originally acquired as restricted stock units from the issuer, with an acquisition date of March 10, 2023, and a payment date also listed as March 10, 2023. The remarks section states that "the securities to be sold were acquired upon the vesting of restricted stock units during the period of 03/10/2023 through 03/10/2025." The proposed sale is conducted under a Rule 10b5-1 written trading plan, with a plan adoption date of October 29, 2025.

The filing also discloses sales activity in the prior three months. Dowling sold 1,106 shares of common stock on July 29, 2026, generating gross proceeds of $193,505.76, also under a 10b5-1 plan. American Tower Corporation's issuer address is listed as 222 Berkeley Street, Boston, Massachusetts 02116, and the SEC file number cited in the filing is 001-14195.

What Was Disclosed

Ruth T. Dowling, an officer of American Tower Corporation, filed a Form 144 on October 28, 2026, proposing to sell 1,578 shares of common stock valued at $290,083.74, acquired through restricted stock unit vesting, under a 10b5-1 plan adopted October 29, 2025.