American Tower Officer Files Form 144 to Sell $290K in Common Stock

Overview

On October 28, 2026, Ruth T Dowling, an Officer of American Tower Corporation (NYSE: AMT), filed a Form 144 notice of proposed sale covering 1,578 shares of common stock with an aggregate market value of approximately $290,083.74 (~$183.83 per share).

Transaction Details

• Shares Proposed for Sale: 1,578
• Approximate Sale Date: October 28, 2026
• Broker: Morgan Stanley Smith Barney LLC Executive Financial Services
• Nature of Acquisition: The underlying shares were acquired through restricted stock unit (RSU) vestings between March 10, 2023, and March 10, 2025.
• Trading Plan: The proposed sale is executed pursuant to a pre-arranged Rule 10b5-1 trading plan adopted on October 29, 2025.
• Past 3 Months Activity: The filer reported one prior sale under the plan on July 29, 2026, comprising 1,106 shares for gross proceeds of $193,505.76.

Impact & Significance

The filing is classified as Low trading significance due to the modest transaction size ($290K) relative to American Tower's overall share float and market capitalization. Furthermore, the transaction is governed by a long-standing Rule 10b5-1 plan adopted nearly a full year prior, indicating routine liquidity management and equity compensation realization rather than a discretionary market-timing action.