ATI Inc. Senior VP Timothy Harris Sells $3.47M in Common Stock Under Rule 10b5-1 Plan

Executive Summary

On August 31, 2026, Timothy J. Harris, Senior Vice President and Chief Digital and Information Officer (CDIO) of ATI Inc. ($ATI), executed an open-market sale of 16,500 shares of common stock at a price of $210.01 per share. The transaction totaled approximately $3.47 million in gross proceeds.

Key Transaction Details

• Insider: Timothy J. Harris
• Role: Senior VP and CDIO
• Transaction Date: August 31, 2026
• Filing Date: September 2, 2026
• Shares Sold: 16,500 shares
• Price per Share: $210.01
• Total Value: $3,465,165.00
• Remaining Direct Ownership: 130,187 shares

Trading Context & Significance

• 10b5-1 Trading Plan: The transaction was executed under a pre-established Rule 10b5-1 trading plan adopted on May 21, 2026, structured for personal tax and estate planning purposes.
• Ownership Impact: Mr. Harris reduced his direct equity holding by approximately 11.25%, retaining 130,187 shares following the transaction.
• Significance Rating: Medium. While the transaction represents a sizable dollar value ($3.47M), the sale was pre-scheduled under a 10b5-1 plan established over three months prior, and the insider maintains substantial equity ownership in the company.