Bhatia Vaishali S. 4

What Happened
Vaishali S. Bhatia, Senior Vice President, General Counsel and Chief Compliance Officer of ATI Inc., had 3,509 shares withheld to cover taxes on vested restricted stock units (reported as a disposition) on March 20, 2026. The shares were valued at $143.95 each (the average of the high and low price that day), for a total of approximately $505,121. This was a tax-withholding event related to RSU vesting, not an open-market sale for cash proceeds.

Key Details

• Transaction date: March 20, 2026
• Transaction type/code: F — shares withheld to satisfy tax withholding obligation on RSUs
• Shares withheld/disposed: 3,509 shares at $143.95 per share
• Reported total value: $505,121 (price is the average of the NYSE high and low on 3/20/2026)
• Footnote F1: Shares withheld to pay taxes on RSUs granted March 20, 2024; one-third of those RSUs vested on March 20, 2026.
• Footnote F2: $143.95 represents the average of the high and low trading prices on the NYSE on March 20, 2026.
• Shares owned after the transaction: Not specified in the disclosed Form 4.
• Filing/timeliness: Form 4 was filed on March 24, 2026 (file date), which is within the typical two-business-day reporting window for a March 20 transaction.

Context
Tax-withholding by surrendering or withholding shares upon RSU vesting is a routine administrative action and does not necessarily indicate the insider is selling shares for investment reasons. This was not a voluntary open-market sale; it was a cashless settlement to satisfy tax obligations when RSUs vested.