ATI INC — Director's Dealing 2026

Jan 23, 2026

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: ATI INC (ATI)
CIK: 0001018963
Period of Report: 2026-01-01

Reporting Person: Foster James Robert (N/A)

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock, par value $0.10 per share	29622	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Performance Stock Units	$0.00	2025-12-31	Common Stock, par value $0.10 per share (30769)		Direct
Performance Stock Units	$0.00	2029-12-31	Common Stock, par value $0.10 per share (17094)		Direct

Footnotes

F1: Inclusive of 2,865, 2,587 and 4,194 restricted stock units awarded in 2023, 2024 and 2025, respectively, that in each case vest in three annual installments and are settled in shares of the Issuer's Common Stock upon vesting.

F2: Each Performance Stock Unit ("PSU") represents a contingent right to receive one share of the Issuer's Common Stock if the Issuer's Common Stock achieved a specified target market price (based on a 20-trading day average) on the New York Stock Exchange for at least 20 consecutive trading dates (the "20-Day Average Market Price") prior to December 31, 2025. Each PSU may result in the right to receive additional shares of the Issuer's Common Stock, up to a maximum of three shares per PSU, to the extent that the Issuer's Common Stock achieved 20-Day Average Market Prices at specified levels in excess of the target market price prior to December 31, 2025. Vested shares, if any, generally are payable in two equal installments in early 2026 and 2027.

F3: Each Performance Stock Unit ("PSU") represents a contingent right to receive one share of the Issuer's Common Stock if the Issuer's Common Stock achieves a specified target market price (based on a 10-trading day average) on the NYSE for at least 20 consecutive trading days (the "Average Market Price") prior to December 31, 2029. Each PSU may result in the right to receive additional shares of the Issuer's Common Stock, up to a maximum of three shares per PSU, to the extent that the Issuer's Common Stock acheives Average Market Prices at specified levels in excess of the target market price prior to December 31, 2029. Vested shares, if any, generally are apyable in two equal installments in early 2030 and 2031.