ATI insider transactions

Chair, President and CEO Fields Kimberly A sold $10,698,980 worth of shares (59,749 units at $179.07) as part of a pre-agreed trading plan, decreasing direct ownership by 22% to 218,014 units (SEC Form 4)

Director Sharma Ruby was granted 905 shares, increasing direct ownership by 14% to 7,285 units (SEC Form 4)

Director Morehouse David J was granted 1,743 shares, increasing direct ownership by 5% to 38,311 units (SEC Form 4)

Director Lydon-Rodgers Jean was granted 905 shares, increasing direct ownership by 143% to 1,536 units (SEC Form 4)

Director Lund Elizabeth Hefley was granted 905 shares, increasing direct ownership by 143% to 1,536 units (SEC Form 4)

Director Kah Marianne was granted 905 shares, increasing direct ownership by 3% to 35,075 units (SEC Form 4)

Director Hess David P was granted 905 shares, increasing direct ownership by 3% to 34,945 units (SEC Form 4)

Director Corvi Carolyn was granted 905 shares, increasing direct ownership by 1% to 71,146 units (SEC Form 4)

Director Carlisle Herbert J was granted 905 shares, increasing direct ownership by 2% to 37,556 units (SEC Form 4)

Director Ball M Leroy was granted 905 shares, increasing direct ownership by 3% to 34,737 units (SEC Form 4)

President, CEO and Director Fields Kimberly A sold $6,368,238 worth of shares (40,000 units at $159.21) as part of a pre-agreed trading plan, decreasing direct ownership by 13% to 277,763 units (SEC Form 4)

SEC Form 4 filed by Bhatia Vaishali S.

SEC Form 4 filed by ATI Inc.

VP Chief Accounting Officer Miller Michael Benjamin covered exercise/tax liability with 413 shares, decreasing direct ownership by 5% to 7,639 units (SEC Form 4)

Director Ball M Leroy gifted 350 shares, decreasing direct ownership by 1% to 33,832 units (SEC Form 4)

Executive Chairman Wetherbee Robert S sold $4,541,569 worth of shares (31,276 units at $145.21), decreasing direct ownership by 18% to 269,623 units (SEC Form 4)

SVP, Finance and CFO Foster James Robert was granted 9,644 shares, converted options into 42,265 shares and covered exercise/tax liability with 23,544 shares, increasing direct ownership by 96% to 57,987 units (SEC Form 4)

New insider Foster James Robert claimed ownership of 29,622 shares (SEC Form 3)

Executive Chairman Wetherbee Robert S converted options into 362,644 shares, covered exercise/tax liability with 158,297 shares and was granted 185,276 shares (SEC Form 4)

VP Chief Accounting Officer Miller Michael Benjamin was granted 854 shares and covered exercise/tax liability with 374 shares, increasing direct ownership by 6% to 8,052 units (SEC Form 4)

President, CEO and Director Fields Kimberly A was granted 94,726 shares, converted options into 98,620 shares and covered exercise/tax liability with 78,251 shares, increasing direct ownership by 57% to 317,763 units (SEC Form 4)

Senior VP and CDIO Harris Timothy J covered exercise/tax liability with 54,560 shares, was granted 48,995 shares and converted options into 70,442 shares, increasing direct ownership by 66% to 163,187 units (SEC Form 4)

SVP, General Counsel and CCO Bhatia Vaishali S. was granted 3,152 shares and covered exercise/tax liability with 1,944 shares, increasing direct ownership by 2% to 61,929 units (SEC Form 4)

Executive Chairman Wetherbee Robert S sold $5,897,039 worth of shares (53,862 units at $109.48), decreasing direct ownership by 32% to 126,518 units (SEC Form 4)

SEC Form 4 filed by President, CEO and Director Fields Kimberly A

SEC Form 4 filed by SVP, General Counsel and CCO Bhatia Vaishali S.

SEC Form 4 filed by Senior VP and CDIO Harris Timothy J

SEC Form 4 filed by VP Chief Accounting Officer Miller Michael Benjamin

Senior VP and CDIO Harris Timothy J sold $1,031,851 worth of shares (10,542 units at $97.88), decreasing direct ownership by 10% to 98,310 units (SEC Form 4)

SVP, CHRO Busch Tina Killough sold $242,289 worth of shares (2,598 units at $93.26), decreasing direct ownership by 11% to 21,274 units (SEC Form 4)

Director Ball M Leroy gifted 185 shares, decreasing direct ownership by 0.54% to 34,182 units (SEC Form 4)

Director Lydon-Rodgers Jean was granted 631 shares (SEC Form 4)

Director Lund Elizabeth Hefley was granted 631 shares (SEC Form 4)

Executive Chairman Wetherbee Robert S sold $5,900,155 worth of shares (60,000 units at $98.34), decreasing direct ownership by 20% to 246,538 units (SEC Form 4)

Senior VP and CDIO Harris Timothy J sold $1,030,691 worth of shares (10,542 units at $97.77), decreasing direct ownership by 9% to 108,852 units (SEC Form 4)

SEC Form 3 filed by new insider Lydon-Rodgers Jean

Senior VP and CDIO Harris Timothy J sold $1,029,946 worth of shares (10,543 units at $97.69), decreasing direct ownership by 8% to 119,394 units (SEC Form 4)

SEC Form 3 filed by new insider Lund Elizabeth Hefley

Senior VP and CDIO Harris Timothy J sold $1,012,866 worth of shares (10,543 units at $96.07), decreasing direct ownership by 8% to 129,937 units (SEC Form 4)

President, CEO and Director Fields Kimberly A sold $1,816,408 worth of shares (21,153 units at $85.87), decreasing direct ownership by 9% to 202,668 units (SEC Form 4)

SVP, CHRO Busch Tina Killough covered exercise/tax liability with 2,122 shares, decreasing direct ownership by 8% to 23,872 units (SEC Form 4)

President, CEO and Director Fields Kimberly A sold $1,735,263 worth of shares (21,154 units at $82.03), decreasing direct ownership by 9% to 223,821 units (SEC Form 4)

President, CEO and Director Fields Kimberly A sold $1,631,663 worth of shares (20,312 units at $80.33), decreasing direct ownership by 8% to 244,975 units (SEC Form 4)

President & CEO Fields Kimberly A sold $1,235,746 worth of shares (15,941 units at $77.52), decreasing direct ownership by 6% to 265,287 units (SEC Form 4)

Director Morehouse David J sold $598,920 worth of shares (7,900 units at $75.81), decreasing direct ownership by 15% to 44,777 units (SEC Form 4)

Executive Chairman Wetherbee Robert S sold $3,733,165 worth of shares (50,000 units at $74.66), decreasing direct ownership by 14% to 306,538 units (SEC Form 4)

Executive Chairman Wetherbee Robert S sold $4,196,522 worth of shares (50,000 units at $83.93), decreasing direct ownership by 12% to 356,538 units (SEC Form 4)

Executive Chairman Wetherbee Robert S sold $4,082,000 worth of shares (50,000 units at $81.64), decreasing direct ownership by 11% to 406,538 units (SEC Form 4)

Director Sharma Ruby was granted 1,655 shares, increasing direct ownership by 35% to 6,380 units (SEC Form 4)

Director Morehouse David J was granted 3,311 shares, increasing direct ownership by 7% to 52,677 units (SEC Form 4)

Director Kah Marianne was granted 1,655 shares, increasing direct ownership by 5% to 34,170 units (SEC Form 4)

Director Hess David P was granted 3,509 shares, increasing direct ownership by 11% to 34,040 units (SEC Form 4)

Director Harvey J Brett was granted 4,039 shares, increasing direct ownership by 4% to 98,866 units (SEC Form 4)

Director Corvi Carolyn was granted 1,655 shares, increasing direct ownership by 2% to 70,241 units (SEC Form 4)

Director Carlisle Herbert J was granted 1,655 shares, increasing direct ownership by 5% to 36,651 units (SEC Form 4)

Director Ball M Leroy was granted 1,655 shares, increasing direct ownership by 5% to 34,367 units (SEC Form 4)

Executive Chairman Wetherbee Robert S sold $3,768,749 worth of shares (50,000 units at $75.37), decreasing direct ownership by 10% to 456,536 units (SEC Form 4)

Executive Chairman Wetherbee Robert S sold $3,409,133 worth of shares (50,000 units at $68.18), decreasing direct ownership by 9% to 506,538 units (SEC Form 4)

Director Morehouse David J sold $884,510 worth of shares (17,000 units at $52.03), decreasing direct ownership by 26% to 49,366 units (SEC Form 4)

VP Chief Accounting Officer Miller Michael Benjamin covered exercise/tax liability with 413 shares, decreasing direct ownership by 5% to 7,572 units (SEC Form 4)