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The shares were sold in multiple transactions at prices ranging from $154.31 to to $154.81.  The reporting person undertakes to provide to the Issuer, its security holders and the Staff of the SEC, upon request, full information regarding the number of shares sold at each specific price within the range reported."}],"balance_after":38168.4028,"source":{"system":"sec-edgar","filing":"0001193125-26-102473","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1018963/000119312526102473/ownership.xml","form_type":"4"}},{"id":849426,"issuer":{"id":944,"kind":"organization","name":"ATI INC","symbol":"ATI"},"owners":[{"id":10089,"kind":"person","name":"Morehouse David J","position":1,"cik":"0001635153","reported_name":"Morehouse David J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.10 per share","published_at":"2026-03-11T21:28:16.000Z","date":"2026-03-09","kind":"sale","planned":false,"acquired":false,"shares":1285,"price":153.11,"value":196746.35,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported is a weighted average price.  The shares were sold in multiple transactions at prices ranging from $152.77 to to $153.53.  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The shares were sold in multiple transactions at prices ranging from $776.29 to to $76.31.  The reporting person undertakes to provide to the Issuer, its security holders and the Staff of the SEC, upon request, full information regarding the number of shares sold at each specific price within the range reported."}],"balance_after":44777.4028,"source":{"system":"sec-edgar","filing":"0000950170-25-104276","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1018963/000095017025104276/ownership.xml","form_type":"4"}},{"id":1073355,"issuer":{"id":944,"kind":"organization","name":"ATI INC","symbol":"ATI"},"owners":[{"id":10089,"kind":"person","name":"Morehouse David J","position":1,"cik":"0001635153","reported_name":"Morehouse David J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.10 per share","published_at":"2025-08-06T21:44:26.000Z","date":"2025-08-04","kind":"sale","planned":false,"acquired":false,"shares":7700,"price":75.8,"value":583660.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported is a weighted average price.  The shares were sold in multiple transactions at prices ranging from $75.29 to to $76.27.  The reporting person undertakes to provide to the Issuer, its security holders and the Staff of the U.S. Securities and Exchange Commission (the \"SEC\"), upon request, full information regarding the number of shares sold at each specific price within the range reported."}],"balance_after":44977.4028,"source":{"system":"sec-edgar","filing":"0000950170-25-104276","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018963/000095017025104276/ownership.xml","form_type":"4"}},{"id":1138005,"issuer":{"id":944,"kind":"organization","name":"ATI INC","symbol":"ATI"},"owners":[{"id":10089,"kind":"person","name":"Morehouse David J","position":1,"cik":"0001635153","reported_name":"Morehouse David J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.10 per share","published_at":"2025-05-22T20:14:24.000Z","date":"2025-05-20","kind":"grant","planned":false,"acquired":true,"shares":3311,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Annual award of restricted stock granted under the Issuer's 2022 Incentive Plan as part of the Issuer's Director compensation program. 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The ATI common stock contributed to the fund was valued at $52.03 per share for purposes of determining the number of shares of the exchange fund issuable to Mr. Morehouse."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On February 26, 2025, for personal tax and estate planning purposes, Mr. Morehouse made an irrevocable election to contribute shares of ATI common stock to an exchange fund in exchange for shares of the exchange fund, and the shares were transferred to an escrow account pending closing of the transaction, which occurred on April 1, 2025.  The ATI common stock contributed to the fund was valued at $52.03 per share for purposes of determining the number of shares of the exchange fund issuable to Mr. Morehouse."}],"balance_after":49366,"source":{"system":"sec-edgar","filing":"0000950170-25-050444","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018963/000095017025050444/ownership.xml","form_type":"4"}},{"id":1504295,"issuer":{"id":944,"kind":"organization","name":"ATI INC","symbol":"ATI"},"owners":[{"id":10089,"kind":"person","name":"Morehouse David J","position":1,"cik":"0001635153","reported_name":"Morehouse David J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock, par value $0.10 per share","published_at":"2024-05-23T21:41:04.000Z","date":"2024-05-21","kind":"grant","planned":false,"acquired":true,"shares":4108,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Annual award of restricted stock granted under the Issuer's 2022 Incentive Plan as part of the Issuer's Director compensation program. 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