Form4insider filings, from the source

Company · CIK 0001018963 · SIC 3317 — Steel Pipe & Tubes · NYSE

ATI INC · ATI

Insider activity reported against this company. All insider holders · On EDGAR ↗

1M3M6M1Y2YAll datashares as filed — not split-adjusted
Open-market buys & salesbuys $0 · 0sales $34.8M · 9net −$34.8M
$10k$10k$100k$100k$1M$1M$10M$10MbuyssalesJun 28Jul 13Jul 28Aug 13Aug 28Sep 13Sep 28

Reported at this company — common stock

TradeReported (ET)InsiderSharesAvg priceTotalOwned afterΔ stakeFlags
Sep 21, 2026 SForm 4 →Sep 23, 10:32 am EDTTimothy J HarrisSenior VP and CDIO9,000$191.82$1,726,38088,187−9.26%10b5-1
Sep 14, 2026 SForm 4 →Sep 16, 8:20 pm EDTTimothy J HarrisSenior VP and CDIO16,500$193.06$3,185,49097,187−14.5%10b5-1
Sep 8, 2026 SForm 4 →Sep 10, 4:12 pm EDTTimothy J HarrisSenior VP and CDIO16,500$207.54$3,424,410113,687−12.7%10b5-1
Sep 2, 2026 SForm 4 →Sep 4, 4:24 pm EDTDavid J MorehouseDirector2,485$201.61$501,00135,826−6.49%
Aug 31, 2026 SForm 4 →Sep 2, 5:41 pm EDTTimothy J HarrisSenior VP and CDIO16,500$210.01$3,465,165130,187−11.2%10b5-1
Aug 24, 2026 SForm 4 →Aug 26, 3:57 pm EDTTimothy J HarrisSenior VP and CDIO16,500$206.92$3,414,180146,687−10.1%10b5-1
Aug 17, 2026 SForm 4 →Aug 19, 5:05 pm EDTKimberly A FieldsChair, President and CEO, Director24,845$231.19$5,744,009100,719−19.8%10b5-1
Jul 28, 2026 SForm 4 →Jul 30, 4:43 pm EDTKimberly A FieldsChair, President and CEO, Director31,757$190.99$6,065,269125,564−20.2%10b5-1
Jul 7, 2026 SForm 4 →Jul 9, 4:33 pm EDTKimberly A FieldsChair, President and CEO, Director40,000$182.91$7,316,218157,321−20.3%10b5-1
Jul 1, 2026 MForm 4 →Jul 6, 4:54 pm EDTJames Robert FosterSVP, Finance and CFO163$193.82$31,59357,824—

Reported at this company — derivatives (options, RSUs, warrants)

No reported derivative activity in this period.