Fields Kimberly A 4

What Happened Kimberly A. Fields, President, CEO and Director of ATI Inc (ATI), sold a total of 40,000 shares in open-market transactions on May 11, 2026 for aggregate proceeds of approximately $6,368,239. The sales occurred in seven tranches:

• 1,300 shares @ $154.02 = $200,226 (weighted avg; range $153.82–$154.65)
• 5,568 shares @ $156.29 = $870,223 (weighted avg; range $155.78–$156.76)
• 3,350 shares @ $157.51 = $527,659 (weighted avg; range $156.91–$157.90)
• 6,420 shares @ $158.38 = $1,016,800 (weighted avg; range $157.91–$158.88)
• 2,600 shares @ $159.38 = $414,388 (weighted avg; range $158.94–$159.84)
• 11,982 shares @ $160.60 = $1,924,309 (weighted avg; range $159.99–$160.98)
• 8,780 shares @ $161.12 = $1,414,634 (weighted avg; range $160.99–$161.38)
  These sales were made pursuant to a 10b5-1 trading plan dated February 5, 2026.

Key Details

• Transaction date: May 11, 2026; Form 4 filed May 12, 2026 (timely filing).
• Total shares sold: 40,000; total proceeds: ~$6.37 million.
• Reported prices are weighted averages for each tranche; detailed per-trade prices range from $153.82 to $161.38 (see footnotes F2–F8).
• Sale executed under a 10b5-1 plan (footnote F1) established for personal tax and estate planning.
• Shares owned after the transaction: not disclosed in the provided filing excerpt.
• Filing does not indicate any option exercise, gift, or tax-withholding disposition related to these trades.

Context Sales made under pre-established 10b5-1 plans are common for executives to manage tax/estate needs and are generally considered routine rather than a clear signal of management’s view of the company. Weighted-average prices and the multiple-trade ranges mean the reported averages mask smaller fills at different prices; the filer offers to provide exact per-trade details upon request (per the footnotes). Retail investors should note the size of the sale but avoid inferring company outlook solely from a planned disposition.