As of September 29, 2026, the three largest insider holders of ATI are Robert S Wetherbee (Executive Chairman, 269.62K shares), Donald P Newman (Evp And Cfo, 249.11K shares), Kimberly A Fields (President Ceo, 200.63K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Kimberly A Fields | Chair, President And Ceo | 301,352 | 0 | 301,352 | 15.1% | 19 Aug, 2026 |
| 2 | Robert S Wetherbee | Executive Chairman | 269,623 | 0 | 269,623 | 13.5% | 19 Feb, 2026 |
| 3 | Donald P Newman | Evp And Cfo | 249,111 | 0 | 249,111 | 12.5% | 07 Jan, 2025 |
| 4 | Elizabeth C Powers | Senior Vp, Chro | 167,578 | 0 | 167,578 | 8.4% | 02 Mar, 2022 |
| 5 | Kevin B Kramer | Sr. Vp, Ccmo | 160,338 | 0 | 160,338 | 8.0% | 18 Apr, 2022 |
| 6 | Elliot S Davis | Chief Legal Compl. Officer | 123,927 | 0 | 123,927 | 6.2% | 04 Mar, 2024 |
| 7 | J Brett Harvey | Director | 98,866 | 0 | 98,866 | 5.0% | 22 May, 2025 |
| 8 | Timothy J Harris | Senior Vp And Cdio | 88,187 | 0 | 88,187 | 4.4% | 22 Sep, 2026 |
| 9 | Carolyn Corvi | Director | 71,146 | 0 | 71,146 | 3.6% | 21 May, 2026 |
| 10 | Karl D Schwartz | Vp, Controller Cao | 62,833 | 0 | 62,833 | 3.1% | 14 Sep, 2022 |
| 11 | Vaishali S. Bhatia | Svp, General Counsel And Cco | 58,420 | 0 | 58,420 | 2.9% | 24 Mar, 2026 |
| 12 | James Robert Foster | Svp, Finance And Cfo | 57,824 | 0 | 57,824 | 2.9% | 06 Jul, 2026 |
| 13 | James C Diggs | Director | 46,591 | 0 | 46,591 | 2.3% | 12 Sep, 2023 |
| 14 | Herbert J Carlisle | Director | 37,556 | 0 | 37,556 | 1.9% | 21 May, 2026 |
| 15 | David J Morehouse | Director | 35,826 | 0 | 35,826 | 1.8% | 04 Sep, 2026 |
| 16 | Marianne Kah | Director | 35,075 | 0 | 35,075 | 1.8% | 21 May, 2026 |
| 17 | David P Hess | Director | 34,945 | 0 | 34,945 | 1.8% | 21 May, 2026 |
| 18 | M Leroy Ball | Director | 34,737 | 0 | 34,737 | 1.7% | 21 May, 2026 |
| 19 | Tina Killough Busch | Svp, Chro | 21,274 | 0 | 21,274 | 1.1% | 25 Nov, 2025 |
| 20 | Netta Washington | Evp, Hpmc | 11,894 | 0 | 11,894 | 0.6% | 03 May, 2024 |
| 21 | Jimmy Jr. Williams | Svp, Cto | 11,620 | 0 | 11,620 | 0.6% | 07 Jan, 2025 |
| 22 | Michael Benjamin Miller | Vp Chief Accounting Officer | 7,639 | 0 | 7,639 | 0.4% | 03 Mar, 2026 |
| 23 | Ruby Sharma | Director | 7,285 | 0 | 7,285 | 0.4% | 21 May, 2026 |
| 24 | Elizabeth Hefley Lund | Director | 1,536 | 0 | 1,536 | 0.1% | 21 May, 2026 |
| 25 | Jean Lydon-Rodgers | Director | 1,536 | 0 | 1,536 | 0.1% | 21 May, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 21 Sep, 2026 | Timothy J Harris | Senior Vp And Cdio | Disposed S | 9,000 | $191.82 | $1.73Mn | 88,187 | Direct |
| 08 Sep, 2026 | Timothy J Harris | Senior Vp And Cdio | Disposed S | 16,500 | $207.54 | $3.42Mn | 113,687 | Direct |
| 02 Sep, 2026 | David J Morehouse | Director | Disposed S | 2,485 | $201.61 | $501.00K | 35,826 | Direct |
| 31 Aug, 2026 | Timothy J Harris | Senior Vp And Cdio | Disposed S | 16,500 | $210.01 | $3.47Mn | 130,187 | Direct |
| 24 Aug, 2026 | Timothy J Harris | Senior Vp And Cdio | Disposed S | 16,500 | $206.92 | $3.41Mn | 146,687 | Direct |
| 17 Aug, 2026 | Kimberly A Fields | Chair, President And Ceo | Disposed S | 1,000 | $228.32 | $228.32K | 124,564 | Direct |
| 17 Aug, 2026 | Kimberly A Fields | Chair, President And Ceo | Disposed S | 2,000 | $229.56 | $459.12K | 122,564 | Direct |
| 17 Aug, 2026 | Kimberly A Fields | Chair, President And Ceo | Disposed S | 8,131 | $230.66 | $1.88Mn | 114,433 | Direct |
| 17 Aug, 2026 | Kimberly A Fields | Chair, President And Ceo | Disposed S | 9,116 | $231.72 | $2.11Mn | 105,317 | Direct |
| 17 Aug, 2026 | Kimberly A Fields | Chair, President And Ceo | Disposed S | 4,598 | $232.43 | $1.07Mn | 100,719 | Direct |
| 28 Jul, 2026 | Kimberly A Fields | Chair, President And Ceo | Disposed S | 31,757 | $190.99 | $6.07Mn | 125,564 | Direct |
| 07 Jul, 2026 | Kimberly A Fields | Chair, President And Ceo | Disposed S | 2,000 | $179.25 | $358.50K | 195,321 | Direct |
| 07 Jul, 2026 | Kimberly A Fields | Chair, President And Ceo | Disposed S | 2,000 | $180.00 | $360.00K | 193,321 | Direct |
| 07 Jul, 2026 | Kimberly A Fields | Chair, President And Ceo | Disposed S | 200 | $180.85 | $36.17K | 193,121 | Direct |
| 07 Jul, 2026 | Kimberly A Fields | Chair, President And Ceo | Disposed S | 2,200 | $181.36 | $398.99K | 190,921 | Direct |
| 07 Jul, 2026 | Kimberly A Fields | Chair, President And Ceo | Disposed S | 11,826 | $182.66 | $2.16Mn | 179,095 | Direct |
| 07 Jul, 2026 | Kimberly A Fields | Chair, President And Ceo | Disposed S | 15,908 | $183.50 | $2.92Mn | 163,187 | Direct |
| 07 Jul, 2026 | Kimberly A Fields | Chair, President And Ceo | Disposed S | 4,878 | $184.34 | $899.21K | 158,309 | Direct |
| 07 Jul, 2026 | Kimberly A Fields | Chair, President And Ceo | Disposed S | 388 | $185.10 | $71.82K | 157,921 | Direct |
| 07 Jul, 2026 | Kimberly A Fields | Chair, President And Ceo | Disposed S | 200 | $186.36 | $37.27K | 157,721 | Direct |