ATI Inc. (ATI)
Who owns ATI Inc. (ATI)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 98.9% of the shares are freely tradable; institutional investors hold 96.9%.
Ownership Structure
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 12.05 | 16,441,653 | +12.1 | 03/31/2026 |
| Vanguard Group Inc | 9.33 | 12,726,524 | -2.5 | 12/31/2025 |
| Capital Research Global Investors | 4.51 | 6,160,107 | +70.6 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.49 | 6,124,128 | +0.0 | 03/31/2026 |
| Capital Research & Mgmt Co - Division 3 | 4.31 | 5,883,949 | -65.6 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 4.27 | 5,821,508 | +0.0 | 03/31/2026 |
| Capital World Investors | 4.19 | 5,712,929 | -22.3 | 03/31/2026 |
| State Street Corp | 3.94 | 5,381,013 | -3.9 | 03/31/2026 |
| FMR Inc | 3.84 | 5,247,175 | +3.4 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Mid-Cap ETF | 3.38 | 4,609,074 | +0.0 | 05/29/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 28. Jul 2026 | Fields Kimberly A | Chair, President and CEO | Sell | 31,757 | 190.99 | 6,065,269 |
| 7. Jul 2026 | Fields Kimberly A | Chair, President and CEO | Sell | 400 | 187.50 | 75,000 |
| 7. Jul 2026 | Fields Kimberly A | Chair, President and CEO | Sell | 388 | 185.10 | 71,819 |
| 7. Jul 2026 | Fields Kimberly A | Chair, President and CEO | Sell | 4,878 | 184.34 | 899,211 |
| 7. Jul 2026 | Fields Kimberly A | Chair, President and CEO | Sell | 15,908 | 183.50 | 2,919,118 |
| 7. Jul 2026 | Fields Kimberly A | Chair, President and CEO | Sell | 11,826 | 182.66 | 2,160,137 |
| 7. Jul 2026 | Fields Kimberly A | Chair, President and CEO | Sell | 2,200 | 181.36 | 398,992 |
| 7. Jul 2026 | Fields Kimberly A | Chair, President and CEO | Sell | 200 | 186.36 | 37,272 |
| 7. Jul 2026 | Fields Kimberly A | Chair, President and CEO | Sell | 2,000 | 180.00 | 360,000 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character.
View all insider transactions →Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.