ATI
ATI · NYSE
$183.07−$6.21 (−3.28%)TodayMarket closed ·
Prev close $189.28
Who owns ATI
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 41.7% of ATI’s shares.
- BlackRock Institutional Trust Company, N.A.11.2%
- Vanguard Portfolio Management, LLC4.6%
- Vanguard Capital Management, LLC4.5%
- Capital World Investors3.8%
- Next 6 largest institutions17.6%
- All other shareholders58.3%
| Holder | Shares | % of shares |
|---|---|---|
| BlackRock Institutional Trust Company, N.A. | 15.33M | 11.23% |
| Vanguard Portfolio Management, LLC | 6.22M | 4.56% |
| Vanguard Capital Management, LLC | 6.16M | 4.52% |
| Capital World Investors | 5.25M | 3.85% |
| State Street Investment Management (US) | 5.24M | 3.84% |
| Capital Research Global Investors | 5.09M | 3.73% |
| Fidelity Management & Research Company LLC | 4.80M | 3.52% |
| Capital International Investors | 3.72M | 2.73% |
| Geode Capital Management, L.L.C. | 2.78M | 2.04% |
| Invesco Capital Management LLC | 2.34M | 1.71% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| iShares Core S&P Mid-Cap ETF | 4.78M | 3.50% |
| Vanguard Total Stock Market Index Fund | 4.35M | 3.18% |
| American Funds SMALLCAP World Fund | 4.21M | 3.09% |
| Vanguard Small-Cap Index Fund | 3.14M | 2.30% |
| Vanguard Small-Cap Growth Index Fund | 1.81M | 1.33% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $56.06M (38 trades) of ATI on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Harris Timothy J | Sale | 9.00K | $1.73M |
| Harris Timothy J | Sale | 16.50K | $3.19M |
| Harris Timothy J | Sale | 16.50K | $3.42M |
| Morehouse David J | Sale | 2.48K | $501.00K |
| Harris Timothy J | Sale | 16.50K | $3.47M |
| Harris Timothy J | Sale | 16.50K | $3.41M |
| Fields Kimberly A | Sale | 4.60K | $1.07M |
| Fields Kimberly A | Sale | 9.12K | $2.11M |
| Fields Kimberly A | Sale | 8.13K | $1.88M |
| Fields Kimberly A | Sale | 2.00K | $459.12K |
Short interest
Settled Sep 30, 2026
- Shares short
- 4.74M
- Days to cover
- 2.77
- % of shares outstanding
- 3.47%
- Average daily volume
- 1.71M
- Change since last report
- +9.3%
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