ATI Inc. (ATI) Ownership
ATI ownership summary
as of October 18, 2026- Institutions
- 96.1% of shares outstanding
- Insiders
- 0.82% of shares outstanding
- Shares outstanding
- 136.2M
- Float
- 134.9M shares available to trade
- Short interest
- 5.30% 4.7M shares short
- Days to cover
- 2.35 short interest up 28.1% vs prior month
- Institutions 96.08%
- Insiders 0.82%
- Other investors 3.10%
ATI top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 13.74% | 18.7M | $3.47B | +2.3M (+13.8%) | June 30, 2026 |
| 2 | Vanguard Portfolio Management, LLC | 4.57% | 6.2M | $1.15B | +398,367 (+6.8%) | June 30, 2026 |
| 3 | Vanguard Capital Management, LLC | 4.53% | 6.2M | $1.14B | +38,290 (+0.6%) | June 30, 2026 |
| 4 | Capital World Investors | 3.85% | 5.2M | $974.2M | −463,680 (−8.1%) | June 30, 2026 |
| 5 | State Street Corp | 3.85% | 5.2M | $972.0M | −143,714 (−2.7%) | June 30, 2026 |
| 6 | Capital Research Global Investors | 3.74% | 5.1M | $945.4M | −1.1M (−17.3%) | June 30, 2026 |
| 7 | FMR Inc | 3.66% | 5.0M | $925.9M | −258,004 (−4.9%) | June 30, 2026 |
| 8 | Capital Research & Mgmt Co - Division 3 | 2.73% | 3.7M | $690.3M | −2.2M (−36.8%) | June 30, 2026 |
| 9 | Amvescap Plc. | 2.53% | 3.4M | $640.2M | −406,352 (−10.5%) | June 30, 2026 |
| 10 | Geode Capital Management, LLC | 2.04% | 2.8M | $515.5M | −169,813 (−5.8%) | June 30, 2026 |
| 11 | Qube Research & Technologies | 1.57% | 2.1M | $397.9M | +1.3M (+149.6%) | June 30, 2026 |
| 12 | Morgan Stanley - Brokerage Accounts | 1.37% | 1.9M | $346.2M | +196,587 (+11.8%) | June 30, 2026 |
| 13 | Bank of America Corp | 1.30% | 1.8M | $327.9M | +402,106 (+29.5%) | June 30, 2026 |
| 14 | NORGES BANK | 1.28% | 1.7M | $322.9M | +7,689 (+0.4%) | June 30, 2026 |
| 15 | Charles Schwab Investment Management Inc | 1.09% | 1.5M | $275.3M | −18,876 (−1.3%) | June 30, 2026 |
| 16 | AQR Capital Management LLC | 1.05% | 1.4M | $265.9M | +210,355 (+17.2%) | June 30, 2026 |
| 17 | Jane Street Group LLC | 1.04% | 1.4M | $261.9M | −80,333 (−5.4%) | June 30, 2026 |
| 18 | Assenagon Asset Management SA | 0.97% | 1.3M | $243.9M | +730,204 (+125.0%) | June 30, 2026 |
| 19 | Northern Trust Corp | 0.95% | 1.3M | $239.2M | +49,577 (+4.0%) | June 30, 2026 |
| 20 | Point72 Asset Management, L.P. | 0.91% | 1.2M | $230.2M | −692,231 (−35.8%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 10 holders added 5.6M shares and 10 cut 5.5M.
ATI top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | iShares Core S&P Mid-Cap ETF | 3.56% | 4.9M | $900.2M | −1,728 (−0.0%) | September 30, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 3.18% | 4.3M | $804.6M | −9,905 (−0.2%) | August 31, 2026 |
| 3 | American Funds SMALLCAP World A | 2.95% | 4.0M | $745.0M | −196,525 (−4.7%) | September 30, 2026 |
| 4 | Vanguard Small Cap Index | 2.25% | 3.1M | $568.8M | −75,267 (−2.4%) | September 30, 2026 |
| 5 | American Funds Growth Fd of Amer A | 1.44% | 2.0M | $364.9M | +302,896 (+18.2%) | September 30, 2026 |
| 6 | Vanguard MStar Small Cap Growth Indx Inv | 1.25% | 1.7M | $316.4M | −97,064 (−5.4%) | September 30, 2026 |
| 7 | American Funds American Balanced A | 1.16% | 1.6M | $293.4M | — | September 30, 2026 |
| 8 | American Funds IS® Asset Allocation 1 | 1.13% | 1.5M | $284.9M | −177,575 (−10.4%) | September 30, 2026 |
| 9 | iShares Large Cap Core Active ETF | 1.10% | 1.5M | $277.3M | +8,058 (+0.5%) | September 30, 2026 |
| 10 | Invesco S&P MidCap Momentum ETF | 1.09% | 1.5M | $274.4M | — | September 30, 2026 |
| 11 | iShares US Aerospace & Defense ETF | 0.94% | 1.3M | $237.8M | −2,190 (−0.2%) | September 30, 2026 |
| 12 | CQS Dynamic Credit Multi asset F GBP | 0.87% | 1.2M | $219.9M | — | July 31, 2026 |
| 13 | Global X US Infrastructure Dev ETF | 0.82% | 1.1M | $208.2M | +7,920 (+0.7%) | September 30, 2026 |
| 14 | State Street® SPDR® S&P MIDCAP 400® ETF | 0.74% | 1.0M | $186.9M | +8,809 (+0.9%) | September 30, 2026 |
| 15 | American Funds AMCAP A | 0.72% | 980K | $181.9M | −157,240 (−13.8%) | September 30, 2026 |
| 16 | American Funds Cptl Wld Gr&Inc A | 0.61% | 829K | $153.9M | +623,259 (+302.8%) | September 30, 2026 |
| 17 | Stt Strt® SPDR® S&P® Arspc & Dfnc ETF | 0.59% | 808K | $150.0M | +1,686 (+0.2%) | September 30, 2026 |
| 18 | iShares S&P Mid-Cap 400 Growth ETF | 0.58% | 786K | $145.9M | −838 (−0.1%) | September 30, 2026 |
| 19 | American Funds New Perspective A | 0.57% | 775K | $143.9M | +439,164 (+130.7%) | September 30, 2026 |
| 20 | iShares Russell Mid-Cap Growth ETF | 0.56% | 761K | $141.3M | −813 (−0.1%) | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
ATI insider transactions
latest 18| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-09 | David J Morehouse | Sell | $154.25 | 6,609 | $1.0M |
| 2025-12-18 | Robert S Wetherbee | Sell | $109.48 | 53,862 | $5.9M |
| 2025-11-25 | Timothy J Harris | Sell | $97.88 | 10,542 | $1.0M |
| 2025-11-21 | Tina Killough Busch | Sell | $93.26 | 2,598 | $242,289 |
| 2025-11-18 | Robert S Wetherbee | Sell | $98.34 | 60,000 | $5.9M |
| 2025-11-18 | Timothy J Harris | Sell | $97.77 | 10,542 | $1.0M |
| 2025-11-11 | Timothy J Harris | Sell | $97.69 | 10,543 | $1.0M |
| 2025-11-04 | Timothy J Harris | Sell | $96.07 | 10,543 | $1.0M |
| 2025-10-15 | Kimberly A Fields | Sell | $85.87 | 21,153 | $1.8M |
| 2025-10-06 | Kimberly A Fields | Sell | $82.03 | 21,154 | $1.7M |
| 2025-09-22 | Kimberly A Fields | Sell | $80.33 | 20,312 | $1.6M |
| 2025-09-09 | Kimberly A Fields | Sell | $77.52 | 15,941 | $1.2M |
| 2025-08-05 | Robert S Wetherbee | Sell | $74.66 | 50,000 | $3.7M |
| 2025-08-04 | David J Morehouse | Sell | $75.81 | 7,900 | $598,899 |
| 2025-06-12 | Robert S Wetherbee | Sell | $83.93 | 50,000 | $4.2M |
| 2025-06-03 | Robert S Wetherbee | Sell | $81.64 | 50,000 | $4.1M |
| 2025-05-20 | Robert S Wetherbee | Sell | $75.31 | 45,359 | $3.4M |
| 2025-05-06 | Robert S Wetherbee | Sell | $68.18 | 50,000 | $3.4M |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
ATI shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns ATI
Institutional investors own 96.1% of ATI's shares and insiders 0.82%. The largest holder is BlackRock Inc with 13.74% of the shares (18.7M), as of June 30, 2026. Among the top 20 institutions, 10 added shares and 10 reduced their stake in the latest filings. Short interest is 5.30% of the float, or 2.35 days of average trading volume. The share count rose 29.2% since 2014.
Related: ATI analyst forecast, ATI key metrics. See the ATI stock overview for the latest quote and news.
ATI ownership FAQ
Who owns the most ATI stock?
The largest shareholders of ATI are BlackRock Inc (13.74%), Vanguard Portfolio Management, LLC (4.57%), Vanguard Capital Management, LLC (4.53%), Capital World Investors (3.85%), State Street Corp (3.85%).
What percentage of ATI is owned by institutions?
Institutions hold 96.1% of ATI's shares outstanding; insiders hold 0.82%.
Which funds own ATI?
The largest fund holders of ATI are iShares Core S&P Mid-Cap ETF (3.56%), Vanguard MStar Total Stk Mkt Idx Invest (3.18%), American Funds SMALLCAP World A (2.95%), Vanguard Small Cap Index (2.25%), American Funds Growth Fd of Amer A (1.44%).
What is ATI's short interest?
4.7M shares of ATI were sold short, 5.30% of the float; at the average daily volume it would take 2.35 days to cover.
Are insiders buying or selling ATI?
Of the latest 18 reported insider transactions in ATI (since May 6, 2025), 0 were purchases and 18 were sales.
How many shares of ATI are outstanding?
ATI has 136.2M shares outstanding, of which 134.9M are in the public float.