Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in ATI held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 16.4M | $2.39B | +12.1% | 12.007% | 0.04% |
| 2 | Capital Research Global Investors | 6.2M | $896.0M | +70.6% | 4.498% | 0.14% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 6.1M | $890.8M | — | 4.472% | 0.02% |
| 4 | Capital International Investors | 5.9M | $854.9M | -65.6% | 4.297% | 0.20% |
| 5 | VANGUARD PORTFOLIO MANAGEMENT LLC | 5.8M | $846.8M | — | 4.251% | 0.04% |
| 6 | Capital World Investors | 5.7M | $831.0M | -22.3% | 4.172% | 0.11% |
| 7 | STATE STREET CORP | 5.4M | $782.7M | -3.9% | 3.930% | 0.03% |
| 8 | FMR LLC | 5.2M | $763.3M | +3.4% | 3.832% | 0.04% |
| 9 | Invesco Ltd. | 3.9M | $560.8M | +13.9% | 2.816% | 0.09% |
| 10 | VIKING GLOBAL INVESTORS LP | 3.3M | $484.8M | — | 2.434% | 1.36% |
| 11 | GEODE CAPITAL MANAGEMENT, LLC | 2.9M | $428.8M | +21.8% | 2.152% | 0.03% |
| 12 | Point72 Asset Management, L.P. | 1.9M | $282.8M | +142.9% | 1.420% | 0.40% |
| 13 | MORGAN STANLEY | 1.7M | $242.7M | +30.0% | 1.218% | 0.01% |
| 14 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.5M | $218.5M | +1.0% | 1.097% | 0.03% |
| 15 | UBS Group AG | 1.4M | $206.4M | +18.9% | 1.036% | 0.03% |
| 16 | DIMENSIONAL FUND ADVISORS LP | 1.4M | $198.7M | -35.7% | 0.998% | 0.04% |
| 17 | BANK OF AMERICA CORP /DE/ | 1.4M | $198.5M | +70.8% | 0.997% | 0.01% |
| 18 | DENDUR CAPITAL LP | 1.3M | $186.6M | -37.1% | 0.937% | 14.19% |
| 19 | NORTHERN TRUST CORP | 1.2M | $180.2M | +5.5% | 0.905% | 0.02% |
| 20 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 1.2M | $175.1M | +231.4% | 0.879% | 0.09% |
| 21 | AQR CAPITAL MANAGEMENT LLC | 1.2M | $174.1M | +19.9% | 0.893% | 0.08% |
| 22 | Holocene Advisors, LP | 1.1M | $159.7M | +2.4% | 0.801% | 0.39% |
| 23 | AMERICAN CENTURY COMPANIES INC | 1.1M | $155.5M | -32.8% | 0.781% | 0.08% |
| 24 | BOWEN HANES & CO INC | 1.0M | $151.7M | -11.4% | 0.762% | 3.69% |
| 25 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 1.0M | $150.2M | +2.5% | 0.754% | 0.20% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in ATI — a direct measure of their conviction.
Filings activity in ATI during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 654 | +18% | 64.31% | +12.22 pp | $17.48B | +23% |
| Q4 2025 | 556 | +22% | 52.09% | +15.07 pp | $14.16B | +41% |
| Q3 2025 | 454 | 0.7% | 37.02% | 3.61 pp | $10.06B | 8.9% |
| Q2 2025 | 457 | +11% | 40.63% | +16.70 pp | $11.04B | +70% |
| Q1 2025 | 413 | +4.3% | 23.93% | 2.59 pp | $6.50B | 9.8% |
| Q4 2024 | 396 | 2.7% | 26.52% | 4.36 pp | $7.21B | 14% |
| Q3 2024 | 407 | +3.3% | 30.88% | +1.00 pp | $8.39B | +3.3% |
| Q2 2024 | 394 | — | 29.88% | — | $8.12B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying ATI stock.
Based on Q1 2026 13F filings, institutional ownership of ATI Inc. stands at 64.3%, held across 654 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of ATI, with approximately 16,441,653 shares worth $2.39B as of Q1 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of ATI, including VIKING GLOBAL INVESTORS LP, Point72 Asset Management, L.P..
Our composite Smart Money Score for ATI is 75 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
166 institutions opened new positions in ATI during Q1 2026, while 68 fully exited. 393 added to existing positions and 92 trimmed.
ATI institutional ownership rose by 12.22 percentage points quarter-over-quarter, with a net change of +98 holders.
The top 10 institutions account for 53.2% of all reported 13F value in ATI, and the top 25 account for 71.0%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
ATI Inc. (ATI) Institutional Ownership