Ranked by reported Q2 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. | 18.7M | $3.69B | +13.8% | 13.709% | 0.05% |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | 6.2M | $1.23B | +6.8% | 4.558% | 0.06% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 6.2M | $1.21B | +0.6% | 4.516% | 0.03% |
| 4 | Capital World Investors | 5.2M | $1.03B | -8.1% | 3.846% | 0.12% |
| 5 | STATE STREET CORP | 5.2M | $1.03B | -2.7% | 3.838% | 0.02% |
| 6 | Capital Research Global Investors | 5.1M | $1.00B | -17.3% | 3.732% | 0.14% |
| 7 | FMR LLC | 5.0M | $983.4M | -4.9% | 3.656% | 0.04% |
| 8 | Capital International Investors | 3.7M | $733.2M | -36.8% | 2.726% | 0.15% |
| 9 | Invesco Ltd. | 3.4M | $679.9M | -10.5% | 2.527% | 0.05% |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | 2.8M | $547.6M | -5.8% | 2.035% | 0.03% |
| 11 | Qube Research & Technologies Ltd | 2.1M | $422.6M | +149.7% | 1.571% | 0.39% |
| 12 | MORGAN STANLEY | 1.9M | $367.6M | +11.8% | 1.367% | 0.02% |
| 13 | BANK OF AMERICA CORP /DE/ | 1.8M | $348.3M | +29.5% | 1.295% | 0.02% |
| 14 | NORGES BANK | 1.7M | $342.9M | β | 1.275% | 0.03% |
| 15 | JANE STREET GROUP, LLC | 1.7M | $334.8M | +7.3% | 1.245% | 0.03% |
| 16 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.5M | $292.3M | -1.3% | 1.087% | 0.04% |
| 17 | AQR CAPITAL MANAGEMENT LLC | 1.4M | $282.4M | +17.2% | 1.050% | 0.10% |
| 18 | NORTHERN TRUST CORP | 1.3M | $254.0M | +4.0% | 0.944% | 0.03% |
| 19 | Point72 Asset Management, L.P. | 1.2M | $246.2M | -35.8% | 0.915% | 0.27% |
| 20 | DIMENSIONAL FUND ADVISORS LP | 1.2M | $228.7M | -15.1% | 0.850% | 0.04% |
| 21 | VIKING GLOBAL INVESTORS LP | 1.2M | $227.4M | -65.4% | 0.846% | 0.65% |
| 22 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 1.1M | $220.9M | +8.5% | 0.821% | 0.26% |
| 23 | DENDUR CAPITAL LP | 1.0M | $198.9M | -21.4% | 0.739% | 10.44% |
| 24 | BNP PARIBAS FINANCIAL MARKETS | 923K | $186.3M | +41.6% | 0.676% | 0.06% |
| 25 | MILLENNIUM MANAGEMENT LLC | 883K | $174.1M | +40.9% | 0.647% | 0.06% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in ATI β a direct measure of their conviction.
Filings activity in ATI during Q2 2026, grouped by how each filer changed its position.
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 790 | +18% | 94.23% | +0.45 pp | $24.49B | +34% |
| Q1 2026 | 669 | +19% | 93.78% | 1.36 pp | $18.24B | +26% |
| Q4 2025 | 562 | +21% | 95.14% | 0.42 pp | $14.52B | +39% |
| Q3 2025 | 463 | +1.3% | 95.56% | +1.09 pp | $10.44B | 5.5% |
| Q2 2025 | 457 | +11% | 94.47% | +2.87 pp | $11.04B | +70% |
| Q1 2025 | 413 | +4.3% | 91.60% | 3.59 pp | $6.50B | 9.8% |
| Q4 2024 | 396 | 2.7% | 95.19% | 2.10 pp | $7.21B | 14% |
| Q3 2024 | 407 | β | 97.29% | β | $8.39B | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying ATI stock.
Based on Q2 2026 13F filings, institutional ownership of ATI Inc. stands at 94.2%, held across 790 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of ATI, with approximately 18,708,922 shares worth $3.69B as of Q2 2026.
Yes β 4 widely-followed marquee investors appear among the top 25 institutional holders of ATI, including JANE STREET GROUP, LLC, Point72 Asset Management, L.P., VIKING GLOBAL INVESTORS LP, MILLENNIUM MANAGEMENT LLC.
Our composite Smart Money Score for ATI is 83 out of 100 (Strong Smart Money). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
164 institutions opened new positions in ATI during Q2 2026, while 51 fully exited. 527 added to existing positions and 75 trimmed.
ATI institutional ownership rose by 0.45 percentage points quarter-over-quarter, with a net change of +121 holders.
The top 10 institutions account for 49.6% of all reported 13F value in ATI, and the top 25 account for 66.4%.
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