Ati Inc
ATI- Exchange
- NYSE
- Industry
- Steel Pipe & Tubes
- SEC CIK
- 0001018963
In the last 90 days, Ati Inc insiders filed 0 open-market purchases and 9 sales; 795 institutions reported holding it in 13F filings for Q2 2026, worth $25.1B in total; 3 superinvestors hold it, including Viking Global Investors and Soros Fund Management.
13F holders, Q1 2026
Institutional positions in Ati Inc as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 678
- +116 vs. Q4 2025
- Shares held
- 127.4M
- +13.8M (+12.2%) vs. Q4 2025
- Total value
- $18.5B
- +$5.46B (+41.9%) vs. Q4 2025
- New holders
- 167
- 246 more added
- Sold out
- 51
- 189 more reduced
8 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting ATI on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 795 | $25.1B |
| Q1 2026 | 678 | $18.5B |
| Q4 2025 | 570 | $14.7B |
| Q3 2025 | 470 | $10.5B |
| Q2 2025 | 473 | $11.6B |
| Q1 2025 | 426 | $6.97B |
| Q4 2024 | 403 | $7.51B |
| Q3 2024 | 421 | $8.89B |
| Q2 2024 | 403 | $7.33B |
| Q1 2024 | 345 | $6.89B |
| Q4 2023 | 349 | $6.10B |
| Q3 2023 | 338 | $5.48B |
| Q2 2023 | 329 | $5.95B |
| Q1 2023 | 339 | $5.29B |
| Q4 2022 | 304 | $3.95B |
| Q3 2022 | 290 | $3.49B |
| Q2 2022 | 266 | $3.02B |
| Q1 2022 | 284 | $3.51B |
| Q4 2021 | 241 | $2.10B |
| Q3 2021 | 236 | $2.21B |
| Q2 2021 | 237 | $2.77B |
| Q1 2021 | 234 | $2.72B |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding Ati Inc; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Aquatic Capital Management LLC | 40,380 | $5.87M | 0.17% | +40,380 | New |
| Quantinno Capital Management LP | 40,458 | $5.89M | 0.01% | +7,495+22.7% | Added |
| Yousif Capital Management, LLC | 40,476 | $5.89M | 0.07% | −2,040−4.8% | Reduced |
| Quadrature Capital Ltd | 41,620 | $6.05M | 0.07% | +41,620 | New |
| Cerity Partners LLC | 41,648 | $6.06M | 0.01% | +7,665+22.6% | Added |
| Asset Management One Co.,Ltd. | 42,215 | $6.09M | 0.02% | −185−0.4% | Reduced |
| 1492 Capital Management LLC | 41,865 | $6.09M | 2.32% | −427−1.0% | Reduced |
| Qsemble Capital Management, LP | 42,008 | $6.11M | 0.47% | +33,921+419.5% | Added |
| Pathstone Holdings, LLC | 43,146 | $6.28M | 0.02% | −2,205−4.9% | Reduced |
| Horizon Investments, LLC | 43,214 | $6.29M | 0.07% | −12,300−22.2% | Reduced |
| RPg Family Wealth Advisory, LLC | 44,103 | $6.42M | 1.34% | +44,103 | New |
| Capital Group Private Client Services, Inc. | 44,349 | $6.45M | 0.11% | −19,018−30.0% | Reduced |
| TD Asset Management Inc | 45,569 | $6.63M | 0.01% | −2,212−4.6% | Reduced |
| Warren Averett Asset Management, LLC | 46,082 | $6.70M | 0.05% | −13,761−23.0% | Reduced |
| State of New Jersey Common Pension Fund D | 46,864 | $6.82M | 0.03% | 00.0% | Unchanged |
| Voya Investment Management LLC | 47,251 | $6.87M | 0.01% | +5,677+13.7% | Added |
| Jones Financial Companies LLLP | 49,713 | $6.98M | 0.00% | +34,094+218.3% | Added |
| Fifth Third Bancorp | 48,899 | $7.11M | 0.01% | +47,543+3,506.1% | Added |
| Nordea Investment Management AB | 50,456 | $7.17M | 0.01% | −2,244−4.3% | Reduced |
| Teachers Retirement System of the State of Kentucky | 50,246 | $7.31M | 0.06% | −12,446−19.9% | Reduced |
| Thrivent Financial for Lutherans | 50,399 | $7.33M | 0.01% | +3,112+6.6% | Added |
| Ieq Capital, LLC | 51,684 | $7.52M | 0.03% | −13,533−20.8% | Reduced |
| Mutual of America Capital Management LLC | 52,066 | $7.57M | 0.09% | −4,477−7.9% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 52,264 | $7.60M | 0.02% | +8,352+19.0% | Added |
| Soros Fund Management LLCSuperinvestorSoros Fund Management | 52,832 | $7.68M | 0.11% | +52,832 | New |
| S Squared Technology, LLC | 55,000 | $8.00M | 3.03% | −25,000−31.3% | Reduced |
| Vanguard Global Advisers, LLC | 55,668 | $8.10M | 0.00% | +55,668 | New |
| Empowered Funds, LLC | 55,970 | $8.14M | 0.05% | +42,136+304.6% | Added |
| State of Tennessee, Treasury Department | 56,903 | $8.28M | 0.03% | −3,612−6.0% | Reduced |
| Treasurer of the State of North Carolina | 57,670 | $8.39M | 0.03% | +1,227+2.2% | Added |
| Police & Firemen's Retirement System of New Jersey | 57,678 | $8.39M | 0.07% | +319+0.6% | Added |
| Worldquant Millennium Advisors LLC | 58,010 | $8.44M | 0.03% | −34,157−37.1% | Reduced |
| Intech Investment Management LLC | 59,394 | $8.64M | 0.08% | +54,356+1,078.9% | Added |
| Man Group plc | 59,535 | $8.66M | 0.02% | −72,126−54.8% | Reduced |
| Janus Henderson Group PLC | 60,508 | $8.80M | 0.00% | 00.0% | Unchanged |
| XTX Topco Ltd | 61,247 | $8.91M | 0.15% | +58,210+1,916.7% | Added |
| Amalgamated Bank | 62,536 | $9.10M | 0.07% | +1,182+1.9% | Added |
| Brevan Howard Capital Management LP | 62,710 | $9.12M | 0.09% | +54,307+646.3% | Added |
| New York State Common Retirement Fund | 63,437 | $9.23M | 0.01% | −1,500−2.3% | Reduced |
| Credit Agricole S A | 66,022 | $9.60M | 0.03% | +27,000+69.2% | Added |
| MetLife Investment Management | 66,816 | $9.72M | 0.05% | +447+0.7% | Added |
| Engineers Gate Manager LP | 68,945 | $10.0M | 0.13% | +31,519+84.2% | Added |
| Globeflex Capital L P | 69,161 | $10.1M | 1.52% | −2,920−4.1% | Reduced |
| Manufacturers Life Insurance Company, The | 69,568 | $10.1M | 0.01% | −24,167−25.8% | Reduced |
| Mengis Capital Management, Inc. | 70,652 | $10.3M | 1.77% | −2,615−3.6% | Reduced |
| Mariner, LLC | 72,487 | $10.5M | 0.01% | +18,396+34.0% | Added |
| Anomaly Capital Management, LP | 74,830 | $10.9M | 0.66% | +74,830 | New |
| Citigroup Inc | 75,616 | $11.0M | 0.01% | −18,317−19.5% | Reduced |
| Wellington Management Group LLP | 75,745 | $11.0M | 0.00% | −301,613−79.9% | Reduced |
| Channing Capital Management, LLC | 77,998 | $11.3M | 0.29% | −27,321−25.9% | Reduced |
| Great West Life Assurance Co | 78,513 | $11.4M | 0.02% | −963−1.2% | Reduced |
| Northwestern Mutual Wealth Management Co | 79,308 | $11.5M | 0.01% | +51,772+188.0% | Added |
| Rokos Capital Management LLP | 80,343 | $11.7M | 0.21% | +80,343 | New |
| Tema ETFs LLC | 81,261 | $11.8M | 0.79% | +3,144+4.0% | Added |
| Susquehanna Fundamental Investments, LLC | 82,786 | $12.0M | 0.45% | 00.0% | Unchanged |
| Epoch Investment Partners, Inc. | 85,601 | $12.5M | 0.08% | −4,698−5.2% | Reduced |
| Healthcare of Ontario Pension Plan Trust Fund | 87,042 | $12.7M | 0.02% | +33,580+62.8% | Added |
| ExodusPoint Capital Management, LP | 88,212 | $12.8M | 0.13% | +70,578+400.2% | Added |
| Tudor Investment Corp Et Al | 88,935 | $12.9M | 0.07% | +88,935 | New |
| Woodline Partners LP | 89,389 | $13.0M | 0.05% | −381,806−81.0% | Reduced |
| SEI Investments Co | 90,045 | $13.1M | 0.01% | −29,540−24.7% | Reduced |
| Tran Capital Management, L.P. | 90,862 | $13.2M | 1.81% | −261,460−74.2% | Reduced |
| Mountaineer Partners Management, LLC | 91,784 | $13.4M | 6.63% | −37,125−28.8% | Reduced |
| Stifel Financial Corp | 92,619 | $13.5M | 0.01% | −5,011−5.1% | Reduced |
| First Trust Advisors LP | 93,147 | $13.5M | 0.01% | +11,883+14.6% | Added |
| Emerald Mutual Fund Advisers Trust | 93,847 | $13.7M | 0.66% | −89,708−48.9% | Reduced |
| Royce & Associates LP | 98,112 | $14.3M | 0.14% | −33,420−25.4% | Reduced |
| State Board of Administration of Florida Retirement System | 98,530 | $14.3M | 0.03% | −1,670−1.7% | Reduced |
| Voleon Capital Management LP | 98,923 | $14.4M | 0.31% | +95,594+2,871.6% | Added |
| Barclays PLC | 99,328 | $14.4M | 0.01% | −40,216−28.8% | Reduced |
| Signature Estate & Investment Advisors LLC | 99,952 | $14.5M | 0.29% | −44,377−30.7% | Reduced |
| Advisors Asset Management, Inc. | 102,505 | $14.9M | 0.25% | +5,184+5.3% | Added |
| FACT Capital, LP | 103,102 | $15.0M | 9.97% | 00.0% | Unchanged |
| Toroso Investments, LLC | 103,666 | $15.1M | 0.05% | +84,639+444.8% | Added |
| Guggenheim Capital LLC | 104,361 | $15.2M | 0.12% | +17,956+20.8% | Added |
| Vanguard Asset Management, Ltd | 104,824 | $15.2M | 0.01% | +104,824 | New |
| CIBC Bancorp USA Inc. | 106,915 | $15.6M | 0.02% | +106,915 | New |
| Algert Global LLC | 107,254 | $15.6M | 0.23% | −20,691−16.2% | Reduced |
| Deutsche Bank AG | 107,889 | $15.7M | 0.01% | −3,237−2.9% | Reduced |
| Russell Investments Group, Ltd. | 109,249 | $15.9M | 0.02% | +79,230+263.9% | Added |
| Sanctuary Advisors, LLC | 115,616 | $16.8M | 0.09% | −19,649−14.5% | Reduced |
| Nomura Asset Management International Inc. | 117,121 | $17.0M | 0.03% | −122,488−51.1% | Reduced |
| Natixis Advisors, L.P. | 124,277 | $18.1M | 0.03% | −26,988−17.8% | Reduced |
| New York State Teachers Retirement System | 134,642 | $19.6M | 0.04% | −13,327−9.0% | Reduced |
| Senator Investment Group LP | 145,000 | $21.1M | 0.97% | −180,000−55.4% | Reduced |
| Walleye Capital LLC | 146,109 | $21.3M | 0.13% | +43,811+42.8% | Added |
| 1832 Asset Management L.P. | 151,514 | $22.0M | 0.03% | −142,959−48.5% | Reduced |
| California State Teachers Retirement System | 157,761 | $22.9M | 0.02% | +27,339+21.0% | Added |
| Panagora Asset Management Inc | 165,531 | $24.1M | 0.09% | +140,095+550.8% | Added |
| LPL Financial LLC | 165,570 | $24.1M | 0.01% | +98,944+148.5% | Added |
| Canada Pension Plan Investment Board | 167,726 | $24.4M | 0.02% | −77,800−31.7% | Reduced |
| Royal Bank of Canada | 171,029 | $24.9M | 0.00% | +94,793+124.3% | Added |
| Emerald Advisers, LLC | 181,485 | $26.4M | 0.84% | −126,067−41.0% | Reduced |
| Lord, Abbett & Co. LLC | 182,049 | $26.5M | 0.09% | −85,000−31.8% | Reduced |
| Aventail Capital Group, LP | 185,312 | $27.0M | 1.30% | +185,312 | New |
| Hawk Ridge Capital Management LP | 185,600 | $27.0M | 0.98% | −23,900−11.4% | Reduced |
| State of Wisconsin Investment Board | 201,963 | $29.4M | 0.07% | −26,812−11.7% | Reduced |
| Legal & General Group Plc | 211,998 | $30.8M | 0.01% | −12,791−5.7% | Reduced |
| Driehaus Capital Management LLC | 212,734 | $30.9M | 0.23% | −377−0.2% | Reduced |
| Envestnet Asset Management Inc | 215,778 | $31.4M | 0.01% | +152,461+240.8% | Added |