Asp IsotopesASPI
13F holders, Q1 2026 (March 31)177holders +4
34new positions
32sold out
3famous investors
$4.43avg. 13F price*
At the end of Q1 2026, 177 institutions reported holding Asp Isotopes Inc. (ASPI) in their 13F filings, up 4 from Q4 2025. 34 opened new positions and 32 sold out. The largest holders were BlackRock, Inc. ($36.8M), Encompass Capital Advisors LLC ($30.6M) and Vanguard Capital Management LLC ($22.4M). 3 famous investors held it, including Paul Tudor Jones (0.0% of Tudor Investment Corporation's portfolio), Ken Griffin (0.0% of Citadel Advisors's portfolio) and Cliff Asness (0.0% of AQR Capital Management's portfolio).
- Company
- Asp Isotopes Inc.
- CUSIP
- 00218A105
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 34 | $43.7M |
| Exits | 32 | $19.1M |
All 13F filers, Q4 2025 → Q1 2026: 15,606,175 shares bought and 10,891,975 shares sold, net +4,714,200 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 177 holders
| BlackRock, Inc. | 0.00% | Add +22.7% | 8,328,144 | $36.8M |
| Encompass Capital Advisors LLC | 1.25% | New | 6,912,054 | $30.6M |
| Vanguard Capital Management LLC | 0.00% | — | 5,060,464 | $22.4M |
| Rovida Investment Management Ltd | 2.27% | No change | 4,100,000 | $18.1M |
| UBS Group AG | 0.00% | Add +18.1% | 2,841,709 | $12.6M |
| Geode Capital Management, LLC | 0.00% | Add +14.9% | 2,740,464 | $12.1M |
| Alyeska Investment Group, L.P. | 0.03% | Reduce -45.0% | 2,692,166 | $11.9M |
| State Street Corp. | 0.00% | Add +25.9% | 2,322,159 | $10.3M |
| Exchange Traded Concepts, LLC | 0.07% | Add +55.9% | 2,183,554 | $9.7M |
| AWM Investment Company, Inc. | 1.04% | No change | 2,124,496 | $9.4M |
| Morgan Stanley | 0.00% | Reduce -7.8% | 1,576,413 | $7.0M |
| Susquehanna International Group, LLP | 0.01% | Reduce -30.3% | 1,057,340 | $4.7M |
| Barclays PLC | 0.00% | Add +99.9% | 1,012,956 | $4.5M |
| Vanguard Portfolio Management LLC | 0.00% | — | 977,170 | $4.3M |
| Diametric Capital, LP | 1.10% | Add +29.3% | 953,505 | $4.2M |
| Northern Trust Corp. | 0.00% | Add +25.7% | 937,523 | $4.1M |
| Charles Schwab Investment Management Inc. | 0.00% | Add +1.3% | 897,236 | $4.0M |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 0.00% | Reduce -6.0% | 887,245 | $3.9M |
| Citadel Advisors | 0.00% | Reduce -55.5% | 768,006 | $3.4M |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 753,316 | $3.3M |
| Jane Street Group, LLC | 0.00% | Reduce -56.9% | 684,479 | $3.0M |
| Philadelphia Financial Management of San Francisco, LLC | 0.92% | New | 648,341 | $2.9M |
| WIM INVESTMENT MANAGEMENT Ltd | 0.79% | No change | 601,400 | $2.7M |
| Group One Trading LLC | 0.09% | Add +34.0% | 595,625 | $2.6M |
| Sara-Bay Financial | 0.78% | New | 586,673 | $2.6M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -69.3% | 526,795 | $2.3M |
| Pacer Advisors, Inc. | 0.01% | Add +24.6% | 503,925 | $2.2M |
| Chicago Partners Investment Group LLC | 0.05% | New | 374,078 | $2.1M |
| Shay Capital LLC | 0.27% | Reduce -25.8% | 429,500 | $1.9M |
| Rathbones Group PLC | 0.01% | Reduce -3.3% | 386,566 | $1.7M |
| Saba Capital Management, L.P. | 0.05% | Add +0.3% | 357,625 | $1.6M |
| HITE Hedge Asset Management LLC | 0.08% | Reduce -27.5% | 326,227 | $1.4M |
| Caprock Group, LLC | 0.03% | Reduce -0.4% | 321,000 | $1.4M |
| Alight Capital Management LP | 0.39% | New | 300,000 | $1.3M |
| Yaupon Capital Management LP | 0.07% | New | 300,000 | $1.3M |
| Bank of New York Mellon Corp | 0.00% | Add +18.4% | 289,009 | $1.3M |
| IMC-Chicago, LLC | 0.02% | Reduce -8.8% | 268,469 | $1.2M |
| JPMorgan Chase & Co. | 0.00% | Add +40.6% | 273,462 | $1.2M |
| Burkehill Global Management, LP | 0.06% | No change | 250,000 | $1.1M |
| Bank of Montreal | 0.00% | Add +96.6% | 231,773 | $1.0M |
| Purewater Capital LLC | 0.90% | — | 211,851 | $936K |
| Swiss National Bank | 0.00% | No change | 210,100 | $929K |
| Nuveen, LLC | 0.00% | Add +13.5% | 207,442 | $917K |
| Arosa Capital Management LP | 0.58% | No change | 200,000 | $884K |
| Empowered Funds, LLC | 0.01% | Add +38.1% | 185,953 | $822K |
| Bank of America Corp. | 0.00% | Reduce -26.8% | 168,997 | $747K |
| SBI Securities Co., Ltd. | 0.02% | Add +8.2% | 164,639 | $728K |
| Tudor Investment Corporation | 0.00% | Add +21.1% | 161,030 | $712K |
| Prelude Capital Management, LLC | 0.05% | Reduce -32.8% | 153,650 | $679K |
| PFG Investments, LLC | 0.03% | Reduce -16.2% | 152,300 | $673K |
| Sei Investments Co. | 0.00% | Add +93.0% | 148,648 | $657K |
| Massar Capital Management, LP | 0.13% | No change | 147,376 | $651K |
| Russell Investments Group, Ltd. | 0.00% | Add +0.1% | 145,627 | $644K |
| Farther Finance Advisors, LLC | 0.01% | Add +20.6% | 150,216 | $617K |
| Polen Capital Management LLC | 0.00% | Reduce -11.9% | 122,970 | $544K |
| Stifel Financial Corp. | 0.00% | Add +9.7% | 120,525 | $533K |
| Rhumbline Advisers | 0.00% | Add +15.9% | 117,678 | $520K |
| Cetera Investment Advisers | 0.00% | Add +61.0% | 114,817 | $507K |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Add +9.9% | 112,476 | $497K |
| Belpointe Asset Management LLC | 0.02% | New | 101,562 | $449K |
| Canal Insurance CO | 0.10% | No change | 100,000 | $442K |
| SG Americas Securities, LLC | 0.00% | New | 97,985 | $433K |
| Deutsche Bank AG | 0.00% | Add +36.5% | 93,658 | $414K |
| Marex Group Ltd | 0.00% | Add +7.6% | 91,700 | $405K |
| Pekin Hardy Strauss, Inc. | 0.04% | Add +231.3% | 88,450 | $391K |
| FNY Investment Advisers, LLC | 0.17% | Add +1.8% | 86,600 | $382K |
| National Bank of Canada | 0.00% | Add +38.0% | 86,120 | $380K |
| T. Rowe Price Associates Inc. | 0.00% | Add +64.4% | 80,641 | $357K |
| PEAK6 LLC | 0.01% | Add +753.6% | 79,212 | $350K |
| Penn Capital Management Company, LLC | 0.03% | Reduce -37.9% | 78,822 | $348K |
| California State Teachers Retirement System | 0.00% | Add +1.3% | 78,212 | $346K |
| Balyasny Asset Management L.P. | 0.00% | Reduce -5.0% | 76,521 | $338K |
| Headlands Technologies LLC | 0.04% | New | 75,166 | $332K |
| Citigroup Inc. | 0.00% | Reduce -0.3% | 75,162 | $332K |
| VANGUARD ASSET MANAGEMENT, Ltd | 0.00% | — | 74,308 | $328K |
| Squarepoint Ops LLC | 0.00% | Add +156.9% | 70,597 | $312K |
| MetLife Investment Management, LLC | 0.00% | Add +20.8% | 63,587 | $281K |
| Simplex Trading, LLC | 0.01% | Reduce -34.2% | 61,648 | $272K |
| DNB Asset Management AS | 0.00% | New | 59,782 | $264K |
| Invesco Ltd. | 0.00% | Reduce -4.9% | 56,634 | $250K |
| Legal & General Group Plc | 0.00% | Reduce -27.6% | 55,426 | $245K |
| Osaic Holdings, Inc. | 0.00% | Add +6.5% | 53,972 | $239K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Add +24.2% | 53,332 | $236K |
| Virtu Financial LLC | 0.01% | New | 50,461 | $223K |
| MH & Associates Securities Management Corp. | 0.19% | Add +2.9% | 50,096 | $221K |
| Wells Fargo & Company | 0.00% | Reduce -62.2% | 49,733 | $220K |
| Alliancebernstein L.P. | 0.00% | New | 38,760 | $207K |
| Patriot Financial Group Insurance Agency, LLC | 0.01% | Add +106.1% | 44,980 | $199K |
| LPL Financial LLC | 0.00% | Reduce -7.2% | 44,169 | $195K |
| Vanguard Global Advisers, LLC | 0.00% | — | 43,019 | $190K |
| Creative Planning | 0.00% | Add +298.7% | 41,580 | $184K |
| Allegheny Financial Group | 0.02% | Add +17.9% | 40,649 | $180K |
| Advisory Services Network, LLC | 0.00% | Add +17.1% | 40,248 | $178K |
| Scientech Research LLC | 0.15% | Add +114.3% | 40,230 | $178K |
| Janus Henderson Group PLC | 0.00% | No change | 39,000 | $172K |
| Royal Bank of Canada | 0.00% | Add +18.4% | 37,954 | $167K |
| Centiva Capital, LP | 0.01% | Add +34.4% | 36,544 | $162K |
| Police & Firemen's Retirement System of New Jersey | 0.00% | Add +63.2% | 33,888 | $150K |
| Quantinno Capital Management LP | 0.00% | Reduce -41.8% | 33,067 | $146K |
| KLP Kapitalforvaltning As | 0.00% | Add +89.2% | 31,600 | $140K |
"% of holder's portfolio" is ASPI's weight in each manager's 13F, not the share of Asp Isotopes Inc. the manager owns.