Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in ASPI held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 8.3M | $36.8M | +22.7% | 10.022% | 0.00% |
| 2 | Encompass Capital Advisors LLC | 6.9M | $30.6M | β | 8.318% | 1.25% |
| 3 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 5.3M | $23.6M | +2.2% | 6.418% | 0.00% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 5.1M | $22.4M | β | 6.090% | 0.00% |
| 5 | Rovida Investment Management Ltd | 4.1M | $18.1M | 0.0% | 4.934% | 2.27% |
| 6 | UBS Group AG | 3.0M | $13.2M | +24.3% | 3.600% | 0.00% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 2.7M | $12.1M | +14.9% | 3.298% | 0.00% |
| 8 | Alyeska Investment Group, L.P. | 2.7M | $11.9M | -45.0% | 3.240% | 0.03% |
| 9 | CITADEL ADVISORS LLC | 2.6M | $11.7M | β | 3.179% | 0.01% |
| 10 | STATE STREET CORP | 2.3M | $10.3M | +25.9% | 2.795% | 0.00% |
| 11 | EXCHANGE TRADED CONCEPTS, LLC | 2.2M | $9.7M | +55.9% | 2.628% | 0.07% |
| 12 | AWM Investment Company, Inc. | 2.1M | $9.4M | 0.0% | 2.557% | 1.04% |
| 13 | MORGAN STANLEY | 1.6M | $7.0M | -7.8% | 1.897% | 0.00% |
| 14 | BARCLAYS PLC | 1.0M | $4.5M | +66.9% | 1.219% | 0.00% |
| 15 | VANGUARD PORTFOLIO MANAGEMENT LLC | 977K | $4.3M | β | 1.176% | 0.00% |
| 16 | Diametric Capital, LP | 954K | $4.2M | +29.3% | 1.148% | 1.10% |
| 17 | NORTHERN TRUST CORP | 938K | $4.1M | +25.7% | 1.128% | 0.00% |
| 18 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 897K | $4.0M | +1.3% | 1.080% | 0.00% |
| 19 | BNP Paribas Asset Management Holding S.A. | 887K | $3.9M | -6.0% | 1.068% | 0.00% |
| 20 | VANGUARD FIDUCIARY TRUST CO | 753K | $3.3M | β | 0.906% | 0.00% |
| 21 | Philadelphia Financial Management of San Francisco, LLC | 648K | $2.9M | β | 0.780% | 0.92% |
| 22 | WIM INVESTMENT MANAGEMENT Ltd | 601K | $2.7M | 0.0% | 0.724% | 0.79% |
| 23 | GROUP ONE TRADING, L.P. | 596K | $2.6M | +34.1% | 0.717% | 0.09% |
| 24 | Sara-Bay Financial | 587K | $2.6M | β | 0.706% | 0.78% |
| 25 | GOLDMAN SACHS GROUP INC | 552K | $2.4M | -68.0% | 0.664% | 0.00% |
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 ASPI β a direct measure of their conviction.
Filings activity in ASPI during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new ASPI position in Q1 2026
Institutions that fully closed their ASPI position in Q1 2026
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 |
|---|---|---|---|---|---|---|
| Q1 2026 | 172 | +1.8% | 55.50% | 3.15 pp | $302M | 5.4% |
| Q4 2025 | 169 | +10% | 58.65% | 42.76 pp | $319M | 42% |
| Q3 2025 | 153 | +21% | 101.41% | +42.46 pp | $552M | +72% |
| Q2 2025 | 126 | +33% | 58.95% | +33.60 pp | $321M | +133% |
| Q1 2025 | 95 | +2.2% | 25.35% | +2.19 pp | $138M | +9.4% |
| Q4 2024 | 93 | +37% | 23.16% | +13.31 pp | $126M | +135% |
| Q3 2024 | 68 | +33% | 9.85% | +5.21 pp | $54M | +112% |
| Q2 2024 | 51 | β | 4.64% | β | $25M | 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 ASPI stock.
Based on Q1 2026 13F filings, institutional ownership of ASP Isotopes Inc. Common Stock stands at 55.5%, held across 172 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of ASPI, with approximately 8,328,144 shares worth $0.04B as of Q1 2026.
Yes β 2 widely-followed marquee investors appear among the top 25 institutional holders of ASPI, including SUSQUEHANNA INTERNATIONAL GROUP, LLP, CITADEL ADVISORS LLC.
Our composite Smart Money Score for ASPI is 46 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
44 institutions opened new positions in ASPI during Q1 2026, while 41 fully exited. 46 added to existing positions and 82 trimmed.
ASPI institutional ownership fell by 3.15 percentage points quarter-over-quarter, with a net change of +3 holders.
The top 10 institutions account for 63.1% of all reported 13F value in ASPI, and the top 25 account for 85.5%.
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.
ASP Isotopes Inc. Common Stock (ASPI) Institutional Ownership