Latest Period
Q1 2026
Security Snapshot
ASP Isotopes Inc. - Common Stock (ASPI) Institutional Ownership
CUSIP: 00218A105
13F Institutional Holders and Ownership History from Q4 2022 to Q1 2026
Institutions Reporting
176
Shares (Excl. Options)
63,337,361
Price
$4.42
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- Security type / class
- Equity / Common Stock
- Symbol
- ASPI on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 63,337,361
- Total 13F value
- $280,283,793
- Portfolio coverage rank
- 0%
- Share change
- +4,114,421
- Value change
- +$14,855,631
- Number of holders
- 176
- Shares outstanding
- 125,375,197
- SEC-reported price per share
- $6.32
- Insider filing price
- $6.32
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- ASPI - ASP Isotopes Inc. - Common Stock is tracked under CUSIP 00218A105.
- 176 institutions reported positions in Q1 2026.
- 6 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 174 to 176 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $313,430,601 to $280,283,793.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 176 institutions filings for Q1 2026.
Security key
00218A105
Latest holder period
Q1 2026
13F holders
176
13D/G owners
6
CIK / CUSIP context first
Open Q1 2026 holders
ASPI full holder history
ASP Isotopes Inc. SEC filings
ASP Isotopes Inc. company facts
ASP Isotopes Inc. insider transactions
ASP Isotopes Inc. 13D/G history
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 00218A105:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
6
Security
ASPI
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 6.6% | +18% | $36,574,452 | +$19,091,638 | 8,274,763 | +109% | BlackRock, Inc. | 31 Mar 2026 |
| Mann Paul Elliot | 7% | -35% | $58,118,940 | +$348,704 | 7,759,538 | +0.6% | Mann Paul Elliot | 31 Dec 2025 |
| Encompass Capital Advisors LLC | 5.1% | $34,311,487 | 6,413,362 | Encompass Capital Advisors LLC | 16 Jan 2026 | |||
| AK Jensen Investment Management Ltd | 5.4% | -17% | $47,669,611 | +$2,373,350 | 4,955,261 | +5.2% | AK Jensen Investment Management Ltd | 30 Sep 2025 |
| BNP Paribas Asset Management UK Ltd | 0.9% | -84% | $7,073,002 | -$20,102,329 | 944,326 | -74% | BNP Paribas Asset Management UK Ltd | 31 Dec 2025 |
| AWM Investment Company, Inc. | 5.8% | -16% | $4,640,609 | -$2,247 | 619,574 | -0.05% | AWM Investment Company, Inc. | 31 Dec 2025 |
As of 31 Mar 2026, 176 institutional investors reported holding 63,337,361 shares of ASP Isotopes Inc. - Common Stock (ASPI). This represents 51% of the company’s total 125,375,197 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
42%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 6.6% | 8,328,144 | +23% | 0% | $36,810,397 |
| Encompass Capital Advisors LLC | 5.5% | 6,912,054 | 1.2% | $30,551,279 | |
| VANGUARD CAPITAL MANAGEMENT LLC | 4% | 5,060,464 | 0% | 0% | $22,367,251 |
| Rovida Investment Management Ltd | 3.3% | 4,100,000 | 0% | 2.3% | $18,081,000 |
| UBS Group AG | 2.3% | 2,841,709 | +18% | 0% | $12,560,354 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.2% | 2,740,464 | +15% | 0% | $12,115,932 |
| Alyeska Investment Group, L.P. | 2.1% | 2,692,166 | -45% | 0.03% | $11,899,374 |
| STATE STREET CORP | 1.9% | 2,322,159 | +26% | 0% | $10,263,943 |
| EXCHANGE TRADED CONCEPTS, LLC | 1.7% | 2,183,554 | +56% | 0.07% | $9,651,309 |
| AWM Investment Company, Inc. | 1.7% | 2,124,496 | 0% | 1% | $9,390,272 |
| MORGAN STANLEY | 1.3% | 1,576,413 | -7.8% | 0% | $6,967,746 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 0.84% | 1,057,340 | -30% | 0.01% | $4,673,442 |
| BARCLAYS PLC | 0.81% | 1,012,956 | +100% | 0% | $4,477,265 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 0.78% | 977,170 | 0% | 0% | $4,319,091 |
| Diametric Capital, LP | 0.76% | 953,505 | +29% | 1.1% | $4,214,492 |
| NORTHERN TRUST CORP | 0.75% | 937,523 | +26% | 0% | $4,143,852 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.72% | 897,236 | +1.3% | 0% | $3,965,783 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 0.71% | 887,245 | -6% | 0% | $3,921,623 |
| CITADEL ADVISORS LLC | 0.61% | 768,006 | -55% | 0% | $3,394,586 |
| VANGUARD FIDUCIARY TRUST CO | 0.6% | 753,316 | 0% | 0% | $3,329,657 |
| JANE STREET GROUP, LLC | 0.55% | 684,479 | -57% | 0% | $3,025,397 |
| Philadelphia Financial Management of San Francisco, LLC | 0.52% | 648,341 | 0.92% | $2,865,667 | |
| WIM INVESTMENT MANAGEMENT Ltd | 0.48% | 601,400 | 0% | 0.79% | $2,658,188 |
| GROUP ONE TRADING LLC | 0.48% | 595,625 | +34% | 0.09% | $2,632,662 |
| Sara-Bay Financial | 0.47% | 586,673 | 0.8% | $2,593,095 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
14
Latest
Q1 2026
Rows shown
1-14 of 14
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 63,337,361 | $280,283,793 | +$14,855,631 | $4.42 | 176 |
| 2025 Q4 | 58,592,821 | $313,430,601 | -$11,748,778 | $5.35 | 174 |
| 2025 Q3 | 52,913,307 | $508,847,148 | +$110,653,479 | $9.62 | 157 |
| 2025 Q2 | 41,457,954 | $305,098,103 | +$67,158,257 | $7.36 | 128 |
| 2025 Q1 | 32,449,321 | $152,180,878 | +$1,683,981 | $4.69 | 95 |
| 2024 Q4 | 32,368,343 | $146,626,225 | +$46,429,858 | $4.53 | 90 |
| 2024 Q3 | 22,358,987 | $62,155,606 | +$36,093,163 | $2.78 | 65 |
| 2024 Q2 | 8,782,584 | $26,865,000 | +$14,523,618 | $3.06 | 50 |
| 2024 Q1 | 3,770,857 | $15,573,438 | +$9,482,875 | $4.13 | 30 |
| 2023 Q4 | 1,674,490 | $3,011,098 | +$2,345,436 | $1.79 | 19 |
| 2023 Q3 | 308,068 | $292,885 | -$942,408 | $0.95 | 11 |
| 2023 Q2 | 551,482 | $1,024,133 | -$1,744,788 | $0.57 | 4 |
| 2023 Q1 | 3,248,596 | $2,772,962 | +$2,733,353 | $0.85 | 6 |
| 2022 Q4 | 47,212 | $75,285 | +$75,285 | $1.58 | 3 |