Latest Period
Q4 2025
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
174
Shares (Excl. Options)
58,592,821
Price
$5.35
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- Type / Class
- Equity / Common Stock
- Symbol
- ASPI on Nasdaq
- Shares outstanding
- 125,375,197
- Price per share
- $5.06
- All holders as of 31 Dec 2025
- Q4 2025
- Total 13F shares
- 58,592,821
- Total reported value
- $313,430,601
- % of total 13F portfolios
- 0%
- Share change
- +5,450,626
- Value change
- -$11,748,778
- Number of holders
- 174
- Price from insider filings
- $5.06
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- ASPI - ASP Isotopes Inc. - Common Stock is tracked under CUSIP 00218A105.
- 174 institutions reported positions in Q4 2025.
- 6 significant owners is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 174 to 125 between Q4 2025 and Q1 2026.
- Reported value moved from $313,430,601 to $151,615,556.
Why This Matters
- 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.
Source Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 174 institutions filings for Q4 2025.
Investment Quick Answers
What is CUSIP 00218A105?
CUSIP 00218A105 identifies ASPI - ASP Isotopes Inc. - Common Stock in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 00218A105:
Significant Owners of ASP Isotopes Inc. - Common Stock (ASPI) based on Schedule 13D/G filings
| 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 Dec 2025, 174 institutional investors reported holding 58,592,821 shares of ASP Isotopes Inc. - Common Stock (ASPI). This represents 47% of the company’s total 125,375,197 outstanding shares.
Top 25 Institutional Shareholders
The largest institutional shareholders of ASP Isotopes Inc. - Common Stock (ASPI) together control 38% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 5.4% | 6,789,417 | +24% | 0% | $36,323,380 |
| VANGUARD GROUP INC | 5.1% | 6,406,244 | +42% | 0% | $34,273,406 |
| Alyeska Investment Group, L.P. | 3.9% | 4,895,546 | +73% | 0.07% | $26,191,171 |
| Rovida Investment Management Ltd | 3.3% | 4,100,000 | +28% | 3% | $21,894,000 |
| UBS Group AG | 1.9% | 2,406,457 | +150% | 0% | $12,874,546 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.9% | 2,384,066 | +28% | 0% | $12,757,945 |
| AWM Investment Company, Inc. | 1.7% | 2,124,496 | -28% | 1.1% | $11,366,054 |
| STATE STREET CORP | 1.5% | 1,844,405 | +31% | 0% | $9,867,567 |
| CITADEL ADVISORS LLC | 1.4% | 1,725,553 | +48% | 0.01% | $9,231,709 |
| GOLDMAN SACHS GROUP INC | 1.4% | 1,715,292 | +320% | 0% | $9,176,813 |
| MORGAN STANLEY | 1.4% | 1,709,783 | +289% | 0% | $9,147,339 |
| JANE STREET GROUP, LLC | 1.3% | 1,586,961 | +30% | 0.01% | $8,490,241 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 1.2% | 1,516,643 | +13% | 0.01% | $8,114,040 |
| EXCHANGE TRADED CONCEPTS, LLC | 1.1% | 1,400,314 | +16% | 0.06% | $7,491,680 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 0.75% | 944,326 | +42% | 0.01% | $5,052,000 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.71% | 885,739 | +34% | 0% | $4,738,704 |
| Telemark Asset Management, LLC | 0.66% | 825,000 | -38% | 0.44% | $4,413,750 |
| MARSHALL WACE, LLP | 0.65% | 818,129 | -36% | 0% | $4,376,991 |
| NORTHERN TRUST CORP | 0.59% | 745,909 | +24% | 0% | $3,990,614 |
| Diametric Capital, LP | 0.59% | 737,304 | +107% | 1.1% | $3,944,576 |
| WIM INVESTMENT MANAGEMENT Ltd | 0.48% | 601,400 | 0.83% | $3,217,490 | |
| Shay Capital LLC | 0.46% | 579,000 | +291% | 0.5% | $3,097,650 |
| BARCLAYS PLC | 0.4% | 506,788 | +118% | 0% | $2,711,316 |
| HITE Hedge Asset Management LLC | 0.36% | 449,883 | 0.15% | $2,406,874 | |
| GROUP ONE TRADING LLC | 0.35% | 444,345 | -29% | 0.07% | $2,377,246 |
Institutional Holders of ASP Isotopes Inc. - Common Stock (ASPI) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 34,226,176 | $151,615,556 | +$6,831,979 | $4.42 | 125 |
| 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 |