ASP Isotopes (ASPI): which funds own it
A 13F shows the portfolio at quarter-end and is filed up to 45 days later: these are not real-time positions and they may have changed.
Sections with a free account
2 concentrated managers hold it with a median weight of 0.6%. 1 officer or director bought in 6 months.
Who owns ASP Isotopes?
Holders reporting more than 5% of the shares to the SEC (Schedules 13D/13G): Mann Paul Elliot, 7.0% (13G/A filed Feb 17, 2026), BlackRock, 6.6% (13G/A filed Apr 27, 2026), AWM Investment, 5.8% (13G/A filed Feb 13, 2026), AK Jensen Investment Management, 5.4% (13G/A filed Nov 14, 2025) and Encompass Capital Advisors, 5.1% (13G filed Jan 23, 2026). As of Jun 30, 2026, the largest holders reported on Form 13F were BlackRock (7.3% of the shares), Encompass Capital Advisors (5.2%) and Vanguard Capital Management (4.0%).
Which institutions hold the most ASP Isotopes shares?
Per Form 13F filings as of Jun 30, 2026, as a share of all shares outstanding:
- 1. BlackRock: 7.3%
- 2. Encompass Capital Advisors: 5.2%
- 3. Vanguard Capital Management: 4.0%
- 4. Rovida Investment Management: 3.3%
- 5. UBS Group: 2.6%
- 6. Geode Capital Management: 2.3%
- 7. Alyeska Investment Group: 2.3%
- 8. State Street: 2.1%
- 9. Exchange Traded Concepts: 1.8%
- 10. AWM Investment: 1.3%
How much of ASP Isotopes do institutions own?
The 187 institutions that file 13F reported 51.8% of the shares as of Jun 30, 2026 (not counting 1 position with implausible figures).
Sources:13G/A by Mann Paul Elliot (Feb 17, 2026) ↗13G/A by BlackRock (Apr 27, 2026) ↗13G/A by AWM Investment (Feb 13, 2026) ↗13G/A by AK Jensen Investment Management (Nov 14, 2025) ↗13G by Encompass Capital Advisors (Jan 23, 2026) ↗All of the company's proxy statements on EDGAR ↗
13F percentages divide the shares each institution reports by the shares outstanding on the cover of the company's latest report before the quarter end (May 20, 2026). Entities of the same group file separately and are not added up. We hold 13D and 13G filings made since Dec 23, 2024: a holder above 5% that has not filed since then does not appear here.
ASP Isotopes revenue
ASP Isotopes reported annual revenue of $23.8 million for fiscal year 2025 (year ended December 31, 2025), according to its Form 10-K filed with the SEC (XBRL data).
Quarter flow (concentrated managers)
Change in managers (2 → 2): 1 opened · 1 exited = 0
Net flow in the quarter: −$3.9M (−634 K shares) · bought $77K and sold $4.0MShares concentrated managers added minus those they cut, valued at the 13F quarter-end implied price, not each trade's price. It is a different measure from the change in managers: the two can have opposite signs.
Concentrated managers holding it
- WIM Investment ManagementReduced$3.4M1.1%−0.1 pp
- Silverberg Bernstein Capital ManagementNew$77.4K0.0%+0.0 pp
Up to 15, sorted by position value. The percentage is the weight in each manager's portfolio.
Largest holders of ASPI (all 13F filers)
- BlackRock9.2 MIndex manager · 6.01% of the company+889 K
- Encompass Capital Advisors6.6 MInvestment firm · 4.28% of the company−350 K
- Vanguard Capital Management5.0 MIndex manager · 3.25% of the company−78 K
- Rovida Investment Management4.1 MType not verified · 2.67% of the company0
- UBS Group3.2 MBank or trading desk · 2.12% of the company+406 K
- Geode Capital Management2.9 MIndex manager · 1.92% of the company+205 K
- Alyeska Investment Group2.8 MInvestment firm · 1.85% of the company+151 K
- State Street2.6 MIndex manager · 1.69% of the company+273 K
- Exchange Traded Concepts2.3 MType not verified · 1.47% of the company+72 K
- AWM Investment1.6 MType not verified · 1.03% of the company−543 K
- Shares
- 9.2 M
- Change
- +889 K
- % of the company
- 6.01%
See more
- Type
- Index manager
- Value
- $57.3M
- Shares
- 6.6 M
- Change
- −350 K
- % of the company
- 4.28%
See more
- Type
- Investment firm
- Value
- $40.8M
- Shares
- 5.0 M
- Change
- −78 K
- % of the company
- 3.25%
See more
- Type
- Index manager
- Value
- $31.0M
- Shares
- 4.1 M
- Change
- 0
- % of the company
- 2.67%
See more
- Type
- Type not verified
- Value
- $25.5M
- Shares
- 3.2 M
- Change
- +406 K
- % of the company
- 2.12%
See more
- Type
- Bank or trading desk
- Value
- $20.2M
- Shares
- 2.9 M
- Change
- +205 K
- % of the company
- 1.92%
See more
- Type
- Index manager
- Value
- $18.3M
- Shares
- 2.8 M
- Change
- +151 K
- % of the company
- 1.85%
See more
- Type
- Investment firm
- Value
- $17.7M
- Shares
- 2.6 M
- Change
- +273 K
- % of the company
- 1.69%
See more
- Type
- Index manager
- Value
- $16.1M
- Shares
- 2.3 M
- Change
- +72 K
- % of the company
- 1.47%
See more
- Type
- Type not verified
- Value
- $14.0M
- Shares
- 1.6 M
- Change
- −543 K
- % of the company
- 1.03%
See more
- Type
- Type not verified
- Value
- $9.8M
The 10 13F filers with the most shares as of Jun 30, 2026, whatever their type (index firms usually come first). “Change”: shares added or cut versus the previous quarter, split-adjusted; “no data” = there is no comparable portfolio for the previous quarter (no filing, or a filing with its holdings under confidential treatment). “% of the company” only where shares outstanding are up to date. Entities of the same group file separately and some 13F filings include other managers: there may be double counting. With a free account: the top 25, the largest buyers and the largest sellers.
Held by institutions (13F)
Institutions (13F): 51.8% of the shares · top 10: 32.0% · in index firms: 38.0% of the institutional total
Q2 2026: 51.8%
Shares reported by the 187 13F filers as of Jun 30, 2026 (not counting 1 position with implausible figures), divided by the shares outstanding on the cover of the company's latest report (May 20, 2026). It is not all institutional ownership: only managers above $100M file a 13F, and it excludes short positions. Entities of the same group file separately and some 13F filings include other managers: there may be double counting. We only publish it where the figure is credible: not for ADRs, companies with more than one share class or stale shares-outstanding data.
Fundamentals
12-month figures to Jun 30, 2026 · balance sheet as of Jun 30, 2026.
- Operating margin
- —
- Net margin
- —
- ROE
- -44.3%
- Revenue (TTM)
- $30.9M
- Revenue growth
- 573.4%
- Net income (TTM)
- $-117M
- Net debt / EBITDA
- —
- Free cash flow (TTM)
- $-83.6M
- Quality vs sector
- —
This company's sector comes from its SIC code, unreviewed, or has too few comparable companies: we do not compare it with its sector.
Figures from the statements the company filed with the SEC (10-K, 10-Q). Free cash flow = operating cash flow − capital expenditures; empty if the company does not report capex. “Quality vs sector”: 0 to 100, the average of its percentiles in ROE, operating margin, free-cash-flow margin, revenue and earnings growth and net debt / EBITDA (at least 3 needed) against companies in its sector above $300M. How each figure is calculated
Shares outstanding: buybacks and dilution
2025: 83.0 M
- 1 year
- +49.1%
- 3 years
- +209.8%
- 5 years
- no data
- Buybacks (FY 2025)
- no data
- Share issuance
- $320M
- Stock-based compensation
- $16.0M67.2% of revenue
- Dividends paid
- $0
From the statements the company filed with the SEC (10-K). The change compares average diluted shares of each fiscal year, on today's basis: negative = it bought back more than it issued; positive = dilution. “No data” = the company does not report that item under a tag we can read; it does not mean zero.
Earnings quality and debt
- Operating cash flow ÷ net income (12 months)
- no datanot calculated with negative net income
- Interest coverage (operating income ÷ interest)
- −104 timesnegative operating income
- Debt due within 12 months
- $54.7M0.21 times cash and investments
- Year 1$607K
- Year 2$638K
- Year 3$455K
- Year 4$46.0K
- Year 5—
- Later—
From the figures the company filed with the SEC. Cash flow over net income near or above 1 means earnings are collected in cash; far below, that part is accounting. Coverage says how many times operating income pays the latest fiscal year's interest. Maturities come from the debt note of the latest annual report, counted from its closing date. “No data” never means zero.
Insiders (Form 4)
10% owners who bought (6 m): 0
Open-market purchases, excluding 10b5-1 plans. Officers and directors only; joint filers of the same purchase count as one. 10% owners with no role are shown separately. 0 = nobody bought; “no data” = we do not have its Form 4 filings.
Each of the company's Form 4 filings, on EDGAR ↗Latest trades, with date and filing →
Above 5% (13D/13G)
Disclosed stakes, with their amendments. A filing is not always a purchase: there are also reductions and changes of filing entity.
This list may be incomplete: we hold 13D and 13G filings made since Dec 23, 2024. A holder above 5% that has not filed anything since then is not shown here.
- BlackRock6.6%13G · amendmentfiling ↗Event: Mar 31, 2026 · filed: Apr 27, 2026
- Vanguard Groupchange of filing entity13G · amendmentfiling ↗Event: Mar 13, 2026 · filed: Mar 26, 2026
- Mann Paul Elliot7%13G · amendmentfiling ↗Event: Dec 31, 2025 · filed: Feb 17, 2026
Above 5% over time (13D/13G)
Each holder with its filings in order. History since December 2024.
Flagged material events (8-K)
Unregistered sale of equity securities (Item 3.02)
«ASP Isotopes Announces Agreements to Exchange Certain»
Unregistered sale of equity securities (Item 3.02)
«Amended and Restated»
Change in directors or officers (Item 5.02)
Unregistered sale of equity securities (Item 3.02)
«ASP Isotopes Closes Acquisition of Renergen»
Change in directors or officers (Item 5.02)
Unregistered sale of equity securities (Item 3.02)
Alert items the company itself flagged in its 8-K filings with the SEC, most serious first. It is the form's label, with no interpretation from us: Item 5.02 covers routine appointments as well as a chief executive's departure; open the filing. The quoted headline is the original press release's.
All material events (8-K)
Earnings, agreements, financing, management changes and announcements from the last year, with a filter by type and a link to each filing.
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