ASPI · Insider trading · 13F holders · Congress trades
ASP Isotopes Inc. (ASPI)
Who is buying and selling ASPI: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 7
- Insider buys, 90 days
- $62K
- Insider sales, 90 days
- $1.3M
- Congress trades, 12 months
- 0
ASPI at a glance
- Between Aug 1, 2026 and Oct 29, 2026, 5 ASPI insiders filed 2 open-market purchases worth $62K and 6 sales worth $1.3M on SEC Form 4; 4 of the sales were pre-planned under Rule 10b5-1.
- 7 13F filers hold ASPI among their 50 largest positions, worth $91.6M combined. The biggest bets by portfolio weight are Philadelphia Financial Management of San Francisco, LLC (2.3%), Encompass Capital Advisors LLC (1.8%) and Rovida Investment Management Ltd (1.7%). In their latest 13Fs, 0 managers opened a new position and 2 added to one.
- No member of Congress has disclosed a trade in ASPI.
- ASPI last closed at $2.13 on Oct 29, 2026.
ASPI insider trading
Between Aug 1, 2026 and Oct 29, 2026, 5 ASPI insiders filed 2 open-market purchases worth $62K and 6 sales worth $1.3M on SEC Form 4; 4 of the sales were pre-planned under Rule 10b5-1.
| Filed | Insider | Role | Trade | Shares | Price | Value | Form 4 |
|---|---|---|---|---|---|---|---|
| Oct 21, 2026 | Kiessling Heather | Chief Financial Officer | Sale | 21,830 | $2.19 | $48K | SEC |
| Oct 16, 2026 | Ainscow Robert | COO | Sale10b5-1 | 22,500 | $2.11 | $48K | SEC |
| Oct 1, 2026 | Ryan Robert John Andrew | Director | Buy | 15,000 | $2.68 | $40K | SEC |
| Sep 30, 2026 | Ryan Robert John Andrew | Director | Buy | 8,000 | $2.70 | $22K | SEC |
| Sep 10, 2026 | Ainscow Robert | COO | Sale10b5-1 | 8,438 | $4.29 | $36K | SEC |
| Sep 4, 2026 | Mann Paul Elliot | Chairman and CEO, Director | Sale10b5-1 | 251,275 | $3.98 | $999K | SEC |
| Sep 4, 2026 | Ainscow Robert | COO | Sale10b5-1 | 25,000 | $3.91 | $98K | SEC |
| Sep 4, 2026 | Ainscow Donald George | EVP, Gen Counsel, Secretary | Sale | 23,678 | $3.89 | $92K | SEC |
Who owns ASPI? Hedge funds and superinvestors
7 13F filers hold ASPI among their 50 largest positions, worth $91.6M combined. The biggest bets by portfolio weight are Philadelphia Financial Management of San Francisco, LLC (2.3%), Encompass Capital Advisors LLC (1.8%) and Rovida Investment Management Ltd (1.7%). In their latest 13Fs, 0 managers opened a new position and 2 added to one.
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Encompass Capital Advisors LLCHedge fund | 1.8% | $40.8M | 6,561,754 | -5.1% shares | Q2 2026 |
| Rovida Investment Management LtdAsset manager | 1.7% | $25.5M | 4,100,000 | +0.0% shares | Q2 2026 |
| AWM Investment Company, Inc.Hedge fund | 0.9% | $9.8M | 1,581,490 | -25.6% shares | Q2 2026 |
| Philadelphia Financial Management of San Francisco, LLCHedge fund | 2.3% | $8.4M | 1,343,007 | +107.1% shares | Q2 2026 |
| WIM INVESTMENT MANAGEMENT LtdAsset manager | 1.1% | $3.4M | 541,400 | -10.0% shares | Q2 2026 |
| Diametric Capital, LPHedge fund | 0.4% | $3.3M | 538,517 | -43.5% shares | Q2 2026 |
| Mh & Associates Securities Management Corp /advBroker-dealer | 0.3% | $387K | 62,265 | +24.3% shares | Q2 2026 |
Each manager counts with its latest 13F (Q2 2026: 7). Screen ASPI in the grand portfolio →
ASPI stock trades by members of Congress
No member of Congress has disclosed a trade in ASPI.
ASPI questions and answers
Are insiders buying ASPI stock?
Between Aug 1, 2026 and Oct 29, 2026, 5 ASPI insiders filed 2 open-market purchases worth $62K and 6 sales worth $1.3M on SEC Form 4; 4 of the sales were pre-planned under Rule 10b5-1.
Which hedge funds own ASPI?
7 13F filers hold ASPI among their 50 largest positions, worth $91.6M combined. The biggest bets by portfolio weight are Philadelphia Financial Management of San Francisco, LLC (2.3%), Encompass Capital Advisors LLC (1.8%) and Rovida Investment Management Ltd (1.7%). In their latest 13Fs, 0 managers opened a new position and 2 added to one.
Has Congress traded ASPI?
No member of Congress has disclosed a trade in ASPI.
Who is the largest holder of ASPI?
Among 13F filers, Encompass Capital Advisors LLC reports the largest ASPI position, $40.8M (6,561,754 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Philadelphia Financial Management of San Francisco, LLC's: 2.3% of its portfolio.
Cite or share this
Free to use with a link back. The data updates every filing day.