ASP Isotopes Inc.
ASPI- Exchange
- Nasdaq
- Industry
- Miscellaneous Chemical Products
- SEC CIK
- 0001921865
In the last 90 days, ASP Isotopes Inc. insiders filed 0 open-market purchases and 8 sales; 185 institutions reported holding it in 13F filings for Q2 2026, worth $406.1M in total; no superinvestor holds it.
Holders of 5% or more of ASPI
Holders whose latest Schedule 13D or 13G filing reports 5% or more of ASP Isotopes Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Mann Paul Elliot | 13G/A | 10.80%7.71M shares | −1.10 ppfrom 11.90% | Feb 14, 20253 filings | Feb 18, 2025 | SEC |
| BlackRock, Inc. | 13G | 5.50%3.96M shares | New | Feb 4, 20251 filing | Feb 4, 2025 | SEC |
| AK Jensen Investment Management Ltd | 13G/A | 5.40%4.96M shares | −1.20 ppfrom 6.60% | Feb 12, 20252 filings | Nov 14, 2025 | SEC |
| BNP Paribas Asset Management UK Ltd | 13G | 5.10%3.63M shares | New | Apr 11, 20251 filing | Apr 11, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
9 Schedule 13D and 13G filings on ASP Isotopes Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Nov 14, 20259:03 AM ET | AK Jensen Investment Management Ltd | 13G/A | 5.40%4.96M shares | −1.20 ppfrom 6.60% | Sep 30, 2025 | SEC |
| Aug 14, 20252:28 PM ET | AWM Investment Company, Inc. | 13G/A | 4.30%3.93M shares | −2.60 ppfrom 6.90%Below 5% | Jun 30, 2025 | SEC |
| Aug 14, 20252:15 PM ET | AWM Investment Company, Inc. | 13G | 6.90%619.9K shares | New | Jun 30, 2025 | SEC |
| Apr 11, 202512:43 PM ET | BNP Paribas Asset Management UK Ltd | 13G | 5.10%3.63M shares | New | Mar 31, 2025 | SEC |
| Feb 18, 20256:23 AM ET | Mann Paul Elliot | 13G/A | 10.80%7.71M shares | −1.10 ppfrom 11.90% | Dec 31, 2024 | SEC |
| Feb 18, 20256:22 AM ET | Mann Paul Elliot | 13G/A | 11.90%6.58M shares | −2.30 ppfrom 14.20% | Dec 31, 2023 | SEC |
| Feb 14, 20256:55 PM ET | Mann Paul Elliot | 13G | 14.20%5.31M shares | New | Dec 31, 2022 | SEC |
| Feb 12, 20254:05 PM ET | AK Jensen Investment Management Ltd | 13G/A | 6.60%4.71M shares | – | Dec 31, 2024 | SEC |
| Feb 4, 20251:32 PM ET | BlackRock, Inc. | 13G | 5.50%3.96M shares | New | Dec 31, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell ASP Isotopes Inc. shares.
No Form 144 notices for ASP Isotopes Inc. are on file.