SEC Form 4 · accession 0001477932-26-004177
ASP Isotopes Inc. · ASPI
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Heather Kiessling
Officer — Chief Financial Officer
Period of report
Jul 1, 2026
Accepted (ET)
Jul 2, 2026 · 9:45 pm EDT
Rule 10b5-1 plan
yes — trade under a plan
Issuer CIK
0001921865
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common StockF2 | Jul 1, 2026 | S | 23,124 | $6.28 | D | 1,526,252 | D |
Table II — derivative securities
No Table II lines on this filing.
Explanation of responses
- F1Represents "sell to cover" sales effected pursuant to a Rule 10b5-1 trading plan adopted by the filing person on December 19, 2025 to cover tax withholding obligations in connection with the quarterly vesting of a restricted stock award.
- F2The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.13 to $6.52, inclusive. The reporting person undertakes to provide ASP Isotopes Inc. (the "Company"), any stockholder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.