ASP Isotopes Inc. — Director's Dealing 2025

Dec 30, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ASP Isotopes Inc. (ASPI)
CIK: 0001921865
Period of Report: 2025-12-18-05:00

Reporting Person: Kiessling Heather (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-12-18-05:00	Common Stock	S	80000	$5.798	Disposed	732500	Direct

Footnotes

F1: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.73 to $5.885, 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 Footnote 1.