Duncan Moore - Aug 29, 2025 Form 4 Insider Report for ASP Isotopes Inc. (ASPI)

Role: Director
Signature: /s/ Donald Ainscow, as attorney-in-fact
Stock symbol: ASPI
Transactions as of: Aug 29, 2025
Transactions value $: -$696,233
Form type: 4
Date filed: 9/3/2025, 05:40 PM
Previous filing: Dec 11, 2024
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Moore Duncan	Director	C/O ASP ISOTOPES INC., 601 PENNSYLVANIA AVENUE NW, SUITE 900, WASHINGTON, DC	/s/ Donald Ainscow, as attorney-in-fact	2025-09-03	0001888265

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ASPI	Common Stock	Sale	-$696K	-75K	-7.01%	$9.28	995K	Aug 29, 2025	Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The sale of shares reported in this Form 4 includes an amount for the purpose of satisfying the reporting person's income tax liabilities resulting from the vesting of a previously granted restricted stock award for 200,000 shares pursuant to an issuer equity incentive plan.
F2	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.95 to $10.20, 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 2.

Content

The sale of shares reported in this Form 4 includes an amount for the purpose of satisfying the reporting person's income tax liabilities resulting from the vesting of a previously granted restricted stock award for 200,000 shares pursuant to an issuer equity incentive plan.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.95 to $10.20, 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 2.