ASP Isotopes Inc. — Director's Dealing 2025

Sep 11, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ASP Isotopes Inc. (ASPI)
CIK: 0001921865
Period of Report: 2025-09-08-05:00

Reporting Person: Mann Paul Elliot (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-09-08-05:00	Common Stock	S	81076	$8.5279	Disposed	7234378	Direct
2025-09-09-05:00	Common Stock	M	216000	$2.00	Acquired	7450378	Direct
2025-09-09-05:00	Common Stock	F	50644	$8.53	Disposed	7399734	Direct
2025-09-09-05:00	Common Stock	M	1000000	$2.00	Acquired	8399734	Direct
2025-09-09-05:00	Common Stock	F	234466	$8.53	Disposed	8165268	Direct
2025-09-09-05:00	Common Stock	S	81077	$8.3886	Disposed	8084191	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-09-09-05:00	Employee Stock Option (right to buy)	$2.00	M	216000	Disposed	2032-04-04-05:00	Common Stock (216000)	Direct
2025-09-09-05:00	Employee Stock Option (right to buy)	$2.00	M	1000000	Disposed	2032-06-10-05:00	Common Stock (1000000)	Direct

Footnotes

F1: Represents "sell to cover" sales effected pursuant to a Rule 10b5-1 trading plan adopted by the filing person on June 9, 2025 to cover tax withholding obligations in connection with the vesting of restricted stock awards.

F2: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.135 to $8.575, inclusive. The reporting person undertakes to provide 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.

F3: Represents shares withheld by the Company in connection with net share settlement to satisfy the exercise price associated with the reporting person's exercise of employee stock options. No shares were sold by the reporting person to satisfy the exercise price or any tax liability.

F4: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.135 to $8.575, inclusive. The reporting person undertakes to provide 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.

F5: These options vested in a single installment 12 months after the grant date. The option was granted on April 4, 2022.

F6: These options vested in thirty-six equal installments beginning on the last day of month after the option's grant date. The option was granted on June 10, 2022.