ASP Isotopes Inc. — Director's Dealing 2025

Oct 4, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ASP Isotopes Inc. (ASPI)
CIK: 0001921865
Period of Report: 2025-09-14-05:00

Reporting Person: Wider Todd (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-09-14-05:00	Common Stock	M	96000	$2.00	Acquired	806230	Direct
2025-09-14-05:00	Common Stock	F	21892	$8.77	Disposed	784338	Direct
2025-09-15-05:00	Common Stock	S	74108	$8.7551	Disposed	710230	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-09-14-05:00	Stock Option (right to buy)	$2.00	M	96000	Disposed	2032-04-04-05:00	Common Stock (96000)	Direct

Footnotes

F1: 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 a stock option.

F2: 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 and the exercise of a stock option issued pursuant to an issuer equity incentive plan.

F3: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.37 to $9.40, 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 3.

F4: These options vested in a single installment 12 months after the grant date. The option was granted on April 4, 2022.