[Form 4] ASP Isotopes Inc. Insider Trading Activity

Rhea-AI Filing Summary

Todd Wider, a director of ASP Isotopes Inc. (ASPI), executed equity transactions on 09/14/2025 and 09/15/2025. He acquired 96,000 shares through exercise of stock options with a conversion/exercise price of $2, and the reported ownership following that transaction was 806,230 shares. The filing also reports 21,892 shares withheld to satisfy option exercise-related obligations at an average price of $8.77, and a sale of 74,108 shares on 09/15/2025 at a weighted average price of $8.7551, leaving beneficial ownership of 710,230 shares after the reported transactions.

Positive

• 96,000 shares were acquired by exercise of options at a $2 exercise price
• Reporting shows a clear net-share settlement and tax-withholding mechanism (non-cash settlement of 21,892 shares)

Negative

• The reporting person sold 74,108 shares at a weighted average price of $8.7551, reducing beneficial ownership
• Beneficial ownership decreased from 806,230 to 710,230 shares after reported transactions

Insights

Insider Transactions Specialist

Director exercised options for 96,000 shares and sold 74,108 shares, with 21,892 shares withheld for tax/settlement.

The filing shows an option exercise at a $2 exercise price converting to 96,000 common shares, and simultaneous share movements that include withheld shares and open-market sales at a weighted average price of $8.7551.

This matters because the transactions change the reporting person's beneficial ownership from 806,230 shares down to 710,230 shares after sales and withholdings; the paperwork also documents the tax-withholding and net-share settlement mechanics used to satisfy exercise and tax obligations.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Wider Todd

(Last) (First) (Middle)

601 PENNSYLVANIA AVENUE NW,

SOUTH BUILDING, SUITE 900

(Street)

WASHINGTON DC 20004

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
ASP Isotopes Inc. [ ASPI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
09/14/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/14/2025		M		96,000	A	$2	806,230	D
Common Stock	09/14/2025		F(1)		21,892	D	$8.77	784,338	D
Common Stock	09/15/2025		S(2)		74,108	D	$8.7551(3)	710,230	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (right to buy)	$2	09/14/2025		M			96,000	04/04/2023(4)	04/04/2032	Common Stock	96,000	$0	0	D

Explanation of Responses:

1. 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.

2. 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.

3. 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.

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

Remarks:

	/s/ Donald Ainscow, as attorney-in-fact	10/03/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What transactions did ASPI director Todd Wider report?

He reported exercising options to acquire 96,000 shares at a $2 exercise price, 21,892 shares withheld for settlement/taxes, and a sale of 74,108 shares.

How did these transactions affect Todd Wider's ownership in ASPI?

Beneficial ownership following the reported transactions was 710,230 shares, down from 806,230 after the option exercise and subsequent sales/withholdings.

At what prices were the shares withheld or sold?

Withheld shares are reported at an average of $8.77; sold shares were at a weighted average price of $8.7551 (sales ranged from $8.37 to $9.40).

What was the exercise price and expiration for the options exercised?

The exercised stock option had an exercise price of $2, was granted on 04/04/2022, became exercisable on 04/04/2023, and expires on 04/04/2032.

Why were shares withheld in the transaction?

The filing states 21,892 shares were withheld by the company in connection with net share settlement to satisfy the option exercise price and related tax liabilities.