ASP Isotopes (ASPI) CFO receives 840,000-share equity award

Rhea-AI Filing Summary

ASP Isotopes Inc. reported that Chief Financial Officer Heather Kiessling acquired 840,000 shares of common stock through a stock award with a grant price of $0.0000 per share. Following this award, she holds a total of 1,549,376 common shares directly.

The award will vest in semi-annual installments over a four-year period, subject to applicable vesting conditions, meaning the shares are earned gradually over time rather than all at once.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Kiessling Heather

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	840,000	$0.00	--

Holdings After Transaction: Common Stock — 1,549,376 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Stock award size: 840,000 shares Grant price per share: $0.0000 per share Post-transaction holdings: 1,549,376 shares +1 more

4 metrics

Stock award size 840,000 shares Common stock grant to CFO Heather Kiessling

Grant price per share $0.0000 per share CFO common stock award

Post-transaction holdings 1,549,376 shares CFO direct common stock ownership after award

Vesting schedule Semi-annual over 4 years CFO stock award vesting subject to conditions

Key Terms

Grant, award, or other acquisition, vesting conditions, semi-annual installments, direct ownership

4 terms

Grant, award, or other acquisition financial

"transaction_code_description: Grant, award, or other acquisition"

vesting conditions financial

"shall vest (subject to compliance with applicable vesting conditions) in semi-annual installments"

Vesting conditions are the rules that determine when someone earning company stock or stock options actually gains the right to keep or sell them, typically based on staying with the company for a set time or meeting performance targets. Think of it like keys that unlock gradually — some unlock by calendar date, others only after agreed milestones. Investors care because vesting shapes management incentives, the timing of share sales, and the number of shares that can enter the market, which can affect a company's valuation and ownership mix.

semi-annual installments financial

"shall vest ... in semi-annual installments over a four-year period"

direct ownership financial

"ownership_type: direct; total_shares_following_transaction: 1549376.0000"

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Form 4 Insider Transactions: What Each Field Means →

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Kiessling Heather

(Last) (First) (Middle)

C/O ASP ISOTOPES INC.

2200 ROSS AVENUE, SUITE 4575E

(Street)

DALLAS TEXAS 75201

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/28/2026

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

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

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

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	05/28/2026(1)		A		840,000	A	(1)	1,549,376	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

Explanation of Responses:

1. This award of common stock shall vest (subject to compliance with applicable vesting conditions) in semi-annual installments over a four-year period beginning on the grant date.

	/s/ Donald Ainscow, as attorney-in-fact	06/03/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did ASP Isotopes (ASPI) report for its CFO?

ASP Isotopes reported a stock award to its CFO. Chief Financial Officer Heather Kiessling received a grant of 840,000 shares of common stock at a grant price of $0.0000 per share, increasing her direct holdings to 1,549,376 shares.

How many ASP Isotopes (ASPI) shares does the CFO hold after the grant?

After the grant, the CFO holds 1,549,376 shares. The Form 4 shows that Heather Kiessling’s direct ownership increased following the 840,000-share stock award, bringing her total directly held common shares to 1,549,376.

What type of transaction is the 840,000-share award for ASP Isotopes (ASPI) CFO?

The transaction is a grant or award acquisition. It is coded as “A” on the Form 4, described as a grant, award, or other acquisition of common stock, rather than an open-market purchase or sale.

Does the ASP Isotopes (ASPI) CFO stock award vest immediately?

No, the stock award vests over four years. The 840,000-share grant will vest in semi-annual installments during a four-year period, subject to compliance with applicable vesting conditions, so the shares are earned over time.

Is the ASP Isotopes (ASPI) CFO stock award a market purchase?

No, it is an equity compensation grant. The shares were acquired at a grant price of $0.0000 per share under a stock award, indicating compensation rather than a cash-funded, open-market purchase transaction.