ASP Isotopes EVP awarded 400,000 common shares

Ainscow Donald George reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Ainscow Donald George reported acquisition or exercise transactions in this Form 4 filing.

ASP Isotopes Inc. executive vice president and general counsel Donald George Ainscow received an award of 400,000 shares of common stock as compensation. The filing shows he now holds 900,000 common shares directly. The award will vest in semi-annual installments over four years, subject to applicable vesting conditions beginning on the grant date.

Insider Trade Summary

Grant/Award: 400,000 shares

Grant/Award 1 txn

Insider Ainscow Donald George

Role EVP, Gen Counsel, Secretary

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	400,000	$0.00	$0.00

Holdings After Transaction: Common Stock — 900,000 shares (Direct)

Footnotes (1)

1. F1. 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.

Key Figures

Stock award size: 400,000 shares Post-transaction holdings: 900,000 shares Grant price per share: $0.0000 per share +1 more

4 metrics

Stock award size 400,000 shares Common stock grant to EVP, Gen Counsel, Secretary

Post-transaction holdings 900,000 shares Common stock directly owned after award

Grant price per share $0.0000 per share Reported transaction price for awarded common stock

Vesting period 4 years, semi-annual Award vests in semi-annual installments over four years

Key Terms

Grant, award, or other acquisition, vesting conditions, semi-annual installments, common stock

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"

common stock financial

"This award of common stock shall vest ... in semi-annual installments"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did ASP Isotopes (ASPI) report for Donald George Ainscow?

ASP Isotopes reported that executive Donald George Ainscow received an award of 400,000 shares of common stock. This was a compensation-related grant at no stated purchase price, increasing his directly held position to 900,000 common shares after the award.

How many ASP Isotopes (ASPI) shares does Donald George Ainscow hold after this Form 4?

After the reported award, Donald George Ainscow holds 900,000 shares of ASP Isotopes common stock directly. This figure includes the 400,000-share grant disclosed in the filing and reflects his total direct ownership position immediately following the transaction.

What are the vesting terms of Donald George Ainscow’s ASP Isotopes stock award?

The award of ASP Isotopes common stock to Donald George Ainscow vests over four years. According to the filing footnote, the shares vest in semi-annual installments beginning on the grant date, and vesting remains subject to compliance with applicable vesting conditions.

Was Donald George Ainscow’s ASP Isotopes Form 4 a market purchase or sale?

The Form 4 shows a compensation-related acquisition, not a market trade. Ainscow received 400,000 shares of ASP Isotopes common stock as a grant or award, with a reported price per share of $0.0000, rather than buying or selling shares on the open market.

What role does Donald George Ainscow hold at ASP Isotopes (ASPI)?

Donald George Ainscow serves as Executive Vice President, General Counsel, and Secretary at ASP Isotopes. The Form 4 links this leadership role with a 400,000-share common stock award that vests semi-annually over four years, aligning part of his compensation with the company’s equity.

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Accepted by SEC EDGAR 06/03/2026 - 09:45 PM Learn about SEC filing dates

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^*

Ainscow Donald George

(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)
	EVP, Gen Counsel, Secretary

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		400,000	A	(1)	900,000	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	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)