ASP Isotopes (ASPI) EVP sells 100,000 shares, retains 800,000

Rhea-AI Filing Summary

ASP Isotopes Inc. executive Donald George Ainscow, EVP, General Counsel and Secretary, reported an open-market sale of 100,000 shares of Common Stock. The weighted average sale price was $6.14 per share, with individual trades occurring between $6.11 and $6.17 per share.

Following this transaction, Ainscow directly holds 800,000 shares of ASP Isotopes Inc. common stock. The filing notes that detailed trade-by-trade pricing within the reported range is available upon request.

Insider Trade Summary

Net Seller: 100,000 shares ($614,000)

Net Sell 1 txn

Insider Ainscow Donald George

Role EVP, Gen Counsel, Secretary

Sold 100,000 shs ($614K)

Type	Security	Shares	Price	Value
Sale	Common Stock	100,000	$6.14	$614K

Holdings After Transaction: Common Stock — 800,000 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Shares sold: 100,000 shares Weighted average sale price: $6.14 per share Sale price range: $6.11–$6.17 per share +1 more

4 metrics

Shares sold 100,000 shares Open-market sale of Common Stock

Weighted average sale price $6.14 per share Average price for 100,000 shares sold

Sale price range $6.11–$6.17 per share Range of prices across multiple transactions

Shares owned after transaction 800,000 shares Direct holdings following the sale

Key Terms

weighted average price, open-market sale, Common Stock, Securities and Exchange Commission

4 terms

weighted average price financial

"The price reported in Column 4 is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Common Stock financial

""security_title": "Common Stock""

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.

Securities and Exchange Commission regulatory

"staff of the Securities and Exchange Commission, upon request"

A national government agency that enforces rules for buying, selling and disclosing information about stocks and other investments, acting like a referee and scorekeeper for financial markets. It requires companies to share clear, regular financial and business information and investigates fraud or rule-breaking, which matters to investors because those rules and disclosures help ensure fair prices, reduce hidden risks and make it easier to compare investment choices.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/02/2026 - 09:45 PM Accepted by SEC EDGAR 07/02/2026 - 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)
06/30/2026

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	06/30/2026		S		100,000	D	$6.14(1)	800,000	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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.11 to $6.17, 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 this footnote.

	/s/ Donald Ainscow	07/02/2026
	** 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 Donald George Ainscow?

ASP Isotopes reported that EVP, General Counsel and Secretary Donald George Ainscow sold 100,000 shares of Common Stock in an open-market transaction at a weighted average price of $6.14 per share, as disclosed in a Form 4 insider filing.

At what prices were Donald George Ainscow’s ASP Isotopes (ASPI) shares sold?

The 100,000 ASP Isotopes shares were sold at a weighted average price of $6.14 per share. Individual trades occurred in multiple transactions, with prices ranging from $6.11 to $6.17 per share, according to the Form 4 footnote.

How many ASP Isotopes (ASPI) shares does Donald George Ainscow own after the sale?

After selling 100,000 shares, Donald George Ainscow directly holds 800,000 shares of ASP Isotopes common stock. This post-transaction holding reflects his remaining direct ownership position as reported in the Form 4 filing with the Securities and Exchange Commission.

What type of insider transaction did ASP Isotopes (ASPI) disclose for Ainscow?

The Form 4 identifies the transaction as an open-market sale of ASP Isotopes Common Stock. It is coded as a “S” transaction, meaning a sale in the open market or a private transaction, rather than an option exercise, gift, or tax-withholding event.

Can investors see the detailed trade prices for Ainscow’s ASP Isotopes (ASPI) sale?

Yes. The Form 4 footnote states the reported price is a weighted average and that full details of the number of shares sold at each separate price between $6.11 and $6.17 are available from the company, any stockholder, or SEC staff upon request.