Donald George Ainscow - 02 Sep 2026 Form 4 Insider Report for ASP Isotopes Inc. (ASPI)

Reporting relationship: EVP, Gen Counsel, Secretary
Issuer ticker: ASPI
Reported as of: 02 Sep 2026
Net transaction value: -$92,107
SEC form: 4
Accepted by SEC: 04 Sep 2026, 21:33:05 UTC
Prior SEC filing: 02 Jul 2026
Source filing: View source filing
Reporting owner signature: /s/ Donald Ainscow

Key filing fact

Donald George Ainscow filed Form 4 for ASP Isotopes Inc. (ASPI) on 04 Sep 2026.

Key facts

This page summarizes Donald George Ainscow's Form 4 filing for ASP Isotopes Inc. (ASPI).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 04 Sep 2026, 21:33.

Change

Previous filing in this sequence was filed on 02 Jul 2026.
Current net transaction value: -$92,107.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002079961 Primary reporting owner

Ainscow Donald George

Relationship: EVP, Gen Counsel, Secretary
Address: C/O ASP ISOTOPES INC., 2200 ROSS AVENUE, SUITE 4575E, DALLAS
Signature: /s/ Donald Ainscow
Signature date: 04 Sep 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ASPI transaction

Common Stock

Sale

Transaction value: $92,107
Shares: -23,678
Change %: -3%
Price: $3.89
Shares after: 776,322
Date: 02 Sep 2026
Ownership: Direct
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

Represents shares automatically sold by ASP Isotopes Inc. (the "Company") on behalf of the reporting person pursuant to a mandatory sell-to-cover provision in the award agreement required to cover minimum statutory tax withholding obligations. The sale does not represent a discretionary trade by the reporting person.

Footnote F2

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.885 to $3.9202, inclusive. The reporting person undertakes to provide 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.