Paul Elliot Mann - Nov 17, 2025 Form 4 Insider Report for ASP Isotopes Inc. (ASPI)

Role
Executive Officer, Director
Signature
/s/ Donald Ainscow, as attorney-in-fact
Stock symbol
ASPI
Transactions as of
Nov 17, 2025
Transactions value $
-$1,132,988
Form type
4
Date filed
11/28/2025, 09:41 PM
Previous filing
Sep 10, 2025
Next filing
Dec 3, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Mann Paul Elliot Executive Officer, Director C/O ASP ISOTOPES INC., 601 PENNSYLVANIA AVENUE NW, SUITE 900, WASHINGTON DC /s/ Donald Ainscow, as attorney-in-fact 2025-11-28 0001744816

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ASPI Common Stock Sale -$845K -113K -1.39% $7.51 7.97M Nov 17, 2025 Direct F1, F2
transaction ASPI Common Stock Sale -$288K -50K -0.63% $5.77 7.92M Nov 25, 2025 Direct F3, F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

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).

Explanation of Responses:

Id Content
F1 Represents "sell to cover" sales effected pursuant to a Rule 10b5-1 trading plan adopted by the filing person on June 9, 2025 to cover tax withholding obligations in connection with the vesting of restricted stock awards.
F2 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.215 to $7.85, 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 2.
F3 Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the filing person on December 13, 2024.
F4 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.54 to $6.015, 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 2.