Leslie Goldman - Jul 23, 2025 Form 3 Insider Report for Deep Isolation Nuclear, Inc.

Role: Director
Signature: /s/ Leslie Goldman Tepper
Transactions as of: Jul 23, 2025
Transactions value $: $0
Form type: 3
Date filed: 8/5/2025, 07:10 PM
Previous filing: Apr 8, 2025
Next filing: Oct 3, 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Goldman Tepper Leslie	Director	C/O DEEP ISOLATION NUCLEAR, INC., 2001 ADDISON STREET, SUITE 300, BERKELEY	/s/ Leslie Goldman Tepper	2025-08-05	0002062355

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding		Common Stock						65.2K	Jul 23, 2025	Direct	F1
holding		Common Stock						25K	Jul 23, 2025	By Bella AJT Holdings, LLC	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
holding		Stock Option (Right to Buy)							Jul 23, 2025	Common Stock	77.5K	$0.20	Direct	F3, F4
holding		Stock Option (Right to Buy)							Jul 23, 2025	Common Stock	271K	$0.18	Direct	F5, F6

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Received in connection with the Issuer's merger (the "Merger") with Deep Isolation, Inc. ("Deep Isolation") in accordance with the terms of the Agreement and Plan of Merger and Reorganization dated as of July 23, 2025, by and among the Issuer (f/k/a Aspen-1 Acquisition Inc..), Deep Isolation Acquisition Corp. and Deep Isolation (the "Merger Agreement"), in exchange for 2,523 shares of Deep Isolation common stock held by the Reporting Person immediately prior to the effective time of the Merger. Pursuant to the terms of the Merger Agreement, at the effective time of the Merger, each issued and outstanding share of Deep Isolation capital stock was converted into the right to receive 25.837283 shares of the Issuer's common stock (the "Conversion Ratio"), rounded to the nearest whole share. The Merger closed on July 23, 2025.
F2	The Reporting Person is a member of Bella AJT Holdings, LLC and shares voting and investment power over and a pecuniary interest in the securities held by such entity.
F3	The stock option is subject to a 4-year vesting schedule, with 25% of the option shares vested as of May 1, 2023 and 1/48th of the remaining shares vesting monthly over the 36-month period thereafter, subject to the Reporting Person's continued service through each vesting date.
F4	Received in connection with Merger in accordance with the terms of the Merger Agreement, in exchange for options to acquire 3,000 shares of Deep Isolation common stock at an exercise price of $5.20 per share held by the Reporting Person immediately prior to the effective time of the Merger. Pursuant to the terms of the Merger Agreement, at the effective time of the Merger, the number of shares of Deep Isolation common stock subject to each outstanding but unexercised option to purchase Deep Isolation common stock (each such option, an "Outstanding Option," and such number of shares of Deep Isolation common stock subject to such Outstanding Option, the "option shares") was converted into an option to purchase the number of shares of the Issuer's common stock equal to the option shares multiplied by the Conversion Ratio, rounded to the nearest whole share, and the exercise price of each Outstanding Option was divided by the Conversion Ratio, rounded to the nearest whole cent.
F5	The stock option is subject to a 4-year vesting schedule, with 25% of the option shares vested as of June 1, 2024 and 1/48th of the remaining shares vesting monthly over the 36-month period thereafter, subject to the Reporting Person's continued service through each vesting date.
F6	Received in connection with Merger in accordance with the terms of the Merger Agreement in exchange for options to acquire 10,500 shares of Deep Isolation common stock at an exercise price of $4.61 per share held by the Reporting Person immediately prior to the effective time of the Merger. Pursuant to the terms of the Merger Agreement, at the effective time of the Merger, the number of option shares subject to each Outstanding Option was converted into an option to purchase the number of shares of the Issuer's common stock equal to the option shares multiplied by the Conversion Ratio, rounded to the nearest whole share, and the exercise price of each Outstanding Option was divided by the Conversion Ratio, rounded to the nearest whole cent.