Elizabeth Muller - Oct 1, 2025 Form 4 Insider Report for Deep Isolation Nuclear, Inc.

Role: Director, 10%+ Owner
Signature: /s/ Elizabeth Muller
Transactions as of: Oct 1, 2025
Transactions value $: $0
Form type: 4
Date filed: 10/7/2025, 06:48 PM
Previous filing: Sep 9, 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Muller Elizabeth	Director, 10%+ Owner	C/O DEEP ISOLATION NUCLEAR, INC., 2001 ADDISON STREET, SUITE 300, BERKELEY	/s/ Elizabeth Muller	2025-10-07	0002081850

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction		Common Stock	Award	$0	+32.5K	+0.28%	$0.00	11.7M	Oct 1, 2025	Direct	F1

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
transaction		Stock Option (Right to Buy)	Award	$0	+10.8K		$0.00	10.8K	Oct 1, 2025	Common Shares	10.8K	$3.00	Direct	F2

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

Explanation of Responses:

Id	Content
F1	Represents the grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's common stock upon settlement. The RSUs are subject to a 4-year vesting period, whereby 1/48th of the RSUs will vest monthly beginning October 1, 2025, subject to the Reporting Person's continuous service through each vesting date.
F2	The Stock Option is subject to a 4-year vesting schedule, whereby 1/48th of the option shares will vest monthly beginning on October 1, 2025, subject to Reporting Person's continued service through each vesting date.