Deep Isolation Nuclear awards chair a stock grant

The units vest subject to continued service, while conversion into common shares is deferred until a change of control, director separation, or death.

Rhea-AI Filing Summary

Deep Isolation Nuclear, Inc. (DBHL) reports that Chair of the Board Elizabeth Muller, a director and 10% owner, received an award of 23,214 restricted stock units on October 6, 2026, under its 2025 Equity Incentive Plan. The units vest on September 29, 2027, subject to her continued service through each vesting date. Each unit represents a contingent right to receive one common share upon vesting. Conversion into shares is deferred until the earliest of a change of control, her separation from service as a director, or her death. Her reported direct holdings following the transaction were 11,771,267 shares.

Insider Trade Summary

Grant/Award: 23,214 shares

Grant/Award 1 txn

Insider Muller Elizabeth

Role Director, 10% Owner

Type	Security	Shares	Price	Value
Grant/Award	Common Stock F1	23,214	$0.00	$0.00

Holdings After Transaction: Common Stock — 11,771,267 shares (Direct)

Footnotes (1)

1. F1. Represents a grant of restricted stock units ("RSUs") to the Reporting Person pursuant to the Deep Isolation Nuclear, Inc. 2025 Equity Incentive Plan. Each RSU represents a contingent right to receive one share of common stock upon vesting. The RSUs shall vest on September 29, 2027, subject to the Reporting Person's continued service through each vesting date. Conversion of the RSUs into shares of common stock of the Issuer upon vesting is deferred until the earliest of the following events to occur: (i) a change of control of the Issuer, (ii) a separation of service as a director by the Reporting Person, or (iii) death of the Reporting Person.

Key Figures

Restricted stock units awarded: 23,214 RSUs Direct holdings following transaction: 11,771,267 shares Common shares per RSU: 1 share +1 more

4 metrics

Restricted stock units awarded 23,214 RSUs Awarded October 6, 2026

Direct holdings following transaction 11,771,267 shares Reported following the transaction

Common shares per RSU 1 share Contingent right upon vesting

Vesting date September 29, 2027 Subject to continued service through each vesting date

Key Terms

restricted stock units, vesting, contingent right

3 terms

restricted stock units financial

"grant of restricted stock units ("RSUs")"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

vesting financial

"shall vest on September 29, 2027"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

contingent right financial

"contingent right to receive one share of common stock"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many RSUs did DBHL Chair Elizabeth Muller receive?

Elizabeth Muller received an award of 23,214 restricted stock units on October 6, 2026, under Deep Isolation Nuclear, Inc.'s 2025 Equity Incentive Plan. Each unit represents a contingent right to receive one common share upon vesting.

When do Elizabeth Muller's DBHL RSUs vest?

The units vest on September 29, 2027, subject to Elizabeth Muller's continued service through each vesting date.

When are Elizabeth Muller's DBHL RSUs converted into common shares?

Conversion into common shares upon vesting is deferred until the earliest of a change of control, Elizabeth Muller's separation from service as a director, or her death.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/08/2026 - 08:34 PM EDT Accepted by SEC EDGAR 10/08/2026 - 08:34 PM EDT 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^*

Muller Elizabeth

(Last) (First) (Middle)

C/O DEEP ISOLATION NUCLEAR, INC.

5717 LEGACY DRIVE, STE 250, OFFICE 2079

(Street)

PLANO TEXAS 75024

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Deep Isolation Nuclear, Inc. [ DBHL ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
	Officer (give title below)	X	Other (specify below)
			Chair of the Board

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/06/2026

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(1)	10/06/2026		A		23,214	A	$0	11,771,267	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. Represents a grant of restricted stock units ("RSUs") to the Reporting Person pursuant to the Deep Isolation Nuclear, Inc. 2025 Equity Incentive Plan. Each RSU represents a contingent right to receive one share of common stock upon vesting. The RSUs shall vest on September 29, 2027, subject to the Reporting Person's continued service through each vesting date. Conversion of the RSUs into shares of common stock of the Issuer upon vesting is deferred until the earliest of the following events to occur: (i) a change of control of the Issuer, (ii) a separation of service as a director by the Reporting Person, or (iii) death of the Reporting Person.

	/s/ Elizabeth Muller	10/08/2026
	** 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)