Deep Isolation Nuclear grants GC 4,778-share option

Both awards vest subject to continued service, with the option schedule extending through September 29, 2030.

Rhea-AI Filing Summary

Deep Isolation Nuclear, Inc. (DBHL) reports that Paula Beck Whitten-Doolin, its GC and Corporate Secretary, received 2,976 restricted stock units and an incentive stock option covering 4,778 common shares on October 6, 2026. The RSUs are subject to continued service and vest through September 29, 2030; reported direct common stock holdings following the RSU award were 77,976 shares. The option has a $3.50 exercise price, begins vesting with 1,195 shares on September 29, 2027, continues in 36 monthly installments through September 29, 2030, and expires September 29, 2036.

Insider Trade Summary

Grant/Award: 7,754 shares

Grant/Award 2 txns

Insider Whitten-Doolin Paula Beck

Role GC and Corporate Secretary

Type	Security	Shares	Price	Value
Grant/Award	Stock Option (right to buy) F2	4,778	$0.00	$0.00
Grant/Award	Common Stock F1	2,976	$0.00	$0.00

Holdings After Transaction: Stock Option (right to buy) — 4,778 contracts (Direct); Common Stock — 77,976 shares (Direct)

Footnotes (2)

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 as follows: 744 RSUs on each of September 29, 2027, September 29, 2028, September 29, 2029 and September 29, 2030, in each case subject to the Reporting Person's continued service through each vesting date.
2. F2. Represents a grant of incentive stock option pursuant to the Deep Isolation Nuclear, Inc. 2025 Equity Incentive Plan. The option shall vest as follows: 1,195 option shares on September 29, 2027 and the remaining option shares in 36 monthly installments thereafter through September 29, 2030, in each case subject to the Reporting Person's continued service through each vesting date.

Key Figures

Restricted stock units granted: 2,976 RSUs Common shares underlying option: 4,778 shares Direct common shares following RSU award: 77,976 shares +4 more

7 metrics

Restricted stock units granted 2,976 RSUs Granted October 6, 2026

Common shares underlying option 4,778 shares Option granted October 6, 2026

Direct common shares following RSU award 77,976 shares Reported after the October 6, 2026 transaction

Exercise price $3.50 per share Incentive stock option

RSU installment 744 RSUs Each of four vesting dates from September 29, 2027 through September 29, 2030

Initial option vesting 1,195 option shares September 29, 2027

Option vesting installments 36 monthly installments After September 29, 2027, through September 29, 2030

Key Terms

restricted stock units, incentive stock option, contingent right, 2025 Equity Incentive Plan

4 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.

incentive stock option financial

"grant of incentive stock option"

An incentive stock option is a type of employee benefit that gives a worker the right to buy company shares at a fixed price, with special tax advantages if the employee holds the shares for a required period. Think of it as a coupon to buy future shares at today’s price that can result in lower tax on the gain. Investors care because ISOs can dilute share count, align staff incentives with the stock price, and affect company compensation costs and the timing of potential share sales.

contingent right financial

"Each RSU represents a contingent right to receive one share"

2025 Equity Incentive Plan financial

"pursuant to the Deep Isolation Nuclear, Inc. 2025 Equity Incentive Plan"

FAQ

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

How many shares did DBHL's corporate secretary receive in awards?

Paula Beck Whitten-Doolin received 2,976 restricted stock units and an incentive stock option covering 4,778 common shares on October 6, 2026.

When do DBHL's restricted stock units vest?

The 2,976 RSUs vest in four installments of 744 on September 29, 2027, September 29, 2028, September 29, 2029 and September 29, 2030, subject to Paula Beck Whitten-Doolin's continued service through each vesting date.

What is the vesting schedule for DBHL's stock option?

The option begins vesting with 1,195 option shares on September 29, 2027; the remaining option shares vest in 36 monthly installments thereafter through September 29, 2030. Vesting is subject to continued service through each vesting date.

What are the exercise price and expiration date of DBHL's stock option?

The option has a $3.50 exercise price and expires on September 29, 2036.

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

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Available on EDGAR 10/08/2026 - 08:28 PM EDT Accepted by SEC EDGAR 10/08/2026 - 08:27 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^*

Whitten-Doolin Paula Beck

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	GC and Corporate Secretary

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		2,976	A	$0	77,976	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
Stock Option (right to buy)(2)	$3.5	10/06/2026		A		4,778		(2)	09/29/2036	Common Stock	4,778	$0	4,778	D

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 as follows: 744 RSUs on each of September 29, 2027, September 29, 2028, September 29, 2029 and September 29, 2030, in each case subject to the Reporting Person's continued service through each vesting date.

2. Represents a grant of incentive stock option pursuant to the Deep Isolation Nuclear, Inc. 2025 Equity Incentive Plan. The option shall vest as follows: 1,195 option shares on September 29, 2027 and the remaining option shares in 36 monthly installments thereafter through September 29, 2030, in each case subject to the Reporting Person's continued service through each vesting date.

	/s/ Paula Whitten-Doolin	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)