Deep Isolation director granted 70,000 RSUs

A DBHL director received 70,000 immediately vested RSUs with share delivery deferred until specific future events.

Rhea-AI Filing Summary

Deep Isolation Nuclear, Inc. (DBHL) reported that director Renee J. Hornbaker received a grant of 70,000 restricted stock units (RSUs) of common stock on September 16, 2026 under the 2025 Equity Incentive Plan. The RSUs vested immediately but will convert into shares only upon a change of control, her separation of service as a director, or her death. Following this award, she holds 113,333 shares of common stock directly. No Rule 10b5-1 trading plan is reported in connection with this grant.

Insider Trade Summary

Grant/Award: 70,000 shares

Grant/Award 1 txn

Insider HORNBAKER RENEE J

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock F1	70,000	$0.00	$0.00

Holdings After Transaction: Common Stock — 113,333 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 issuance the RSUs immediately vested, but their conversion into shares of common stock of the Issuer 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

RSUs granted: 70,000 units Price per share: $0.00 per share Shares following transaction: 113,333 shares +2 more

5 metrics

RSUs granted 70,000 units Grant of restricted stock units on September 16, 2026

Price per share $0.00 per share Reported transaction price for the RSU award

Shares following transaction 113,333 shares Direct common stock holdings after the RSU grant

RSU-to-share ratio 1 share per RSU Each RSU represents a contingent right to receive one share of common stock

Trigger events for settlement 3 events Change of control, separation of service as director, or death

Key Terms

restricted stock units, Equity Incentive Plan, change of control, separation of service

4 terms

restricted stock units financial

"Represents a grant of restricted stock units ("RSUs") to the Reporting Person"

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.

Equity Incentive Plan financial

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

An equity incentive plan is a program that gives employees, executives or directors the right to receive company stock or options to buy stock as part of their pay. Think of it as offering slices of future company profit to motivate people to boost long‑term performance; for investors it matters because it can align employee goals with shareholder value but also increases the number of shares outstanding, which can dilute existing ownership.

change of control financial

"until the earliest of the following events to occur: (i) a change of control"

A change of control occurs when the ownership or management of a company shifts significantly, such as through a sale, merger, or acquisition, resulting in new leadership or ownership structure. This change can impact the company's direction and decision-making, which is important for investors because it may affect the company's stability, strategy, and future prospects.

separation of service financial

"(ii) a separation of service as a director by the Reporting Person"

FAQ

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

What did DBHL director Renee J. Hornbaker report on this Form 4?

She reported an acquisition of 70,000 RSUs of Deep Isolation Nuclear, Inc. common stock on September 16, 2026, received as a grant under the company’s 2025 Equity Incentive Plan.

How many DBHL shares does Renee J. Hornbaker hold after this transaction?

After the RSU grant, Renee J. Hornbaker is reported to hold 113,333 shares of Deep Isolation Nuclear, Inc. common stock directly.

What are the vesting and settlement terms of the 70,000 DBHL RSUs?

The 70,000 RSUs vested immediately upon grant, but conversion into DBHL common shares is deferred until the earliest of a change of control, her separation of service as a director, or her death.

What does one RSU represent in this DBHL Form 4 filing?

Each RSU represents a contingent right to receive one share of Deep Isolation Nuclear, Inc. common stock upon the occurrence of specified future events.

Was this DBHL RSU grant made under a Rule 10b5-1 trading plan?

No. The filing’s Rule 10b5-1 checkbox is not marked as affirmative, and the grant is reported without reference to a Rule 10b5-1 trading plan.

What plan governs the RSU grant reported for DBHL?

The RSU grant was made pursuant to the Deep Isolation Nuclear, Inc. 2025 Equity Incentive Plan, under which each RSU is a contingent right to receive one share of common stock.

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

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Available on EDGAR 09/18/2026 - 09:24 PM Accepted by SEC EDGAR 09/18/2026 - 09:23 PM 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^*

HORNBAKER RENEE J

(Last) (First) (Middle)

200 S. WILCOX DRIVE

(Street)

KINGSPORT TENNESSEE 37660-5280

(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		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/16/2026

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)	09/16/2026		A		70,000	A	$0	113,333	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 issuance the RSUs immediately vested, but their conversion into shares of common stock of the Issuer 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/ Renee J. Hornbaker	09/18/2026
	** 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)