Sophie McCallum - 06 Oct 2026 Form 4 Insider Report for Deep Isolation Nuclear, Inc. (DBHL)

Reporting relationship: Chief of Staff
Issuer ticker: DBHL
Reported as of: 06 Oct 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 08 Oct 2026, 20:30:44 UTC
Prior SEC filing: 21 Nov 2025
Source filing: View source filing
Reporting owner signature: /s/ Sophie McCallum

Filing notes and source

Key filing fact

Sophie McCallum filed Form 4 for Deep Isolation Nuclear, Inc. (DBHL) on 08 Oct 2026.

Key facts

This page summarizes Sophie McCallum's Form 4 filing for Deep Isolation Nuclear, Inc. (DBHL).
3 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 08 Oct 2026, 20:30.

Change

Previous filing in this sequence was filed on 21 Nov 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002085363 Primary reporting owner

McCallum Sophie

Relationship: Chief of Staff
Address: C/O DEEP ISOLATION NUCLEAR, INC., 5717 LEGACY DRIVE, STE 250, OFFICE 2079, PLANO
Signature: /s/ Sophie McCallum
Signature date: 08 Oct 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

DBHL transaction

Common Stock

Award

Transaction value
Shares: +40,179
Change %: +241%
Price: $0.000000^*
Shares after: 56,846
Date: 06 Oct 2026
Ownership: Direct
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

DBHL transaction Derivative

Stock Option (right to buy)

Award

Transaction value
Shares: +62,206
Change %
Price: $0.000000^*
Shares after: 62,206
Date: 06 Oct 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 62,206
Exercise price: $3.50
Footnotes: F2

DBHL transaction Derivative

Stock Option (right to buy)

Award

Transaction value
Shares: +2,301
Change %
Price: $0.000000^*
Shares after: 2,301
Date: 06 Oct 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 2,301
Exercise price: $3.50
Footnotes: F2, F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote 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: 10,045 RSUs on September 29, 2027, 10,045 RSUs on September 29, 2028, 10,044 RSUs on September 29, 2029 and 10,045 RSUs on September 29, 2030, in each case subject to the Reporting Person's continued service through each vesting date.

Footnote 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: 16,127 option shares on September 29, 2027, 1,344 option shares on October 29, 2027, 386 option shares on November 29, 2027, and the remaining option shares in monthly installments on the 29th day of each month (or the last day of the month, if earlier) from January 29, 2028 through September 29, 2030, in each case subject to the Reporting Person's continued service through each vesting date.

Footnote F3

Represents a grant of non-qualified stock option pursuant to the Deep Isolation Nuclear, Inc. 2025 Equity Incentive Plan. The option shall vest as follows: 958 option shares on November 29, 2027 and 1,343 option shares on December 29, 2027, in each case subject to the Reporting Person's continued service through each vesting date.