DEEP FISSION, INC.|4Feb 23, 9:10 PM ET

Peres Mark Wayne 4

4 · DEEP FISSION, INC. · Filed Feb 23, 2026

AI-generated summary of this filing

Updated Feb 24, 2026

Deep Fission CNO Mark Peres Receives 40,000-Unit Award

What Happened

Mark Peres, Chief Nuclear Officer of Deep Fission, was granted two derivative awards on Feb 19, 2026: 25,000 units and 15,000 units (total 40,000). Each award was reported at $0.00 per unit (typical for equity grants) and recorded as an award/grant (Form 4 code A). These are not immediate cash purchases or sales — they are equity awards subject to vesting.

Key Details

Transaction date: 2026-02-19; Form 4 filed: 2026-02-23 (filed within the usual two business-day window).
Reported price: $0.00 per unit; reported total value on the Form 4: $0.
Shares owned after transaction: not specified in the filing.
Footnote F1: The 25,000-unit award is an RSU-type grant that vests only after both a service requirement and a liquidity-event condition are met. Service vesting: 25% on the one-year anniversary, then monthly installments thereafter. Liquidity vesting: occurs on the earlier of a change in control, an IPO, or a direct listing.
Footnote F2: The 15,000-unit award follows a standard option-style vesting schedule noted in the filing: 25% vests on the first vesting date and then 1/36th vests each month thereafter until fully vested.
Transaction type: Award/Grant (derivative); not an outright purchase or sale.

Context

These awards are subject to multi-condition vesting (service and/or liquidity), so they do not represent immediately tradable shares and should not be interpreted as an immediate market buy/sell signal. Awards at $0 are common for employee compensation; the economic value depends on future company performance and vesting triggers (including an IPO or change in control).

Form 4

Period: 2026-02-19

Chief Nuclear Officer

Transactions

Award
Restricted Stock Unit
[F1]
2026-02-19+25,000→ 25,000 total
Exercise: $0.00Exp: 2033-02-19→ Common Stock (25,000 underlying)
Award
Employee Stock Option (right to buy)
[F2]
2026-02-19+15,000→ 15,000 total
Exercise: $15.00From: 2027-02-19Exp: 2036-02-19→ Common Stock (15,000 underlying)

Footnotes (2)

[F1]Each RSU vests based on attainment of both a service-based vesting condition and liquidity event vesting condition, in each case, prior to the expiration date. 25% of the service-based vesting condition will be satisfied on the one-year anniversary of the grant date and the remainder in equal monthly installments thereafter, subject to the reporting person's continued service through the vesting dates. The liquidity event condition will be satisfied on the earliest to occur of a change in control, initial public offering or direct listing.
[F2]Date at which first vesting occurs is indicated. One-fourth of the total number of options to purchase the Company's common stock vests on the first vesting date shown and an additional one-thirty sixth on each month thereafter until fully vested.

Signature

/s/ Jon Gordon as attorney-in-Fact for Mark Peres|2026-02-23

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