GLANVILLE THOMAS S 4

What Happened
Thomas S. Glanville, a director of Deep Fission, Inc., was granted 3,334 restricted stock units (RSUs) on March 9, 2026. The grant was reported as a derivative award (code A) with an acquisition price of $0.00, meaning no cash was paid at grant and no shares were issued immediately.

Key Details

• Transaction date and price: 2026-03-09, grant of 3,334 RSUs at $0.00 per unit.
• Transaction type: Award/Grant of restricted stock units (derivative security).
• Shares owned after transaction: Not disclosed in this Form 4.
• Vesting and distribution (footnote): Each RSU converts to one common share upon vesting on the one-year anniversary of the grant, contingent on continued service. After vesting, the holder may elect to defer receipt of shares until a qualifying distribution event or termination of service per the company’s equity plan (see footnote F1).
• Filing timeliness: Reported on Form 4 filed 2026-03-10 for a 2026-03-09 grant (appears timely).

Context
RSU grants are compensation awards, not open-market purchases or sales. They represent a contingent right to future shares if vesting conditions are met; there is no immediate market value realized until the RSUs vest and are converted into shares (and then value depends on the stock price at that time). This grant does not by itself indicate buying or selling pressure by the insider.