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SEC Company Response from DEEP FISSION, (FISN) — Apr 29, 2026

DEEP FISSION, INC.
Date: April 29, 2026 · CIK: 0001918102 · Accession: 0001104659-26-051464

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File numbers found in text: 333-293510

Date
April 29, 2026
Author
William (Mark) Schmitz
Form
CORRESP
Company
DEEP FISSION, INC.

Letter

Re: Deep Fission, Inc. Registration Statement on Form S-1 File No. 333-293510

April 29, 2026

VIA EDGAR

United States Securities and Exchange Commission

Division of Corporation Finance

100 F Street, N.E.

Washington, D.C. 20549

Ladies and Gentlemen:

Pursuant to Rule 461 promulgated under the Securities Act of 1933, as amended, the undersigned registrant, Deep Fission, Inc., a Delaware corporation (the " Registrant "), hereby requests that the above-referenced Registration Statement on Form S-1 (the " Registration Statement ") be declared effective at 4:01 p.m., Eastern Time, on May 1, 2026, or as soon as practicable thereafter. Once the Registration Statement has been declared effective, please orally confirm that event with our counsel, Orrick, Herrington & Sutcliffe LLP, by calling Albert Vanderlaan at (617) 880-2219.

The Registrant hereby authorizes Albert Vanderlaan of Orrick, Herrington & Sutcliffe LLP to orally modify or withdraw this request for acceleration.

Thank you for your assistance in this matter.

Kind regards,

DEEP FISSION, INC.

By: /s/ William (Mark) Schmitz

Name: William (Mark) Schmitz

Title: Chief Financial Officer

cc: Albert Vanderlaan, Orrick, Herrington & Sutcliffe LLP

Show Raw Text
CORRESP
 1
 filename1.htm

 April 29, 2026

 VIA EDGAR

 United States Securities and Exchange Commission

 Division of Corporation Finance

 100 F Street, N.E.

 Washington, D.C. 20549

 Re: Deep Fission, Inc.
Registration Statement on Form S-1
File No. 333-293510

 Ladies and Gentlemen:

 Pursuant to Rule 461 promulgated
under the Securities Act of 1933, as amended, the undersigned registrant, Deep Fission, Inc., a Delaware corporation (the " Registrant "),
hereby requests that the above-referenced Registration Statement on Form S-1 (the " Registration Statement ") be declared
effective at 4:01 p.m., Eastern Time, on May 1, 2026, or as soon as practicable thereafter. Once the Registration Statement has been declared
effective, please orally confirm that event with our counsel, Orrick, Herrington & Sutcliffe LLP, by calling Albert Vanderlaan at
(617) 880-2219.

 The Registrant hereby authorizes
Albert Vanderlaan of Orrick, Herrington & Sutcliffe LLP to orally modify or withdraw this request for acceleration.

 Thank you for your assistance
in this matter.

 Kind regards,

 DEEP FISSION, INC.

 By:
 /s/ William (Mark) Schmitz

 Name:
 William (Mark) Schmitz

 Title:
 Chief Financial Officer

 cc: Albert Vanderlaan, Orrick, Herrington & Sutcliffe LLP