# EDGAR Filing Document

**Accession Number:** 0001918102
**File Stem:** 0000000000-26-001819
**Filing Date:** 2026-2
**Character Count:** 2279
**Document Hash:** a0bbcf736a66c24f603204688d6cc3b6
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000000000-26-001819.hdr.sgml**: 20260601

**ACCESSION NUMBER**: 0000000000-26-001819

**CONFORMED SUBMISSION TYPE**: UPLOAD

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260223

**FILED FOR**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** DEEP FISSION, INC.
- **CENTRAL INDEX KEY:** 0001918102
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC SERVICES [4911]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 874265302
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** UPLOAD
- **SEC FILE NUMBER:** 333-293510

**BUSINESS ADDRESS:**
- **STREET 1:** 2831 GARBER STREET
- **CITY:** BERKELEY
- **STATE:** CA
- **ZIP:** 94705
- **BUSINESS PHONE:** (707) 400-0778

**MAIL ADDRESS:**
- **STREET 1:** 2831 GARBER STREET
- **CITY:** BERKELEY
- **STATE:** CA
- **ZIP:** 94705

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Surfside Acquisition Inc.
- **DATE OF NAME CHANGE:** 20220317
**PUBLIC REFERENCE ACCESSION NUMBER**: 0001104659-26-016226

## Text-Extract

```

                                                           February 23, 2026

Elizabeth Muller
President and Chief Executive Officer
DEEP FISSION, INC.
2001 Addison Street
Suite 300
Berkeley, California 94704

       Re: DEEP FISSION, INC.
           Registration Statement on Form S-1
           Filed February 17, 2026
           File No. 333-293510
Dear Elizabeth Muller:

       This is to advise you that we have not reviewed and will not review your
registration
statement.

        Please refer to Rules 460 and 461 regarding requests for acceleration.
We remind you
that the company and its management are responsible for the accuracy and
adequacy of their
disclosures, notwithstanding any review, comments, action or absence of action
by the staff.

       Please contact Kevin Dougherty at 202-551-3271 with any questions.

                                                           Sincerely,

                                                           Division of
Corporation Finance
                                                           Office of Energy &
Transportation
cc:    Albert Vanderlaan

```

### Attached PDF Documents

**Attachment 1:** `filename1`

_No text found in this document._