# EDGAR Filing Document

**Accession Number:** 0001918102
**File Stem:** 0001104659-26-046488
**Filing Date:** 2026-4
**Character Count:** 5806
**Document Hash:** dd2aeb070491555ef268799bc9c30159
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-046488.hdr.sgml**: 20260422

**ACCESSION NUMBER**: 0001104659-26-046488

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 12

**CONFORMED PERIOD OF REPORT**: 20260422

**ITEM INFORMATION**: Regulation FD Disclosure

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260422

**DATE AS OF CHANGE**: 20260422

**FILER**: 

**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:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-56407
- **FILM NUMBER:** 26881672

**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

?xml version='1.0' encoding='ASCII'?

**UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549**

**FORM 8-K**

**CURRENT REPORT**

**Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934**

**Date of Report (Date of earliest event reported): April 22, 2026**

**Deep Fission, Inc.**

(Exact name of registrant as specified in its charter)

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| | | |
|:---|:---|:---|
| **Delaware** | **000-56407** | **87-4265302** |
| (State or other jurisdiction<br> of incorporation) | (Commission File Number) | (IRS Employer<br> Identification No.) |

---

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| | |
|:---|:---|
| **2001 Addison St., Suite 300**<br> **Berkeley, California**<br> (Address of principal executive offices) | **94704**<br> (Zip Code) |

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Registrant's telephone number, including area code: (707) 400-0778

N/A

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

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| |
|:---|
| Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) |
| Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) |
| Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) |
| Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) |

---

Securities registered pursuant to Section 12(b) of the Act: None

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ⌧

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

**Item 7.01 - Regulation FD Disclosure**

On April 22, 2026, Deep Fission, Inc. (the "Company") issued a press release announcing that it has confidentially submitted a draft registration statement on Form S-1 with the Securities and Exchange Commission (the "SEC") relating to a proposed public offering by the Company of its common stock.

A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

The information furnished pursuant to Item 7.01 (including Exhibit 99.1) shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liabilities of that section.

**Item 9.01 Financial Statements and Exhibits**

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| | |
|:---|:---|
| **Exhibit No.** | **Description** |
| [**99.1**](tm2612289d1_ex99-1.htm) | [Press Release issued by Deep Fission, Inc., dated April 22, 2026](tm2612289d1_ex99-1.htm) |
| **104** | Cover Page Interactive Data File (Inline XBRL) |

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**SIGNATURE**

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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| | |
|:---|:---|
|  | **DEEP FISSION, INC.** |
| Date: April 22, 2026 | /s/ JON GORDON |
|  | Jon Gordon |
|  | General Counsel & Secretary |

---

## Exhibit 99.1

**Exhibit 99.1**

**Deep Fission, Inc. Confidentially Submits Draft Registration Statement for Primary Offering**

**Berkeley, CA — April 22, 2026 — Deep Fission, Inc.** ("Deep Fission" or the "Company"), an advanced nuclear energy company developing small modular pressurized water reactors installed one mile underground, announced that it has confidentially submitted a draft registration statement on Form S-1 with the Securities and Exchange Commission (the "SEC") relating to a proposed public offering by the Company of its common stock. The number of shares to be offered and the price range for the proposed offering have not yet been determined and the proposed offering will be subject to market and other conditions.

This press release does not constitute an offer to sell or the solicitation of an offer to buy any securities. Any offers to sell, solicitations or offers to buy, and sales of any securities will be made in accordance with the registration requirements of the Securities Act of 1933, as amended (the "Securities Act"). This announcement is being issued in accordance with Rule 135 under the Securities Act.

###