Deep Fission director granted 19,204 RSUs

Goldman Tepper Leslie reported acquisition or exercise transactions in this Form 4 filing.

Accepted by SEC EDGAR 07/27/2026 - 05:01 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Goldman Tepper Leslie reported acquisition or exercise transactions in this Form 4 filing.

DEEP FISSION, INC. director Goldman Tepper Leslie received a grant of 19,204 restricted stock units on July 23, 2026. Each unit represents a right to receive one share of common stock and vests on July 20, 2027, subject to continued service, resulting in direct holdings of 19,204 units.

Insider Trade Summary

Grant/Award: 19,204 shares

Grant/Award 1 txn

Insider Goldman Tepper Leslie

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Unit F1	19,204	$0.00	$0.00

Holdings After Transaction: Restricted Stock Unit — 19,204 contracts (Direct)

Footnotes (1)

1. F1. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock upon vesting. The units vest on July 20, 2027, provided the holder continues to provide service through the vesting date.

Key Figures

Restricted stock units granted: 19,204 units Underlying common shares: 19,204 shares Grant price per unit: $0.0000 per unit +2 more

5 metrics

Restricted stock units granted 19,204 units Grant of restricted stock units on July 23, 2026

Underlying common shares 19,204 shares Each restricted stock unit represents one share of common stock

Grant price per unit $0.0000 per unit Reported transaction price per restricted stock unit

RSUs following transaction 19,204 units Total restricted stock units directly held after the award

RSU vesting date July 20, 2027 Units vest if service continues through the vesting date

Key Terms

Restricted Stock Unit, contingent right, vesting

3 terms

Restricted Stock Unit financial

"Security titled "Restricted Stock Unit" reported as a derivative award."

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

contingent right financial

"Each restricted stock unit represents a contingent right to receive one share."

vesting financial

"The units vest on July 20, 2027, provided the holder continues service."

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did FISN director Goldman Tepper Leslie report?

Goldman Tepper Leslie reported a grant of 19,204 restricted stock units in Deep Fission, Inc. Each unit represents a right to receive one share of common stock, vesting on July 20, 2027, if the director continues to provide service.

How many shares could the new RSUs for FISN convert into?

The 19,204 restricted stock units could convert into 19,204 shares of common stock. The footnote states that each restricted stock unit represents a contingent right to receive one share of Deep Fission’s common stock upon vesting.

When do Goldman Tepper Leslie’s RSUs in FISN vest?

The restricted stock units are scheduled to vest on July 20, 2027. Vesting requires that the holder continues to provide service to Deep Fission, Inc. through that vesting date before shares of common stock are delivered.

What is the reported price per restricted stock unit in the FISN Form 4?

The Form 4 reports a transaction price of $0.0000 per restricted stock unit. This reflects that the RSUs were granted as an award rather than purchased in an open-market transaction, consistent with the grant/award transaction code A.

What is Goldman Tepper Leslie’s direct RSU holding in FISN after this grant?

After the reported transaction, Goldman Tepper Leslie directly holds 19,204 restricted stock units. This post-transaction amount matches the number of units granted, indicating the award established this RSU position as reported in the filing.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Goldman Tepper Leslie

(Last) (First) (Middle)

C/O DEEP FISSION, INC.

2001 ADDISON ST., SUITE 300

(Street)

BERKELEY CALIFORNIA 94704

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
DEEP FISSION, INC. [ FISN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/23/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Unit	$0	07/23/2026		A		19,204		(1)	(1)	Common Stock	19,204	$0	19,204	D

Explanation of Responses:

1. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock upon vesting. The units vest on July 20, 2027, provided the holder continues to provide service through the vesting date.

	/s/ Jon Gordon, as Attorney-in-Fact for Leslie Goldman Tepper	07/27/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)