Deep Fission director granted 16,973 RSUs

Angell Jonathon reported acquisition or exercise transactions in this Form 4 filing.

Accepted by SEC EDGAR 07/27/2026 - 05:00 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Angell Jonathon reported acquisition or exercise transactions in this Form 4 filing.

DEEP FISSION, INC. director Jonathon Angell received an equity compensation grant of 16,973 restricted stock units on July 23, 2026. Each unit represents a contingent right to receive one share of common stock and vests on July 20, 2027, provided he continues to provide service through that date. Following the award, he directly holds 16,973 restricted stock units linked to the issuer's common stock.

Insider Trade Summary

Grant/Award: 16,973 shares

Grant/Award 1 txn

Insider Angell Jonathon

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Unit F1	16,973	$0.00	$0.00

Holdings After Transaction: Restricted Stock Unit — 16,973 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: 16,973 units Underlying common shares: 16,973 shares Grant price per unit: $0.0000 per share +2 more

5 metrics

Restricted stock units granted 16,973 units Equity award to director on 2026-07-23

Underlying common shares 16,973 shares Each RSU represents one share of common stock

Grant price per unit $0.0000 per share Equity compensation grant with no cash purchase price

Holdings after transaction 16,973 RSUs Total restricted stock units directly held by the director after the award

Vesting date July 20, 2027 Date on which all granted RSUs are scheduled to vest, subject to service

Key Terms

Restricted Stock Unit, contingent right, vesting

3 terms

Restricted Stock Unit financial

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

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

"represents a contingent right to receive one share of the Issuer's common stock"

vesting financial

"The units vest on July 20, 2027, provided the holder continues to provide 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 Jonathon Angell report for DEEP FISSION (FISN)?

Jonathon Angell reported receiving 16,973 restricted stock units as an equity grant. The award is dated July 23, 2026 and is held directly, representing potential DEEP FISSION common shares if the units vest in 2027 as scheduled.

How many restricted stock units did the DEEP FISSION (FISN) director receive and when do they vest?

He received 16,973 restricted stock units that vest on July 20, 2027. Vesting is conditioned on his continued service through that date, at which time each unit can settle into one share of common stock.

What does each restricted stock unit represent for DEEP FISSION (FISN)?

Each restricted stock unit represents a contingent right to one share of DEEP FISSION common stock. The units convert into shares only upon vesting, aligning the director’s compensation with future company performance and continued service.

Were the DEEP FISSION (FISN) restricted stock units granted at a cash purchase price?

No cash purchase price was paid; the units were granted at $0.0000 per unit as equity compensation. Value for the director comes from future delivery of common shares if the vesting conditions are satisfied.

Does the DEEP FISSION (FISN) report indicate use of a Rule 10b5-1 trading plan?

The report’s Rule 10b5-1 checkbox is not marked as affirmative. This indicates the grant was not classified as being made pursuant to a Rule 10b5-1 trading plan, but rather as a standard equity compensation award.

What are Jonathon Angell’s holdings in DEEP FISSION (FISN) from this award after the reported transaction?

After the transaction, he directly holds 16,973 restricted stock units tied to DEEP FISSION common stock. These units remain unvested until July 20, 2027, and may convert into the same number of common shares at vesting.

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^*

Angell Jonathon

(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		16,973		(1)	(1)	Common Stock	16,973	$0	16,973	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 Jonathon Angell	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)