Institutional HoldersBeta

Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

DEEP FISSION, INC.

CIK 0001918102FISN· quarter ending 2026-06-30

Shares outstanding

58,905,938

as of 2026-07-27 · 10-Q cover page, filed 2026-08-03

Held by 13F filers

2,286,829

3.9% of shares outstanding

Holders

+22 vs 2026-03-31 · 22 new, 0 exited

Value

$25.2M

shares +— vs prior quarter

Share classes (cover page of the 10-Q filed 2026-08-03, as of 2026-07-27)

Class	Listed	Shares outstanding	Held by 13F filers	% of class	Holders	CUSIP
Common stock	FISN · NASDAQ	58,905,938	2,286,829	3.9%	22	243927100

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine

Count	CUSIP	Class (as filers write it)	Holders	Shares held	Class shares	% of class	Value	Options	Mapped via
	243927100	COM	22	2,286,829	58,905,938	3.9%	$25.2M	—	13DG	holders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings.

Top holders (22 of 22 · 243927100)

change vs 2026-03-31

#	Filer	Shares	% of class	Value	Change
1	Blue Owl Capital Holdings LP	1,333,333	2.26%	$14.7M	NEW
2	Elevation Wealth Management LLC	298,335	0.51%	$3.3M	NEW
3	UBS Group AG	198,497	0.34%	$2.2M	NEW
4	CONSOLIDATED PRESS INTERNATIONAL HOLDINGS LTD	133,333	0.23%	$1.5M	NEW
5	CITADEL ADVISORS LLC	110,000	0.19%	$1.2M	NEW
6	LPL Financial LLC	70,858	0.12%	$782K	NEW
7	GEODE CAPITAL MANAGEMENT, LLC	27,333	0.05%	$302K	NEW
8	Essential Investment Partners LLC	26,400	0.04%	$291K	NEW
9	CHAPIN DAVIS, INC.	19,000	0.03%	$210K	NEW
10	GOLDMAN SACHS GROUP INC	17,373	0.03%	$192K	NEW
11	BHK Investment Advisors, LLC	15,000	0.03%	$166K	NEW
12	PRELUDE CAPITAL MANAGEMENT, LLC	14,714	0.02%	$162K	NEW
13	TRAPHAGEN INVESTMENT ADVISORS LLC	13,666	0.02%	$151K	NEW
14	MORGAN STANLEY	6,050	0.01%	$67K	NEW
15	US BANCORP \DE\	1,100	0.00%	$12K	NEW
16	FNY Investment Advisers, LLC	500	0.00%	$5K	NEW
17	Clearstead Advisors, LLC	500	0.00%	$6K	NEW
18	WELLS FARGO & COMPANY/MN	335	0.00%	$4K	NEW
19	JONES FINANCIAL COMPANIES LLLP	300	0.00%	$3K	NEW
20	NATIONAL BANK OF CANADA /FI/	200	0.00%	$2K	NEW
21	CITIGROUP INC	2	0.00%	$22	NEW
22	Keating Financial Advisory Services, Inc.	0	0.00%	$0	NEW

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting person	Form	Filed	Event	Shares	% of class
Mark N.Tompkins	SCHEDULE 13G/A	2026-05-15	2026-03-31	3,158,333	5.6%
Mark N. Tompkins	SCHEDULE 13G/A	2025-11-14	2025-09-30	2,958,333	5.82%
EDWARD EISLER	SCHEDULE 13G	2025-11-03	2025-09-30	2,866,667	5.5%
EE HOLDINGS LIMITED	SCHEDULE 13G	2025-11-03	2025-09-30	2,866,667	5.5%
Muller Elizabeth	SCHEDULE 13D	2025-09-23	2025-09-05	10,541,757	20.6%
Muller Richard	SCHEDULE 13D	2025-09-23	2025-09-05	5,426,406	10.6%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.