How many institutions held FISN - DEEP FISSION, INC. - Common Stock, par value $0.0001 per share in Q2 2026?

9 institutional investors reported FISN - DEEP FISSION, INC. - Common Stock, par value $0.0001 per share for Q2 2026. Use the holders table for investor-level position and value details.

DEEP FISSION, INC. - Common Stock, par value $0.0001 per share (FISN)

Q: What does CUSIP 243927100 represent in this 13F holders report?

CUSIP 243927100 is the security identifier for FISN - DEEP FISSION, INC. - Common Stock, par value $0.0001 per share used to aggregate holder disclosures.

CUSIP: 243927100

Q2 2026 13F Holders as of 30 Jun 2026

Security type / class: Equity / Common Stock, par value $0.0001 per share
Total 13F shares: 444,261
Total 13F value: $4,904,122
Share change: +444,261
SEC-reported price per share: $11.04
Number of holders: 9
Value change: +$4,904,122
Number of buys: 9
Shares outstanding: 56,398,804

Security key

243927100

Report period

Q2 2026

Institutions

Top holders

FISN full security history Ownership snapshot Full 13F holder table DEEP FISSION, INC. SEC filings DEEP FISSION, INC. company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Reporting periods

Holder history for CUSIP 243927100

Recent filing periods:

Q2 2026

Ownership snapshot

Top reported holders of FISN - DEEP FISSION, INC. - Common Stock, par value $0.0001 per share (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

Elizabeth Muller

Disclosed value leader

Mark Wayne Peres

Comparable rows

4/9

Latest evidence

31 Mar 2026

3/4/5 13D/G Lead comparable stake: 21% 5 rows are not safely comparable across share classes. 13D/G row: Elizabeth Muller Showing 1-6 of 9 holder rows.

Quick read

Elizabeth Muller leads the comparable SEC ownership view at 21%.

4 of 9 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens Elizabeth Muller's linked filing trail.

Comparable ownership Top 4

Elizabeth Muller 21%

Richard Muller 11%

Mark N. Tompkins 5.6%

EE Holdings Ltd 5.5%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-6 of 9 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
Elizabeth Muller	3/4/5 13D/G Chief Executive Officer · Muller Elizabeth 3/4/5 13D/G	21% from 13D/G	— 15,948,881 shares mixed-class rows	—	09 Mar 2026
Richard Muller	3/4/5 13D/G Chief Technology Officer · Muller Richard 3/4/5 13D/G	11% from 13D/G	— 6,068,789 shares mixed-class rows	—	09 Mar 2026
Mark N. Tompkins	13D/G 3/4/5 The reporting person is a former director and former 10% owner in the Issuer. 13D/G 3/4/5	5.6%	— 3,158,333 shares	$0	31 Mar 2026
EE Holdings Ltd	13D/G EE HOLDINGS LIMITED 13D/G	5.5%	— 2,866,667 shares	$0	30 Sep 2025
Mark Wayne Peres	3/4/5 Chief Nuclear Officer 3/4/5	— mixed-class rows	$956,141 374,607 shares mixed-class rows	—	09 Mar 2026
Michael Allen Brasel	3/4/5 Chief Operating Officer 3/4/5	— class O/S missing	— 530,000 shares	—	09 Mar 2026

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q2 2026

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

444,261

Rows available

Investor	Option	Weight %	Change %	SEC-reported value	* Price	Shares	Share Change	Activity	Report Period

^* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.

Compare Q2 2026 vs Q1 2026 Across Filers

Q1 2026 holders

Q2 2026 holders

Holder diff

Investor	Q1 2026 Shares	Q2 2026 Shares	Share Diff	Share Chg %	Q1 2026 value	Q2 2026 value	Value change	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend