Security Snapshot

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

CUSIP: 243927100

13F Institutional Holders and Ownership History for Q2 2026

Latest Period

n/a

Institutions Reporting

Shares (Excl. Options)

Price

$11.11

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Security type / class
Equity / Common Stock, par value $0.0001 per share
Symbol
FISN on Nasdaq
Shares outstanding
56,398,804
SEC-reported price per share
$11.11
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors

Key facts

  • FISN - DEEP FISSION, INC. - Common Stock, par value $0.0001 per share is tracked under CUSIP 243927100.
  • Latest finished 13F holder period is not available.
  • 4 significant owners is listed from Schedule 13D/13G reporting.

Change

  • Latest quarter on this page is Q2 2026.
  • Additional quarter-over-quarter change detail appears as history expands.

Research use

  • You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
  • 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.

Evidence

Source: SEC Schedule 13D/G

Ownership context comes from Schedule 13D/G and available holder history for this CUSIP.

Open SEC evidence

Security key

243927100

Latest holder period

n/a

13F holders

13D/G owners

4

CIK / CUSIP context first

FISN full holder history DEEP FISSION, INC. SEC filings DEEP FISSION, INC. company facts DEEP FISSION, INC. insider transactions

Broader feeds

Latest 13F filings Latest 13D/G filings All securities

13D/G owners

Significant owners

Large-stake holder rows connected to Schedule 13D/G evidence.

Rows
4
Security
FISN
Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
Muller Elizabeth 21% 10,541,757 Muller Elizabeth 05 Sep 2025
Muller Richard 11% 5,426,406 Muller Richard 05 Sep 2025
Tompkins Mark N. 5.6% -3.7% 3,158,333 +6.8% Mark N.Tompkins 31 Mar 2026
EE Holdings Ltd 5.5% 2,866,667 EE HOLDINGS LIMITED 30 Sep 2025

Quarter history

Institutional holders across reporting periods

Holder count, reported shares/value, and median price by quarter.

Periods
1
Latest
n/a
Rows shown
1-1 of 1
Period 13F Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2026 Q2 372,901 $4,116,308 +$4,116,308 $11.04 6
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