13F reference period
Q2 2026
Security Snapshot
DEEP FISSION, INC. - Common Stock, par value $0.0001 per share (FISN) Institutional Ownership
CUSIP: 243927100
13F Institutional Holders and Ownership History from Q2 2026 to Q3 2026
Institutions Reporting
21
Shares (Excl. Options)
2.29M
Full value: 2,286,829 · shares · 30 Jun 2026Price
$11.04
The headline uses the Q2 2026 reference period after its reporting deadline. Available reports may still be incomplete or amended. Newer periods in the history table contain incoming reports and may be incomplete.
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- Security type / class
- Equity / Common Stock, par value $0.0001 per share
- Symbol
- FISN on Nasdaq
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 2,286,829
- Total 13F value
- $25,245,937
- Portfolio coverage rank
- 0.01%
- Share change
- +2,286,829
- Value change
- +$25,245,937
- Number of holders
- 21
- Shares outstanding
- 56,398,804
- SEC-reported price per share
- $5.13
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
2 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Filing notes and source
Key facts
- FISN - DEEP FISSION, INC. - Common Stock, par value $0.0001 per share is tracked under CUSIP 243927100.
- 21 institutions reported positions in Q2 2026.
- 4 significant owners is listed from Schedule 13D/13G reporting.
Change
- The headline uses Q2 2026 reported holdings.
- Quarter-over-quarter comparison is unavailable because the immediately preceding quarter is missing.
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 Form 13F
Open SEC evidence
Latest holder context comes from 21 institutions filings for Q2 2026.
Security key
243927100
13F reference period
Q2 2026
13F holders
21
13D/G owners
4
CIK / CUSIP context first
Open Q2 2026 holders
FISN full holder history
DEEP FISSION, INC. SEC filings
DEEP FISSION, INC. company facts
DEEP FISSION, INC. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 243927100:
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 |
As of 30 Jun 2026,
21
institutional investors reported holding
shares of
DEEP FISSION, INC. - Common Stock, par value $0.0001 per share (FISN).
This represents
4.1%
of the company’s total
outstanding shares.
2.29M
Full value: 2,286,829 · shares · 30 Jun 202656.4M
Full value: 56,398,804 · shares · Stored outstanding share countQuarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
2
Headline period
Q2 2026
Rows shown
1-2 of 2