Skip to main content
FISN logo

FISN · Deep Fission, Inc. · Shareholders & Ownership

Track FISN — free
$1.85 +0.35 (+23.33%) At close · Nov 6
Market Cap
$108.98M
Shares
58.91M
Volume · Nov 6 913.07K Avg daily vol (3M) 436.4K

Every disclosed holder of FISN in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

Who Owns FISN

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions
Holder group Shares % Out
Institutional (13F) 2,883,046 4.89%
Insiders (Forms 3, 4, 5) 8,561,592 14.53%
13D/G-only blocks 2,866,667 4.87%
Remaining 44,598,283 75.71%
Registered funds (N-PORT, not summed) 24,401 0.04%

Shares outstanding: 58,909,588, the issuer's latest cover-page count restated onto today's split basis.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of FISN

# Holder Shares
1
Muller Richard
13D CIK 2081872 · Unknown · Sep 5, 2025
Item 4 purpose: Other
not summed
5,426,406
1.1
Muller Richard
Insider CIK 2081872 · Sep 5, 2025
Chief Technology Officer, issuer-wide
5,196,426
2
Mark N. Tompkins
13G CIK 1455971 · Unknown · Mar 31, 2026
Rule 13d-1(c), passive investor, not summed
3,158,333
2.1
Tompkins Mark N.
Insider CIK 1455971 · Sep 5, 2025
Insider, issuer-wide
1,891,667
3
EE HOLDINGS LIMITED
13G CIK 2088098 · Unknown · Sep 30, 2025
Rule 13d-1(d), exempt investor
2,866,667
4
Blue Owl Capital Holdings LP
13F CIK 1858703 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,333,333
5
Muller Elizabeth
Insider CIK 2081850 · Dec 9, 2025
Chief Executive Officer, issuer-wide
549,451
5.1
Muller Elizabeth
13D CIK 2081850 · Unknown · Sep 5, 2025
Item 4 purpose: Other
not summed
10,541,757
6
EXCHANGE TRADED CONCEPTS, LLC
13F CIK 1457320 · Registered investment adviser · Sep 30, 2026
480,348
7
Elevation Wealth Management LLC
13F CIK 2093518 · Registered investment adviser · Sep 30, 2026
349,336
8
Angell Jonathon
Insider CIK 2080569 · Nov 7, 2025
Director, issuer-wide
324,517
9
Jacobs Ian Seth
Insider CIK 1707297 · Aug 26, 2025
Insider, issuer-wide
275,000
10
UBS Group AG
13F CIK 1610520 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
198,497
11
Goldman Tepper Leslie
Insider CIK 2062355 · Apr 28, 2026
Director, issuer-wide
133,996
12
CONSOLIDATED PRESS INTERNATIONAL HOLDINGS LTD
13F CIK 1260786 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
133,333
13
CITADEL ADVISORS LLC
13F CIK 1423053 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
110,000
14
Schmitz William Mark
Insider CIK 1409378 · Sep 5, 2025
Chief Financial Officer, issuer-wide
103,928
15
Peres Mark Wayne
Insider CIK 2110467 · Feb 19, 2026
Chief Nuclear Officer, issuer-wide
86,607
16
LPL Financial LLC
13F CIK 1403438 · Broker-dealer · Sep 30, 2026
80,112
17
Essential Investment Partners LLC
13F CIK 2145170 · Registered investment adviser · Sep 30, 2026
59,502
18
Harbour Capital Advisors, LLC
13F CIK 1682501 · Registered investment adviser · Sep 30, 2026
25,050
19
CHAPIN DAVIS, INC.
13F CIK 872098 · Unknown · Sep 30, 2026
19,000
20
Fidelity Nasdaq Composite Index Fund
Fund S000055366 · Registered fund · Aug 31, 2026
Fidelity Concord Street Trust, not summed
18,341
21
GEODE CAPITAL MANAGEMENT, LLC
13F CIK 1214717 · Registered investment adviser · Sep 30, 2026
18,341
22
GOLDMAN SACHS GROUP INC
13F CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
17,373
23
TRAPHAGEN INVESTMENT ADVISORS LLC
13F CIK 2023380 · Registered investment adviser · Sep 30, 2026
16,815
24
BHK Investment Advisors, LLC
13F CIK 1710539 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
15,000
25
PRELUDE CAPITAL MANAGEMENT, LLC
13F CIK 1387508 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
14,714
26
ALPS Nautilus SMR Nuclear & Technology ETF
Fund S000101442 · Registered fund · Aug 31, 2026
ALPS ETF TRUST, not summed
6,060
27
MORGAN STANLEY
13F CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
6,050
28
US BANCORP \DE\
13F CIK 36104 · Bank · Sep 30, 2026
2,600
29
FNY Investment Advisers, LLC
13F CIK 1742998 · Unknown · Sep 30, 2026
1,201
30
Parkside Financial Bank & Trust
13F CIK 1455267 · Unknown · Sep 30, 2026
700
31
Clearstead Advisors, LLC
13F CIK 842775 · Registered investment adviser · Sep 30, 2026
500
32
WELLS FARGO & COMPANY/MN
13F CIK 72971 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
335
33
JONES FINANCIAL COMPANIES LLLP
13F CIK 815917 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
300
34
CITIGROUP INC
13F CIK 831001 · Bank · Sep 30, 2026
266
35
NATIONAL BANK OF CANADA /FI/
13F CIK 926171 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
200
36
KELLEHER FINANCIAL ADVISORS
13F CIK 1507971 · Registered investment adviser · Sep 30, 2026
140

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Key facts CIK 1918102 CUSIP 243927100 13F (30d) 14 filings 14 filers Visit website Investor relations