Entity type
Individual
Filer Snapshot
Elizabeth Muller
CIK 0002081850. SEC filing timeline plus parsed ownership intelligence from 13F, 13D/G, and Forms 3/4/5 where available.
Total filings
2
Latest filing
23 Sep 2025
Industry
n/a
Filing-backed research brief
Start with the SEC data that changes for this CIK
Latest signal: 13D/G stake for DEEP FISSION, INC.. Each card links back to the PortfolioSavvy page where the filing evidence is closest.
Latest 13F portfolio
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No parsed 13F portfolio row yet.
Browse latest 13FLargest parsed holding
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Populates from the latest parsed 13F information table.
Open holding13D/G large stake
DEEP FISSION, INC.
05 Sep 2025 · 21% ownership
Open 13D/GInsider / owner context
DEEP FISSION, INC.
09 Mar 2026
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Source: SEC Schedule 13D/G
View source filing
SCHEDULE 13D filed on 23 Sep 2025 for CIK 0002081850.
- Parsed SEC ownership signals
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Largest active 13D stakes
Active large-stake positions disclosed in parsed Schedule 13D filings.
DEEP ISOLATION NUCLEAR, INC. DEEP FISSION, INC.How to read these SEC ownership signals
- Read each filing family separately: Form 13F, Schedules 13D/G, and Forms 3/4/5 answer different SEC disclosure questions and should not be blended into one ownership total.
- Use 13F values for visible U.S.-listed equity portfolios, 13D/G rows for large beneficial-owner stakes, and Forms 3/4/5 rows for reporting-owner positions and transactions.
- Open the linked research path when you need the filing, CIK, issuer, CUSIP, date, or source trail behind a value.
- Business address
- 2001 Addison Street, Suite 300, Berkeley, CA, 94704
Ownership signals
CIK-linked ownership evidence from parsed SEC filings.
1 signal
At a glance
Names, identifiers, and filing context for this profile.
1 identity field
Filer intelligence
What SEC filings say about Elizabeth Muller
A compact read of parsed XML filings. 13F, 13D/G, and Forms 3/4/5 are shown separately because they answer different ownership questions.
Quick read
- 2 recent 13D/G stake rows found; top row is DEEP FISSION, INC. at 21% ownership.
- Forms 3/4/5 show insider context for DEEP FISSION, INC..
SEC source mix
Counts show available parsed rows, not one combined ownership total.
13D/G large-stake context
DEEP FISSION, INC.
05 Sep 2025 · Common Stock, $0.0001 par value per share
DEEP ISOLATION NUCLEAR, INC.
23 Jul 2025 · Common Stock, $0.0001 par value
Forms 3/4/5 insider context
DEEP FISSION, INC.
09 Mar 2026 · Chief Executive Officer
Deep Isolation Nuclear, Inc.
19 Nov 2025 · 10% owner
Latest update
What changed recently for Elizabeth Muller
Latest ownership report period: 09 Mar 2026. Open the source-backed page to inspect the fresh filing or facts context.
Update date
10 Mar 2026
Page type
Ownership filings
Latest period
09 Mar 2026
Ownership context was refreshed from SEC Forms 3/4/5 filed on 10 Mar 2026.
SEC filing record
CIK 0002081850 filing coverage
Start with this filing record, then use the linked ownership pages when parsed 13F, 13D/G, Forms 3/4/5, or facts data exists for this CIK.
SEC filings
2
First seen
18 Aug 2025
Latest filing
23 Sep 2025
Entity
Individual
Observed form types
SCHEDULE 13D
CIK-linked evidence first
Latest Filings
Showing the latest 2 of 2 SEC filings for Elizabeth Muller.
SCHEDULE 13D
SCHEDULE 13D filing
- Filing date
- 23 Sep 2025
- Reporting date
- Not listed
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
SCHEDULE 13D
SCHEDULE 13D filing
- Filing date
- 18 Aug 2025
- Reporting date
- Not listed
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing