Entity type
Individual
Filer Snapshot
Michael J. O'Sullivan
CIK 0001713777. SEC filing timeline plus parsed ownership intelligence from 13F, 13D/G, and Forms 3/4/5 where available.
Total filings
7
Latest filing
19 Dec 2023
Industry
n/a
Filing-backed research brief
Start with the SEC data that changes for this CIK
Latest signal: Forms 3/4/5 owner position for SNAP. 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
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No recent parsed 13D/G stake row for this CIK.
Browse 13D/GInsider / owner context
SNAP
17 Nov 2025 · $18.15M
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Source: SEC Forms 3/4/5
View Source Filing
4 filed on 19 Dec 2023 for CIK 0001713777.
- Ownership evidence
-
- Filing families stay separate so 13F portfolio value, 13D/G large stakes, and Forms 3/4/5 owner positions are not blended into one misleading total.
- Use the linked research paths below to verify each signal against its original SEC filing.
Owner filing value
$18.47M
Estimated from parsed Forms 3/4/5 when the filing discloses enough data.
Portfolio positions
Top parsed positions across ownership filing types.
SNAP BRK.B - Address
- C/O Berkshire Hathaway Inc., 3555 Farnam Street, Omaha, NE, 68131
SEC ownership signals
1 fact
Identity
1 fact
Filer intelligence
What SEC filings say about Michael J. O'Sullivan
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
- Forms 3/4/5 show insider context for SNAP worth $18.15M.
SEC source mix
Counts show available parsed rows, not one combined ownership total.
Forms 3/4/5 insider context
SNAP
17 Nov 2025 · General Counsel
BRK.B
06 May 2026 · See Remarks
Latest update
What changed recently for Michael J. O'Sullivan
Latest ownership report period: 06 May 2026. Open the source-backed page to inspect the fresh filing or facts context.
Update date
06 May 2026
Page type
Ownership filings
Latest period
06 May 2026
Ownership context was refreshed from SEC Forms 3/4/5 filed on 06 May 2026.
SEC filing record
CIK 0001713777 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
7
First seen
18 Aug 2023
Latest filing
19 Dec 2023
Entity
Individual
Observed form types
4
Latest Filings
Showing the latest 7 of 7 SEC filings for Michael J. O'Sullivan.
4
4 filing
- Filing date
- 19 Dec 2023
- Reporting date
- 15 Dec 2023
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
4
4 filing
- Filing date
- 01 Dec 2023
- Reporting date
- 30 Nov 2023
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
4
4 filing
- Filing date
- 20 Nov 2023
- Reporting date
- 16 Nov 2023
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
4
4 filing
- Filing date
- 02 Nov 2023
- Reporting date
- 31 Oct 2023
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
4
4 filing
- Filing date
- 03 Oct 2023
- Reporting date
- 29 Sep 2023
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
4
4 filing
- Filing date
- 01 Sep 2023
- Reporting date
- 31 Aug 2023
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
4
4 filing
- Filing date
- 18 Aug 2023
- Reporting date
- 16 Aug 2023
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing