Insider · CIK 0001713777

O'Sullivan Michael J.

CIK 0001713777 Name as filed on the most recent filing

Filed as O'Sullivan Michael J. (104)

144 transaction lines · from 104 filings · filed 2017-11-20 to 2026-08-13 The span is the filing dates this catalog holds, not the entity's full filing history. Absence here is not evidence of absence at the SEC.

How this page attributes a trade

A line appears here when the filing that carries it names this CIK as a reporting owner, not only when the parser picked this CIK as the line's primary owner. That is why a joint filing appears on both owners' pages rather than vanishing from the second one. The catalog never merges two CIKs into one person and never splits one CIK into two: identity here is the SEC's own identifier and nothing else.

01

Issuers this insider has filed against

Ordered by last-seen filing date, newest first. Roles are as filed on the Form 4 and are not normalised.

Fault

This container could not be filled from the store. It is showing nothing because a read failed, not because no insider filed: those are different facts and this catalog will not let one stand in for the other. The last ingest the store recorded was 2026-08-25 05:24 UTC.

No issuer is recorded

The catalog holds no filing linking this CIK to an issuer.

02

Transactions

Every stored Form 4 line naming this reporting owner, newest transaction date first. Each row links to the filing it came from.

144 transactions · Newest transaction date first, id breaking the tie.

Fault

This container could not be filled from the store. It is showing nothing because a read failed, not because no insider filed: those are different facts and this catalog will not let one stand in for the other. The last ingest the store recorded was 2026-08-25 05:24 UTC.

Transactions filed by this insider
Direction Date Code Company Value USD Filing
2026-08-12 P, Open-market purchase Berkshire Hathaway IncBRK.B 3 lines 250,072, acquired Open Form 4 filing 0001193125-26-349574
2026-05-06 P, Open-market purchase Berkshire Hathaway IncBRK.B 2 lines 250,545, acquired Open Form 4 filing 0001193125-26-209661
2025-11-17 S, Open-market sale Snap IncSNAP 591,021, disposed Open Form 4 filing 0001193125-25-288497
2025-10-31 S, Open-market sale Snap IncSNAP 185,623, disposed Open Form 4 filing 0001193125-25-265207
2025-09-30 S, Open-market sale Snap IncSNAP 188,544, disposed Open Form 4 filing 0001193125-25-228816
2025-09-16 S, Open-market sale Snap IncSNAP 108,281, disposed Open Form 4 filing 0001193125-25-207684
2025-08-29 S, Open-market sale Snap IncSNAP 171,857, disposed Open Form 4 filing 0000950170-25-112315
2025-08-18 S, Open-market sale Snap IncSNAP 493,082, disposed Open Form 4 filing 0000950170-25-110514
2025-07-31 S, Open-market sale Snap IncSNAP 229,591, disposed Open Form 4 filing 0000950170-25-102251
2025-06-30 S, Open-market sale Snap IncSNAP 208,978, disposed Open Form 4 filing 0000950170-25-093357
2025-06-16 S, Open-market sale Snap IncSNAP 114,951, disposed Open Form 4 filing 0000950170-25-088028
2025-05-30 S, Open-market sale Snap IncSNAP 195,540, disposed Open Form 4 filing 0000950170-25-081216
2025-05-16 S, Open-market sale Snap IncSNAP 591,695, disposed Open Form 4 filing 0000950170-25-074703
2025-04-30 S, Open-market sale Snap IncSNAP 185,875, disposed Open Form 4 filing 0000950170-25-062173
2025-03-31 S, Open-market sale Snap IncSNAP 206,386, disposed Open Form 4 filing 0000950170-25-049753
2025-03-17 S, Open-market sale Snap IncSNAP 125,216, disposed Open Form 4 filing 0000950170-25-041560
2025-02-28 S, Open-market sale Snap IncSNAP 243,828, disposed Open Form 4 filing 0000950170-25-032668
2025-02-18 S, Open-market sale Snap IncSNAP 749,450, disposed Open Form 4 filing 0000950170-25-024450
2025-01-31 S, Open-market sale Snap IncSNAP 206,903, disposed Open Form 4 filing 0000950170-25-012576
2024-12-31 S, Open-market sale Snap IncSNAP 195,104, disposed Open Form 4 filing 0000950170-25-000611
2024-12-16 S, Open-market sale Snap IncSNAP 651,816, disposed Open Form 4 filing 0000950170-24-138061
2024-11-29 S, Open-market sale Snap IncSNAP 213,932, disposed Open Form 4 filing 0000950170-24-132991
2024-11-18 S, Open-market sale Snap IncSNAP 129,857, disposed Open Form 4 filing 0000950170-24-129436
2024-10-31 S, Open-market sale Snap IncSNAP 221,670, disposed Open Form 4 filing 0000950170-24-121000
2024-09-30 S, Open-market sale Snap IncSNAP 194,623, disposed Open Form 4 filing 0000950170-24-111816
2024-09-16 S, Open-market sale Snap IncSNAP 548,638, disposed Open Form 4 filing 0000950170-24-107929
2024-08-30 S, Open-market sale Snap IncSNAP 167,476, disposed Open Form 4 filing 0000950170-24-103633
2024-08-16 S, Open-market sale Snap IncSNAP 113,933, disposed Open Form 4 filing 0000950170-24-099290
2024-07-31 S, Open-market sale Snap IncSNAP 239,065, disposed Open Form 4 filing 0000950170-24-090210
2024-06-28 S, Open-market sale Snap IncSNAP 298,100, disposed Open Form 4 filing 0000950170-24-080929
2024-06-17 S, Open-market sale Snap IncSNAP 913,811, disposed Open Form 4 filing 0000950170-24-075791
2024-05-31 S, Open-market sale Snap IncSNAP 270,241, disposed Open Form 4 filing 0000950170-24-068974
2024-05-16 S, Open-market sale Snap IncSNAP 201,965, disposed Open Form 4 filing 0000950170-24-062602
2024-04-30 S, Open-market sale Snap IncSNAP 271,802, disposed Open Form 4 filing 0000950170-24-052385
2024-03-28 S, Open-market sale Snap IncSNAP 207,594, disposed Open Form 4 filing 0000950170-24-039627
2024-03-18 S, Open-market sale Snap IncSNAP 655,884, disposed Open Form 4 filing 0000950170-24-034339
2024-02-29 S, Open-market sale Snap IncSNAP 2 lines 200,802, disposed Open Form 4 filing 0000950170-24-025145
2024-01-31 S, Open-market sale Snap IncSNAP 210,044, disposed Open Form 4 filing 0000950170-24-010797
2023-12-15 S, Open-market sale Snap IncSNAP 219,422, disposed Open Form 4 filing 0001209191-23-059247
2023-11-30 S, Open-market sale Snap IncSNAP 179,768, disposed Open Form 4 filing 0001209191-23-057109
2023-11-16 S, Open-market sale Snap IncSNAP 424,621, disposed Open Form 4 filing 0001209191-23-056147
2023-10-31 S, Open-market sale Snap IncSNAP 129,117, disposed Open Form 4 filing 0001209191-23-054223
2023-09-29 S, Open-market sale Snap IncSNAP 113,811, disposed Open Form 4 filing 0001209191-23-051705
2023-08-31 S, Open-market sale Snap IncSNAP 134,285, disposed Open Form 4 filing 0001209191-23-048026
2023-08-16 S, Open-market sale Snap IncSNAP 332,744, disposed Open Form 4 filing 0001209191-23-046649
2023-07-31 S, Open-market sale Snap IncSNAP 145,898, disposed Open Form 4 filing 0001209191-23-044295

This column is intentionally blank

No transaction line is stored for this reporting owner, though the catalog holds filings naming them. That happens when the filings report only holdings or only positions the store does not carry, and when a parse failed; each filing page states its own parse status.

Codes on this page
P, Open-market purchase
Open-market purchase
S, Open-market sale
Open-market sale
Relationships on this page
O, Officer
Officer

Every value is as reported on the Form 4, totalled to the dollar. Share counts, the price per share and the full list of reporting owners are on each filing's own page, which every row here opens. A row marked n lines adds up that many filed lines of one filing, on one day, on one side of the market; a filing whose lines fall across two pages is left as its lines on both, so no total here is ever short.

What this insider's stored lines contain

Exact counts over every stored line for this entity. This is a statement of composition, not a filter: the only filter this page offers is the open-market one above, because that is the only one an index serves today.

  • Open-market purchase 5
  • Open-market sale 139
  • Option exercise 0
  • Grant or award 0
  • Tax withholding 0
  • Disposition to the issuer 0
  • In-the-money option exercise 0

How to cite this page

ebomi catalog. O'Sullivan Michael J., insider transactions. Retrieved 2026-08-25 from https://ebomi.com/insider/0001713777

Balogh, A. Insider trading. Scientific Data 10, 237 (2023) doi:10.1038/s41597-023-02147-6

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