![Michael O'Sullivan](data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%231b1b1b" class="bi bi-person-fill" viewBox="0 0 16 16"><path d="M3 14s-1 0-1-1 1-4 6-4 6 3 6 4-1 1-1 1zm5-6a3 3 0 1 0 0-6 3 3 0 0 0 0 6"/></svg>)
Michael O'Sullivan
General Counsel at
BERKSHIRE HATHAWAY INC.
Net worth: 11 M $ as of 2026-06-29
Profile
Michael J.
O'Sullivan is currently Principal at Munger, Tolles & Olson LLP and General Counsel & Senior Vice President at Berkshire Hathaway, Inc. Formerly, Mr. O'Sullivan was Secretary & General Counsel at Snap, Inc. from 2017 to 2025.
Education includes an undergraduate degree from the University of Pennsylvania in 1987 and a graduate degree from the University of Southern California Gould School of Law.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
SNAP, INC. CLASS A 0.17% | 2025-12-30 | 2,345,436 ( 0.17% ) | 10 M $ | 2026-06-29 |
| 2026-05-05 | 663 ( 0% ) | 331 759 $ | 2026-06-29 |
Michael O'Sullivan active positions
| Companies | Position | Start |
|---|---|---|
| BERKSHIRE HATHAWAY INC. | General Counsel | 2025-12-31 |
Munger, Tolles & Olson LLP
 Munger, Tolles & Olson LLP Miscellaneous Commercial ServicesCommercial Services Provides legal services | Corporate Officer/Principal | - |
Former positions of Michael O'Sullivan
| Companies | Position | End |
|---|---|---|
| SNAP INC. | General Counsel | 2025-12-30 |
Training of Michael O'Sullivan
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
97
1st degree connections
5
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 5 |
|---|---|
Berkshire Hathaway, Inc.
 Berkshire Hathaway, Inc. Property/Casualty InsuranceFinance Operates as a holding company which offers insurance, rail transportation and energy generation & distribution services | Finance |
Munger, Tolles & Olson LLP
Munger, Tolles & Olson LLP Miscellaneous Commercial ServicesCommercial Services Provides legal services | Commercial Services |
University of Pennsylvania
 University of Pennsylvania Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Snap, Inc.
 Snap, Inc. Packaged SoftwareTechnology Services Develops text and photo based messaging application for mobile phones | Technology Services |
University of Southern California Gould School of Law
 University of Southern California Gould School of Law Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
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