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Michael J. O'Sullivan Insider Profile

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Michael J. O'Sullivan, SVP, GC and Secretary at Berkshire Hathaway A, holds 1.15K shares in Berkshire Hathaway A (Ticker: BRK.A), holds 1.15K shares in Berkshire Hathaway B (Ticker: BRK.B), holds 2.35M shares in Snap (Ticker: SNAP). Most recently, Michael J. O'Sullivan ― shares of Berkshire Hathaway A on ― for an estimated value of ―.
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Michael J. O'Sullivan

Michael J. O'Sullivan
Berkshire Hathaway A (BRK.A)
SVP, GC and Secretary

Ranked #98,099 out of 108,921 Corporate Insiders

Profitable Transactions

58%
25 out of 43 Profitable Transactions

Average Return

-12.60%
Average return per transaction
Time Frame
1 Year
Compare to
No Benchmark
How are Insiders Ranked?

Insider Holdings

$13M
95.66%
4.34%
0.00%
A breakdown of Michael J. O'Sullivan's holdings
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Insider Roles

Snap
(SNAP)
GC
Berkshire Hathaway B
(BRK.B)
SVP, GC and Secretary
Berkshire Hathaway A
(BRK.A)
SVP, GC and Secretary
Roles that Michael J. O'Sullivan holds in companies
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Most Profitable Insider Trade

Stock:
Snap
(SNAP)
Rating:Informative Sell
Date:Aug 18, 2021 - Aug 18, 2022
Return:+82.50%
The most profitable trade made by Michael J. O'Sullivan
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Michael J. O'Sullivan's Trading History

Company Name
Last Transaction Date
Insider Position
Last Transaction
Last Transaction Amount
Holding Value
BRK.A
Berkshire Hathaway A
―
SVP, GC and Secretary
―
―
BRK.B
Berkshire Hathaway B
Aug 13, 2026
SVP, GC and Secretary
Informative Buy
250.07K
$582.44K
SNAP
Snap
Nov 19, 2025
GC
Uninformative Buy
―
$12.83M
List of latest transactions for each holding click on a transaction to see Michael J. O'Sullivan's performance on stock
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Michael J. O'Sullivan insider profile FAQ

What is the percentage of profitable transactions made by Michael J. O'Sullivan?
The percentage of profitable transactions made by Michael J. O'Sullivan is 58%.
    What is the average return per transaction made by Michael J. O'Sullivan?
    The average return per transaction made by Michael J. O'Sullivan is -12.60%.
      What stocks does Michael J. O'Sullivan hold?
      Michael J. O'Sullivan holds: BRK.A, BRK.B, SNAP stocks.
        What was Michael J. O'Sullivan’s latest transaction?
        Michael J. O'Sullivan latest transaction was an Uninformative Buy of ―.
          What was Michael J. O'Sullivan's most profitable transaction?
          Michael J. O'Sullivan’s most profitable transaction was an Informative Sell of SNAP stock on August 18, 2021. The return on the trade was 82.50%.
            What is Michael J. O'Sullivan's role in Berkshire Hathaway A?
            Michael J. O'Sullivan's role in Berkshire Hathaway A is SVP, GC and Secretary.
              How can I follow the stock ratings of top corporate insiders?
              Head over to our Expert Center to see a list of the Top 100 corporate insiders and follow the corporate insiders of your choice. Visit their profiles for more details about their stock transactions and see how they perform on a stock-by-stock basis.