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David R. Brennan Insider Profile

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David R. Brennan, Director at Insmed, holds 99.24K shares in Insmed (Ticker: INSM), holds 0.00 shares in Alexion Pharmaceuticals (Ticker: ALXN). Most recently, David R. Brennan Sold ― shares of Insmed on Sep 11, 2026 for an estimated value of $3.10M.
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David R. Brennan

David R. Brennan
Insmed (INSM)
Director

Ranked #59,450 out of 109,349 Corporate Insiders

Profitable Transactions

67%
2 out of 3 Profitable Transactions

Average Return

-3.50%
Average return per transaction
Time Frame
1 Year
Compare to
No Benchmark
How are Insiders Ranked?

Insider Holdings

$11M
100.00%
A breakdown of David R. Brennan's holdings
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Insider Roles

Insmed
(INSM)
Director
Roles that David R. Brennan holds in companies
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Most Profitable Insider Trade

Stock:
Insmed
(INSM)
Rating:Informative Sell
Date:Sep 11, 2026 - Today
Return:+27.80%
The most profitable trade made by David R. Brennan
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David R. Brennan's Trading History

Company Name
Last Transaction Date
Insider Position
Last Transaction
Last Transaction Amount
Holding Value
INSM
Insmed
Sep 11, 2026
Director
Informative Sell
3.10M
$11.17M
ALXN
Alexion Pharmaceuticals
Jul 23, 2021
―
Uninformative Sell
―
$0.00
List of latest transactions for each holding click on a transaction to see David R. Brennan's performance on stock
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David R. Brennan insider profile FAQ

What is the percentage of profitable transactions made by David R. Brennan?
The percentage of profitable transactions made by David R. Brennan is 67%.
    What is the average return per transaction made by David R. Brennan?
    The average return per transaction made by David R. Brennan is -3.50%.
      What stocks does David R. Brennan hold?
      David R. Brennan holds: INSM, ALXN stocks.
        What was David R. Brennan’s latest transaction?
        David R. Brennan latest transaction was an Informative Sell of $3.10M.
          What was David R. Brennan's most profitable transaction?
          David R. Brennan’s most profitable transaction was an Informative Sell of INSM stock on September 11, 2026. The return on the trade was 27.80%.
            What is David R. Brennan's role in Insmed?
            David R. Brennan's role in Insmed is Director.
              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.