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William John Sibold Insider Profile

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William John Sibold, President & CEO, Director at Madrigal Pharmaceuticals, holds 197.75K shares in Madrigal Pharmaceuticals (Ticker: MDGL), holds 20.00K shares in Avanir Pharmaceuticals (Ticker: AVNR).
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William John Sibold

William John Sibold
Madrigal Pharmaceuticals (MDGL)
President & CEO, Director

Ranked #92,114 out of 109,287 Corporate Insiders

Profitable Transactions

33%
2 out of 6 Profitable Transactions

Average Return

-24.90%
Average return per transaction
Time Frame
1 Year
Compare to
No Benchmark
How are Insiders Ranked?

Insider Holdings

$85M
100.00%
A breakdown of William John Sibold's holdings
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Insider Roles

Madrigal Pharmaceuticals
(MDGL)
President & CEO, Director
Roles that William John Sibold holds in companies
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Most Profitable Insider Trade

Stock:
Madrigal Pharmaceuticals
(MDGL)
Rating:Informative Sell
Date:Sep 11, 2026 - Today
Return:+15.80%
The most profitable trade made by William John Sibold
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William John Sibold's Trading History

Company Name
Last Transaction Date
Insider Position
Last Transaction
Last Transaction Amount
Holding Value
MDGL
Madrigal Pharmaceuticals
Sep 11, 2026
President & CEO, Director
Uninformative Sell
2.83M
$85.23M
AVNR
Avanir Pharmaceuticals
May 05, 2011
―
Uninformative Buy
―
―
List of latest transactions for each holding click on a transaction to see William John Sibold's performance on stock
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William John Sibold insider profile FAQ

What is the percentage of profitable transactions made by William John Sibold?
The percentage of profitable transactions made by William John Sibold is 33%.
    What is the average return per transaction made by William John Sibold?
    The average return per transaction made by William John Sibold is -24.90%.
      What stocks does William John Sibold hold?
      William John Sibold holds: MDGL, AVNR stocks.
        What was William John Sibold’s latest transaction?
        William John Sibold latest transaction was an Uninformative Sell of $2.83M.
          What was William John Sibold's most profitable transaction?
          William John Sibold’s most profitable transaction was an Informative Sell of MDGL stock on September 11, 2026. The return on the trade was 15.80%.
            What is William John Sibold's role in Madrigal Pharmaceuticals?
            William John Sibold's role in Madrigal Pharmaceuticals is President & CEO, 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.