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William Scully Insider Profile

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William Scully, Ten Percent Owner at Yield10 Bioscience, holds 1.19M shares in Prothena (Ticker: PRTA), holds 3.17M shares in Yield10 Bioscience (Ticker: YTENQ). Most recently, William Scully Bought ― shares of Prothena on Jun 12, 2026 for an estimated value of $1.02M.
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William Scully

William Scully
Yield10 Bioscience (YTENQ)
Ten Percent Owner

Ranked #103,146 out of 107,911 Corporate Insiders

Profitable Transactions

21%
3 out of 14 Profitable Transactions

Average Return

-39.30%
Average return per transaction
Time Frame
1 Year
Compare to
No Benchmark
How are Insiders Ranked?

Insider Holdings

$10M
99.52%
0.48%
A breakdown of William Scully's holdings
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Insider Roles

Prothena
(PRTA)
Ten Percent Owner
Yield10 Bioscience
(YTENQ)
Ten Percent Owner
Roles that William Scully holds in companies
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Most Profitable Insider Trade

Stock:
Prothena
(PRTA)
Rating:Informative Buy
Date:May 02, 2025 - May 02, 2026
Return:+25.10%
The most profitable trade made by William Scully
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William Scully's Trading History

Company Name
Last Transaction Date
Insider Position
Last Transaction
Last Transaction Amount
Holding Value
YTENQ
Yield10 Bioscience
Sep 14, 2016
Ten Percent Owner
Informative Sell
22.10K
$47.51K
PRTA
Prothena
Jun 12, 2026
Ten Percent Owner
Informative Buy
1.02M
$9.84M
List of latest transactions for each holding click on a transaction to see William Scully's performance on stock
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William Scully insider profile FAQ

What is the percentage of profitable transactions made by William Scully?
The percentage of profitable transactions made by William Scully is 21%.
    What is the average return per transaction made by William Scully?
    The average return per transaction made by William Scully is -39.30%.
      What stocks does William Scully hold?
      William Scully holds: YTENQ, PRTA stocks.
        What was William Scully’s latest transaction?
        William Scully latest transaction was an Informative Buy of $1.02M.
          What was William Scully's most profitable transaction?
          William Scully’s most profitable transaction was an Informative Buy of PRTA stock on May 2, 2025. The return on the trade was 25.10%.
            What is William Scully's role in Yield10 Bioscience?
            William Scully's role in Yield10 Bioscience is Ten Percent Owner.
              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.