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Louise Phanstiel Insider Profile

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Louise Phanstiel, Director at Butterfly Network, holds 691.41K shares in Butterfly Network (Ticker: BFLY), holds 341.65K shares in Myriad Genetics (Ticker: MYGN), holds 26.50K shares in Verastem (Ticker: VSTM). Most recently, Louise Phanstiel Bought ― shares of Butterfly Network on Aug 17, 2026 for an estimated value of $998.78K.
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Louise Phanstiel

Louise Phanstiel
Butterfly Network (BFLY)
Director

Ranked #11,104 out of 109,030 Corporate Insiders

Profitable Transactions

57%
4 out of 7 Profitable Transactions

Average Return

+27.50%
Average return per transaction
Time Frame
1 Year
Compare to
No Benchmark
How are Insiders Ranked?

Insider Holdings

$6M
78.81%
18.17%
3.02%
A breakdown of Louise Phanstiel's holdings
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Insider Roles

Butterfly Network
(BFLY)
Director
Myriad Genetics
(MYGN)
Director
Verastem
(VSTM)
Director
Roles that Louise Phanstiel holds in companies
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Most Profitable Insider Trade

Stock:
Butterfly Network
(BFLY)
Rating:Informative Buy
Date:Dec 17, 2025 - Today
Return:+131.20%
The most profitable trade made by Louise Phanstiel
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Louise Phanstiel's Trading History

Company Name
Last Transaction Date
Insider Position
Last Transaction
Last Transaction Amount
Holding Value
BFLY
Butterfly Network
Aug 17, 2026
Director
Informative Buy
998.78K
$5.07M
MYGN
Myriad Genetics
Jun 05, 2026
Director
Uninformative Buy
―
$1.17M
VSTM
Verastem
Dec 31, 2014
Director
Informative Buy
85.40K
$193.98K
List of latest transactions for each holding click on a transaction to see Louise Phanstiel's performance on stock
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Louise Phanstiel insider profile FAQ

What is the percentage of profitable transactions made by Louise Phanstiel?
The percentage of profitable transactions made by Louise Phanstiel is 57%.
    What is the average return per transaction made by Louise Phanstiel?
    The average return per transaction made by Louise Phanstiel is 27.50%.
      What stocks does Louise Phanstiel hold?
      Louise Phanstiel holds: BFLY, MYGN, VSTM stocks.
        What was Louise Phanstiel’s latest transaction?
        Louise Phanstiel latest transaction was an Informative Buy of $998.78K.
          What was Louise Phanstiel's most profitable transaction?
          Louise Phanstiel’s most profitable transaction was an Informative Buy of BFLY stock on December 17, 2025. The return on the trade was 131.20%.
            What is Louise Phanstiel's role in Butterfly Network?
            Louise Phanstiel's role in Butterfly Network 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.