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John Cox Insider Profile

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John Cox, CEO & President, Director at Dyne Therapeutics, holds 429.51K shares in Dyne Therapeutics (Ticker: DYN), holds 0.00 shares in Sigilon Therapeutics (Ticker: SGTX), holds 923.00 shares in Repligen (Ticker: RGEN).
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John Cox

John Cox
Dyne Therapeutics (DYN)
CEO & President, Director

Ranked #103,887 out of 109,349 Corporate Insiders

Profitable Transactions

17%
1 out of 6 Profitable Transactions

Average Return

-58.20%
Average return per transaction
Time Frame
1 Year
Compare to
No Benchmark
How are Insiders Ranked?

Insider Holdings

$15M
51.35%
47.56%
1.08%
A breakdown of John Cox's holdings
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Insider Roles

Biogen
(BIIB)
EVP Pharmaceutical Oper & Tech
Dyne Therapeutics
(DYN)
CEO & President, Director
Repligen
(RGEN)
Director
Roles that John Cox holds in companies
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Most Profitable Insider Trade

Stock:
Dyne Therapeutics
(DYN)
Rating:Informative Buy
Date:Jul 15, 2025 - Jul 15, 2026
Return:+189.70%
The most profitable trade made by John Cox
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John Cox's Trading History

Company Name
Last Transaction Date
Insider Position
Last Transaction
Last Transaction Amount
Holding Value
DYN
Dyne Therapeutics
Sep 08, 2026
CEO & President, Director
Uninformative Sell
106.82K
$7.17M
BIIB
Biogen
Apr 05, 2016
EVP Pharmaceutical Oper & Tech
Uninformative Buy
―
$7.74M
BIVV
Bioverativ Inc
Mar 08, 2018
―
Uninformative Sell
―
$0.00
SGTX
Sigilon Therapeutics
Aug 11, 2023
―
Uninformative Sell
―
$0.00
RGEN
Repligen
Mar 26, 2020
Director
Informative Sell
179.71K
$163.32K
List of latest transactions for each holding click on a transaction to see John Cox's performance on stock
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John Cox insider profile FAQ

What is the percentage of profitable transactions made by John Cox?
The percentage of profitable transactions made by John Cox is 17%.
    What is the average return per transaction made by John Cox?
    The average return per transaction made by John Cox is -58.20%.
      What stocks does John Cox hold?
      John Cox holds: DYN, BIIB, BIVV, SGTX, RGEN stocks.
        What was John Cox’s latest transaction?
        John Cox latest transaction was an Uninformative Sell of $106.82K.
          What was John Cox's most profitable transaction?
          John Cox’s most profitable transaction was an Informative Buy of DYN stock on July 15, 2025. The return on the trade was 189.70%.
            What is John Cox's role in Dyne Therapeutics?
            John Cox's role in Dyne Therapeutics is CEO & President, 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.