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John Cox Insider Profile

4 Followers
John Cox, EVP Pharmaceutical Oper & Tech at Biogen, holds 274.18K shares in Dyne Therapeutics (Ticker: DYN), holds 0.00 shares in Sigilon Therapeutics (Ticker: SGTX), holds 923.00 shares in Repligen (Ticker: RGEN). Most recently, John Cox Bought ― shares of Dyne Therapeutics on Jul 15, 2025 for an estimated value of 911.00K.
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John Cox

John Cox
Biogen (BIIB)
EVP Pharmaceutical Oper & Tech

Ranked #99,731 out of 102,830 Corporate Insiders

Profitable Transactions

17%
1 out of 6 Profitable Transactions

Average Return

-87.90%
Average return per transaction
Time Frame
1 Year
Compare to
No Benchmark

Insider Holdings

$7M
55.13%
43.39%
1.48%
A breakdown of John Cox's holdings

Insider Roles

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

Most Profitable Insider Trade

Stock:
Dyne Therapeutics
(DYN)
Rating:Informative Buy
Date:Jul 15, 2025 - Today
Return:+21.30%
The most profitable trade made by John Cox

John Cox's Trading History

Company Name
Last Transaction Date
Insider Position
Last Transaction
Last Transaction Amount
Holding Value
Biogen
Apr 05, 2016
EVP Pharmaceutical Oper & Tech
Uninformative Buy
$3.90M
BIVV
Bioverativ Inc
Mar 08, 2018
Uninformative Sell
$0.00
SGTX
Sigilon Therapeutics
Aug 11, 2023
Uninformative Sell
$0.00
Dyne Therapeutics
Jul 15, 2025
CEO & President, Director
Informative Buy
911.00K
$3.07M
Repligen
Mar 26, 2020
Director
Informative Sell
179.71K
$104.78K
List of latest transactions for each holding click on a transaction to see John Cox's performance on stock

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 -87.90%.
      What stocks does John Cox hold?
      John Cox holds: BIIB, BIVV, SGTX, DYN, RGEN stocks.
        What was John Cox’s latest transaction?
        John Cox latest transaction was an Informative Buy of $911.00K.
          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 21.30%.
            What is John Cox's role in Biogen?
            John Cox's role in Biogen is EVP Pharmaceutical Oper & Tech.
              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.