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John Cox Insider Profile
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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.
John Cox Biogen (BIIB)EVP Pharmaceutical Oper & Tech
Biogen (BIIB)
EVP Pharmaceutical Oper & Tech
Ranked #99,895 out of 103,225 Corporate Insiders
Profitable Transactions
1 out of 6 Profitable Transactions
Average Return
-81.50%
Average return per transaction
Time Frame
Compare to
Insider Holdings
Insider Roles
Roles that John Cox holds in companies
Most Profitable Insider Trade
The most profitable trade made by John Cox
John Cox's Trading History
Biogen
Apr 05, 2016
EVP Pharmaceutical Oper & Tech
Uninformative Buy
―
$4.05M
Bioverativ Inc
Mar 08, 2018
―
Uninformative Sell
―
$0.00
Sigilon Therapeutics
Aug 11, 2023
―
Uninformative Sell
―
$0.00
Dyne Therapeutics
Jul 15, 2025
CEO & President, Director
Informative Buy
911.00K
$3.77M
Repligen
Mar 26, 2020
Director
Informative Sell
179.71K
$112.76K
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 -81.50%.
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 51.90%.
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?
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