Cox John
CEO & President
Cox John has filed 8 SEC Form 4 filings (8 transaction rows) across 1 company, with disclosures dating back to 2025. 7 of those filings fall inside the rolling window. Most recent filing: Sep 8, 2026.
On the most recent filing, Cox John is listed as CEO & President at Dyne Therapeutics, Inc. Inside the rolling window, Cox John reported no open-market purchases and 6 open-market sales totaling $444K in DYN. The largest disclosed transaction in the window is a sale of 4,986 DYN shares on Aug 13, 2026, worth $131K.
Companies traded
Other insiders at DYN
Insider Buying
$0
reported purchases (SEC code P)
Insider Selling
$444K
reported sales (SEC code S)
Companies
1
in the rolling window
Earlier trades
Open-market purchases and sales filed before the rolling 365-day window, kept from the original Form 4 filings.
| Date | Ticker | Type | Value |
|---|---|---|---|
| Sep 5, 2025 | DYN | Sale | $35K |
Frequently asked questions
How many SEC Form 4 filings has Cox John made?
Cox John has filed 8 SEC Form 4 filings (8 transaction rows) across 1 company since 2025.
Which companies does Cox John trade?
Cox John has filed SEC Form 4 disclosures for 1 company, including DYN.
When was Cox John's most recent SEC Form 4 filing?
Cox John's most recent SEC Form 4 filing on Tracefour is dated Sep 8, 2026.
What is Cox John's job title?
On the most recent SEC Form 4 filings tracked by Tracefour, Cox John is listed as CEO & President.
What is Cox John's total buy and sell value in the current window?
Inside the rolling retention window, Cox John bought $0 and sold $444K based on SEC Form 4 filings.
What was Cox John's largest disclosed transaction?
The largest disclosed transaction in the current window is a sale of 4,986 DYN shares on 2026-08-13, worth $131K, per SEC Form 4 filings.