- Corporate Officers - C
- Cox John
Insider Trading History of Cox John
The following table details the insider trading activities
(stock purchases, stock sales, and stock option exercises) of Cox John since 2015.
This trader's CIK number is 1498428.
At the time of last reporting, Cox John was the CEO & President of Dyne Therapeutics, Inc.. (stock ticker symbol DYN).
Also see all insider trading activities at Dyne Therapeutics, Inc..
Note that in the past
Cox John also reported insider trading activities as an insider of the following companies:
Yearly summary of insider trading at Repligen Corp (RGEN) by Cox John
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2020 | RGEN | 0 | $0 | 43,049 | $4,104,846 | 36,736 | $990,266 |
Yearly summary of insider trading at Biogen Inc. (BIIB) by Cox John
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2016 | BIIB | 0 | $0 | 0 | $0 | 4,026 | $0 |
| 2015 | BIIB | 0 | $0 | 12,010 | $5,393,210 | 17,518 | $337,978 |
Yearly summary of insider trading at Dyne Therapeutics, Inc. (DYN) by Cox John
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2025 | DYN | 100,000 | $911,000 | 4,061 | $48,041 | 0 | $0 |
| 2024 | DYN | 32,000 | $1,050,560 | 0 | $0 | 0 | $0 |
Yearly summary of insider trading at Bioverativ Inc. (BIVV) by Cox John
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2018 | BIVV | 0 | $0 | 0 | $0 | 42,720 | $175,170 |
Insider trading activities at 4 companies by Cox John:
1. Repligen Corp (RGEN)
2. Biogen Inc. (BIIB)
3. Dyne Therapeutics, Inc. (DYN)
4. Bioverativ Inc. (BIVV)
Table 1. Insider trading of Repligen Corp (RGEN) by Cox John
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2020-03-24 | RGEN | Sale | 1,858 | 96.72 | 179,705 |
| 2020-03-18 | RGEN | Option Ex | 26,736 | 32.21 | 861,166 |
| 2020-03-18 | RGEN | Sale | 26,736 | 96.25 | 2,573,340 |
| 2020-03-04 | RGEN | Option Ex | 10,000 | 12.91 | 129,100 |
| 2020-03-04 | RGEN | Sale | 10,000 | 93.39 | 933,900 |
| 2020-02-24 | RGEN | Sale | 4,455 | 93.81 | 417,901 |
Table 2. Insider trading of Biogen Inc. (BIIB) by Cox John
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2016-02-08 | BIIB | Option Ex | 4,026 | .00 | 0 |
| 2015-03-25 | BIIB | Option Ex | 5,066 | 66.72 | 337,978 |
| 2015-03-25 | BIIB | Sale | 12,010 | 449.06 | 5,393,210 |
| 2015-02-12 | BIIB | Option Ex | 3,738 | .00 | 0 |
| 2015-02-08 | BIIB | Option Ex | 4,023 | .00 | 0 |
| 2015-02-09 | BIIB | Option Ex | 4,691 | .00 | 0 |
Table 3. Insider trading of Dyne Therapeutics, Inc. (DYN) by Cox John
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2025-07-14 | DYN | Buy | 100,000 | 9.11 | 911,000 |
| 2025-03-05 | DYN | Sale | 4,061 | 11.83 | 48,041 |
| 2024-09-04 | DYN | Buy | 32,000 | 32.83 | 1,050,560 |
Table 4. Insider trading of Bioverativ Inc. (BIVV) by Cox John
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2018-02-14 | BIVV | Option Ex | 24,339 | .00 | 0 |
| 2018-02-11 | BIVV | Option Ex | 18,381 | 9.53 | 175,170 |
Insider trading activities including stock purchases, stock sales, and option exercises
listed in the above table cannot be completely guaranteed as to their accuracy.
For more information regarding the trades made by Cox John
(CEO & President of Dyne Therapeutics, Inc. at the time of this reporting) see
the Securities and Exchange Commission (SEC) website.