Insider · CIK 0001498428
John Cox
ceopresidentofficerdirector
Files at DYN (Dyne Therapeutics, Inc.). First filing Mar 7, 2025, latest Sep 8, 2026.
Track record
Not enough history
Fewer than three past buys with six months of prices.
Median 6-month excess
-
after past buys, n = 0
Hit rate
-
past buys that beat the index over 6 months
Open-market trades
1 / 6
$911k bought, $340k sold
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
DYN: Dyne Therapeutics, Inc.
DYNOct 9, 2026 · close 16.64
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 30Weak | Dyne Therapeutics, Inc. | $107k 5,658 shares | -2% | - | |
| 26Weak | Dyne Therapeutics, Inc. | $41k 2,732 shares | -1% | +123% from low-37% from high | |
| 27Weak | Dyne Therapeutics, Inc. | $55k 2,662 shares | -1% | +198% from low-31% from high | |
| 26Weak | Dyne Therapeutics, Inc. | $35k 2,640 shares | -1% | +109% from low-61% from high | |
| 67Notable | DYNbuy Dyne Therapeutics, Inc. | $911k 100,000 shares | +70% | +31% from low-76% from high | |
| 27Weak | Dyne Therapeutics, Inc. | $54k 4,060 shares | -3% | +105% from low-62% from high | |
| 27Weak | Dyne Therapeutics, Inc. | $48k 4,061 shares | -3% | - |
Transactions
Every row this insider has filed, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Sep 8, 2026 | DYN Dyne Therapeutics, Inc. | SOpen-market sale Common Stock10b5-1 | -5,658 | $18.88 | $107k | 357,507 | 34 d ago |
| Mar 5, 2026 | DYN Dyne Therapeutics, Inc. | SOpen-market sale Common Stock10b5-1 | -2,732 | $14.90 | $41k | 374,145 | Mar 6, 2026 |
| Feb 12, 2026 | DYN Dyne Therapeutics, Inc. | AGrant or award Common Stock | +180,000 | $0.00 | $0 | 376,877 | Feb 17, 2026 |
| Feb 12, 2026 | DYN Dyne Therapeutics, Inc. | AGrant or award Stock option (right to buy)derivative | +285,000 | $0.00 | $0 | 285,000 | Feb 17, 2026 |
| Dec 5, 2025 | DYN Dyne Therapeutics, Inc. | SOpen-market sale Common Stock10b5-1 | -2,662 | $20.72 | $55k | 196,877 | Dec 5, 2025 |
| Sep 5, 2025 | DYN Dyne Therapeutics, Inc. | SOpen-market sale Common Stock10b5-1 | -2,640 | $13.41 | $35k | 199,539 | Sep 9, 2025 |
| Jul 16, 2025 | DYN Dyne Therapeutics, Inc. | AGrant or award Stock option (right to buy)derivative | +197,285 | $0.00 | $0 | 197,285 | Jul 18, 2025 |
| Jul 14, 2025 | DYN Dyne Therapeutics, Inc. | POpen-market purchase Common Stock | +100,000 | $9.11 | $911k | 242,179 | Jul 15, 2025 |
| Jul 15, 2025 | DYN Dyne Therapeutics, Inc. | GGift Common Stock | -10,000 | $0.00 | $0 | 232,179 | Jul 15, 2025 |
| Jul 15, 2025 | DYN Dyne Therapeutics, Inc. | GGift Common Stock | -10,000 | $0.00 | $0 | 222,179 | Jul 15, 2025 |
| Jul 15, 2025 | DYN Dyne Therapeutics, Inc. | GGift Common Stock | -10,000 | $0.00 | $0 | 212,179 | Jul 15, 2025 |
| Jul 15, 2025 | DYN Dyne Therapeutics, Inc. | GGift Common Stock | -10,000 | $0.00 | $0 | 202,179 | Jul 15, 2025 |
| Jun 5, 2025 | DYN Dyne Therapeutics, Inc. | SOpen-market sale Common Stock10b5-1 | -4,060 | $13.35 | $54k | 142,179 | Jun 6, 2025 |
| Mar 5, 2025 | DYN Dyne Therapeutics, Inc. | SOpen-market sale Common Stock10b5-1 | -4,061 | $11.83 | $48k | 146,239 | Mar 7, 2025 |
| Dec 4, 2024 | DYN Dyne Therapeutics, Inc. | AGrant or award Common Stock | +145,300 | $0.00 | $0 | 150,300 | Dec 6, 2024 |
| Dec 4, 2024 | DYN Dyne Therapeutics, Inc. | AGrant or award Stock option (right to buy)derivative | +232,100 | $0.00 | $0 | 232,100 | Dec 6, 2024 |
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.