John Cox bought $911k of DYN
CEO & President at Dyne Therapeutics, Inc.. 100,000 shares at an average of $9.11, traded Jul 14, 2025, filed Jul 15, 2025.
Score components
- +25RoleCEO
- +24Trade size$911k at market
- +10Relative to holdingsHoldings up 70%
- +8Price context76% below the 52-week high
- 0ClusterNo other insider buying within 14 days
- 0Repeat buyingFirst buy in 90 days
- 0Track recordToo few past buys to judge (0 with prices)
What happened after comparable buys
Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.
This signal so far: 1m +51.0%, 3m +86.6%, 6m +105.8%.
Price around the trade, and since
From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™
Rows in this filing
Every transaction in Form 4 0000950170-25-095929, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Jul 14, 2025 | POpen-market purchase Common Stock | +100,000 | $9.11 | $911k | 242,179 | Jul 15, 2025 |
| Jul 15, 2025 | GGift Common Stock | -10,000 | $0.00 | $0 | 232,179 | Jul 15, 2025 |
| Jul 15, 2025 | GGift Common Stock | -10,000 | $0.00 | $0 | 222,179 | Jul 15, 2025 |
| Jul 15, 2025 | GGift Common Stock | -10,000 | $0.00 | $0 | 212,179 | Jul 15, 2025 |
| Jul 15, 2025 | GGift Common Stock | -10,000 | $0.00 | $0 | 202,179 | Jul 15, 2025 |
Related signals
Other insiders at Dyne Therapeutics, Inc. and this insider’s other filings.
| Score | Company | Insider | Value | Holdings | Filed |
|---|---|---|---|---|---|
| 32Weak | DYNbuy Dyne Therapeutics, Inc. | Brian S Posner director | $40k 2,500 shares | +10% | |
| 30Weak | Dyne Therapeutics, Inc. | John Cox CEO & President | $107k 5,658 shares | -2% | |
| 20Weak | Dyne Therapeutics, Inc. | Douglas Kerr Chief Medical Officer | $116k 5,035 shares | -3% | |
| 15Weak | Dyne Therapeutics, Inc. | Johanna Friedl-Naderer Chief Commercial Officer | $25k 1,085 shares | -1% | |
| 31Weak | Dyne Therapeutics, Inc. | John Cox CEO & President | $131k 4,986 shares | -1% | |
| 55Moderate | Dyne Therapeutics, Inc. | Jason P Rhodes director | $65M 2,586,928 shares | -64% | |
| 23Weak | Dyne Therapeutics, Inc. | Erick Lucera Chief Financial Officer | $47k 1,797 shares | -1% | |
| 16Weak | Dyne Therapeutics, Inc. | Douglas Kerr Chief Medical Officer | $41k 1,556 shares | -1% | |
| 10Weak | Dyne Therapeutics, Inc. | Johanna Friedl-Naderer Chief Commercial Officer | $5,939 226 shares | -0% | |
| 20Weak | Dyne Therapeutics, Inc. | Dirk Kersten director | $6.7M 261,460 shares | -7% |
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.