Cox John Insider Trading Activity
Cox John has been net-selling over the last 12 months with 0 purchases and 4 sales across 1 company.
DYN is the most-traded position with 4 trades. The largest single transaction was a sale of DYN for $61K on May 13, 2026.
Performance Scorecard
Forward stock performance after each transaction by Cox John. Buy returns measure price movement after open-market purchases; sell-avoided measures the loss avoided after open-market sales. Success rate counts trades where the insider's direction was right.
| PERIOD | AVG BUY RETURN | AVG SELL AVOIDED | SUCCESS RATE | TRADES |
|---|---|---|---|---|
| 30 days | +34.4% | +6.8% | 83% | 6 |
| 90 days | +54.0% | -12.3% | 40% | 5 |
| 120 days | +115.9% | -18.9% | 60% | 5 |
Performance based on stock price movement after each transaction date. Past results do not predict future returns. Not financial advice.
Price & Trades
Pro: Trade MarkersDYN ยท Dyne Therapeutics, Inc.
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| DATE | TICKER | TYPE | SHARES | PRICE | VALUE | ฮ OWNED | ROLE | FILING |
|---|---|---|---|---|---|---|---|---|
May 13, 2026 | DYN | Sell | 3,311 | $18.36 | $61K | โ0.9% | CEO | |
Mar 5, 2026 | DYN | Sell | 2,732 | $14.90 | $41K | โ0.7% | CEO | |
Dec 5, 2025 | DYN | Sell | 2,662 | $20.72 | $55K | โ1.3% | CEO | |
Sep 5, 2025 | DYN | Sell | 2,640 | $13.41 | $35K | โ1.3% | CEO | |
Jul 14, 2025 | DYN | Buy | 100,000 | $9.11 | $911K | +70.3% | CEO | |
Jun 5, 2025 | DYN | Sell | 4,060 | $13.35 | $54K | โ2.8% | CEO |
Top Companies Traded
| TICKER | COMPANY | TRADES | TOTAL VOLUME |
|---|---|---|---|
| DYN | Dyne Therapeutics, Inc. | 6 | $1.2M |
Other insiders at Dyne Therapeutics, Inc.
5 other tracked filers at DYN.