Posner Brian S Insider Trading Activity
Posner Brian S has been net-buying over the last 12 months with 5 purchases and 2 sales across 2 different companies.
DYN is the most-traded position with 4 trades. The largest single transaction was a sale of ACGL for $51K on Mar 11, 2026.
Performance Scorecard
Forward stock performance after each transaction by Posner Brian S. 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 | +93.8% | -446.7% | 57% | 7 |
| 90 days | +109.8% | -428.3% | 60% | 5 |
| 120 days | +171.5% | -494.2% | 75% | 4 |
Performance based on stock price movement after each transaction date. Past results do not predict future returns. Not financial advice.
Price & Trades
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| DATE | TICKER | TYPE | SHARES | PRICE | VALUE | ฮ OWNED | ROLE | FILING |
|---|---|---|---|---|---|---|---|---|
May 20, 2026 | DYN | Buy | 2,500 | $17.12 | $43K | +16.1% | Director | |
May 11, 2026 | ACGL | Sell | 2,000 | $17.14 | $34K | โ100.0% | Director | |
Mar 30, 2026 | DYN | Buy | 2,000 | $17.08 | $34K | +14.8% | Director | |
Mar 11, 2026 | DYN | Buy | 2,000 | $19.35 | $39K | +17.4% | Director | |
Mar 11, 2026 | ACGL | Sell | 3,000 | $17.11 | $51K | โ60.0% | Director | |
Mar 6, 2026 | DYN | Buy | 3,000 | $15.06 | $45K | +35.3% | Director | |
Aug 1, 2025 | ACGL | Buy | 1,000 | $17.34 | $17K | +25.0% | Director |
Top Companies Traded
Other insiders at Dyne Therapeutics, Inc.
5 other tracked filers at DYN.