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 | +111.8% | -460.7% | 60% | 5 |
| 90 days | +211.0% | — | 100% | 2 |
| 120 days | +437.3% | — | 100% | 1 |
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 | ROLE |
|---|---|---|---|---|---|---|
| May 20, 2026 | DYN | Buy | 2,500 | $17.12 | $43K | Director |
| May 11, 2026 | ACGL | Sell | 2,000 | $17.14 | $34K | Director |
| Mar 30, 2026 | DYN | Buy | 2,000 | $17.08 | $34K | Director |
| Mar 11, 2026 | DYN | Buy | 2,000 | $19.35 | $39K | Director |
| Mar 11, 2026 | ACGL | Sell | 3,000 | $17.11 | $51K | Director |
| Mar 6, 2026 | DYN | Buy | 3,000 | $15.06 | $45K | Director |
| Aug 1, 2025 | ACGL | Buy | 1,000 | $17.34 | $17K | Director |
Top Companies Traded
Other insiders at Dyne Therapeutics, Inc.
5 other tracked filers at DYN.