Thompson Peter A. Insider Trading Activity
Thompson Peter A. has been net-selling over the last 12 months with 0 purchases and 18 sales across 1 company.
SION is the most-traded position with 18 trades. The largest single transaction was a sale of SION for $10.5M on Apr 15, 2026.
Performance Scorecard
Forward stock performance after each transaction by Thompson Peter A.. 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 | — | +11.3% | 94% | 18 |
| 90 days | — | +6.2% | 80% | 15 |
| 120 days | — | +1.9% | 80% | 10 |
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 | Δ OWNED | ROLE | FILING |
|---|---|---|---|---|---|---|---|---|
Jul 7, 2026 | SION | Sell | 85,918 | $44.86 | $3.9M | −3.4% | Director | |
May 11, 2026 | SION | Sell | 184,639 | $46.22 | $8.5M | −6.5% | Director | |
May 8, 2026 | SION | Sell | 59,767 | $44.58 | $2.7M | −2.0% | Director | |
May 7, 2026 | SION | Sell | 48,546 | $44.61 | $2.2M | −1.6% | Director | |
Apr 18, 2026 | SION | Sell | 2,948 | $44.52 | $131K | −0.1% | Director | |
Apr 17, 2026 | SION | Sell | 52,397 | $44.68 | $2.3M | −1.7% | Director | |
Apr 16, 2026 | SION | Sell | 226,906 | $45.34 | $10.3M | −7.0% | Director | |
Apr 15, 2026 | SION | Sell | 235,863 | $44.64 | $10.5M | −6.8% | Director | |
Apr 14, 2026 | SION | Sell | 47,814 | $44.51 | $2.1M | −1.4% | Director | |
Feb 3, 2026 | SION | Sell | 29,063 | $44.58 | $1.3M | −0.8% | Director | |
Feb 2, 2026 | SION | Sell | 1,890 | $44.57 | $84K | −0.1% | Director | |
Dec 24, 2025 Filed 3d late | SION | Sell | 33,356 | $44.55 | $1.5M | −0.9% | Director | |
Dec 19, 2025 | SION | Sell | 875 | $44.49 | $39K | −0.0% | Director | |
Dec 18, 2025 | SION | Sell | 100 | $44.49 | $4K | −0.0% | Director | |
Dec 17, 2025 | SION | Sell | 900 | $44.50 | $40K | −0.0% | Director | |
Nov 26, 2025 | SION | Sell | 1,600 | $44.49 | $71K | −0.0% | Director | |
Nov 25, 2025 | SION | Sell | 11,890 | $44.60 | $530K | −0.3% | Director | |
Nov 24, 2025 | SION | Sell | 94,583 | $44.54 | $4.2M | −2.6% | Director | |
Jun 27, 2025 | CRVS | Sell | 1,176,332 | $4.16 | $4.9M | −14.1% | Director |
Top Companies Traded
Other insiders at Sionna Therapeutics, Inc.
6 other tracked filers at SION.