OrbiMed Advisors LLC Insider Trading Activity
OrbiMed Advisors LLC, an institutional filer, recorded 34 transactions over the last 12 months across 8 companies totaling $78.7M.
Activity concentrated in SION with 17 filings. 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 OrbiMed Advisors LLC. 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 | +312.7% | -216.9% | 70% | 33 |
| 90 days | +421.2% | -421.0% | 79% | 19 |
| 120 days | +404.7% | -424.9% | 74% | 19 |
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 11, 2026 | SION | Sell | 184,639 | $46.22 | $8.5M | Director |
| May 8, 2026 | SION | Sell | 59,767 | $44.58 | $2.7M | Director |
| May 7, 2026 | SION | Sell | 48,546 | $44.61 | $2.2M | Director |
| Apr 21, 2026 | PRLD | Buy | 1,689,189 | $4.44 | $7.5M | Director |
| Apr 21, 2026 | PRLD | Buy | 1,126,126 | $4.44 | $5.0M | Director |
| Apr 18, 2026 | SION | Sell | 2,948 | $44.52 | $131K | Director |
| Apr 17, 2026 | SION | Sell | 52,397 | $44.68 | $2.3M | Director |
| Apr 16, 2026 | SION | Sell | 226,906 | $45.34 | $10.3M | Director |
| Apr 16, 2026 | TRAW | Buy | 597,729 | $1.67 | $998K | 10%+ Owner |
| Apr 15, 2026 | SION | Sell | 235,863 | $44.64 | $10.5M | Director |
| Apr 14, 2026 | SION | Sell | 47,814 | $44.51 | $2.1M | Director |
| Apr 8, 2026 | ACET | Sell | 32,523 | $6.29 | $205K | 10%+ Owner |
| Apr 8, 2026 | ACET | Sell | 40,416 | $6.52 | $264K | 10%+ Owner |
| Apr 7, 2026 | ACET | Sell | 29,319 | $6.53 | $191K | 10%+ Owner |
| Apr 7, 2026 | ACET | Sell | 2,400 | $6.38 | $15K | 10%+ Owner |
| Feb 3, 2026 | SION | Sell | 29,063 | $44.58 | $1.3M | Director |
| Feb 2, 2026 | SION | Sell | 1,890 | $44.57 | $84K | Director |
| Dec 24, 2025 | SION | Sell | 33,356 | $44.55 | $1.5M | Director |
| Dec 19, 2025 | SION | Sell | 875 | $44.49 | $39K | Director |
| Dec 18, 2025 | SION | Sell | 100 | $44.49 | $4K | Director |
| Dec 17, 2025 | SION | Sell | 900 | $44.50 | $40K | Director |
| Nov 26, 2025 | SION | Sell | 1,600 | $44.49 | $71K | Director |
| Nov 25, 2025 | SION | Sell | 11,890 | $44.60 | $530K | Director |
| Nov 24, 2025 | SION | Sell | 94,583 | $44.54 | $4.2M | Director |
| Oct 23, 2025 | PMVP | Sell | 1,000,000 | $1.52 | $1.5M | 10%+ Owner |
| Oct 8, 2025 | ACET | Buy | 3,500,000 | $1.00 | $3.5M | 10%+ Owner |
| Oct 8, 2025 | ACET | Buy | 1,500,000 | $1.00 | $1.5M | 10%+ Owner |
| Sep 10, 2025 | PMVP | Sell | 500,000 | $1.80 | $900K | 10%+ Owner |
| Aug 25, 2025 | STTK | Buy | 5,255,106 | $0.87 | $4.6M | Director |
| Aug 25, 2025 | STTK | Buy | 1,051,021 | $0.87 | $912K | Director |
| Jun 27, 2025 | CRVS | Sell | 1,176,332 | $4.16 | $4.9M | Director |
| Jun 26, 2025 | PASG | Sell | 213,257 | $0.33 | $70K | 10%+ Owner |
| Jun 25, 2025 | PASG | Sell | 138,800 | $0.33 | $46K | 10%+ Owner |
| Jun 24, 2025 | PASG | Sell | 231,600 | $0.35 | $81K | 10%+ Owner |
Top Companies Traded
Other insiders at Sionna Therapeutics, Inc.
6 other tracked filers at SION.