OrbiMed Advisors LLC Insider Trading Activity
OrbiMed Advisors LLC, an institutional filer, recorded 31 transactions over the last 12 months across 6 companies totaling $77.5M.
Activity concentrated in SION with 18 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% | -207.9% | 71% | 34 |
| 90 days | +229.6% | -269.5% | 58% | 31 |
| 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 | 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 21, 2026 | PRLD | Buy | 1,689,189 | $4.44 | $7.5M | +16.7% | Director | |
Apr 21, 2026 | PRLD | Buy | 1,126,126 | $4.44 | $5.0M | — | 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 ⚠ Filed 8d late | TRAW | Buy | 597,729 | $1.67 | $998K | +98.7% | 10%+ Owner | |
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 | |
Apr 8, 2026 | ACET | Sell | 40,416 | $6.52 | $264K | −100.0% | 10%+ Owner | |
Apr 8, 2026 | ACET | Sell | 32,523 | $6.29 | $205K | −100.0% | 10%+ Owner | |
Apr 7, 2026 | ACET | Sell | 2,400 | $6.38 | $15K | −6.9% | 10%+ Owner | |
Apr 7, 2026 | ACET | Sell | 29,319 | $6.53 | $191K | −45.6% | 10%+ Owner | |
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 | |
Oct 23, 2025 | PMVP | Sell | 1,000,000 | $1.52 | $1.5M | −16.7% | 10%+ Owner | |
Oct 8, 2025 | ACET | Buy | 3,500,000 | $1.00 | $3.5M | +353.4% | 10%+ Owner | |
Oct 8, 2025 | ACET | Buy | 1,500,000 | $1.00 | $1.5M | +19.9% | 10%+ Owner | |
Sep 10, 2025 | PMVP | Sell | 500,000 | $1.80 | $900K | −7.7% | 10%+ Owner | |
Aug 25, 2025 ⚠ Filed 6d late | STTK | Buy | 1,051,021 | $0.87 | $912K | — | Director | |
Aug 25, 2025 ⚠ Filed 6d late | STTK | Buy | 5,255,106 | $0.87 | $4.6M | — | Director | |
Jun 27, 2025 | CRVS | Sell | 1,176,332 | $4.16 | $4.9M | −14.1% | Director | |
Jun 26, 2025 | PASG | Sell | 213,257 | $0.33 | $70K | −3.4% | 10%+ Owner | |
Jun 25, 2025 | PASG | Sell | 138,800 | $0.33 | $46K | −2.2% | 10%+ Owner | |
Jun 24, 2025 | PASG | Sell | 231,600 | $0.35 | $81K | −3.5% | 10%+ Owner |
Top Companies Traded
Other insiders at Sionna Therapeutics, Inc.
6 other tracked filers at SION.