Tue, Oct 28, 2025
Oct 28
31,392 shares @ $39.58
Decreased holdings by -4.20%
152nd largest trade (out of 447)
Large TradeCluster Buy
Trade made by a director
Part of a cluster of 5 transactions by 2 insiders
Unscheduled trade
52% win rate · +5.3% median edge vs SPY (170 trades, 90-day)
Price 108% above 200-day moving average
Small Cap stock — insider trades carry more weight
Recent insider activity at SION
Jun 30ORBIMED ADVISORS LLCSold$5.27mMay 27ORBIMED ADVISORS LLCSold$4.49kMay 11OrbiMed Capital GP VIII LLCSold$8.53mMay 8ORBIMED ADVISORS LLCSold$2.66mMay 7ORBIMED ADVISORS LLCSold$2.17mApr 18ORBIMED ADVISORS LLCSold$131.24kApr 17OrbiMed Capital GP VIII LLCSold$2.34mApr 16OrbiMed Capital GP VIII LLCSold$10.29m