Fri, May 8, 2026
May 8
59,767 shares @ $44.58
Decreased holdings by -2.00%
60th largest trade (out of 311)
Planned (10b5-1)Large Trade
“These securities were sold pursuant to a 10b5-1 plan.”Form 4 footnote
Trade made by a director
Executed under a pre-scheduled Rule 10b5-1 plan
55% win rate · +9.8% median edge vs SPY (197 trades, 90-day)
Price 28% above 200-day moving average
Small Cap stock — insider trades carry more weight
Win rate excludes trades classified as routine (tax, 10b5-1, exercise, gift).
Recent insider activity at SION
Jul 7Orbimed Capital Gp Viii LlcSold$3.85mJul 6Jennifer FitzpatrickSold$446.86kJun 30Orbimed Advisors LlcSold$5.27mMay 27Orbimed Advisors LlcSold$4.49kMay 11Orbimed Advisors LlcSold$8.53mMay 7Orbimed Advisors LlcSold$2.17mApr 18Orbimed Advisors LlcSold$131.24kApr 17Orbimed Capital Gp Viii LlcSold$2.34m