Ionis Pharmaceuticals is trading 4.02% up at $45.04 on October 9, 2026, alongside a biotech-sector rally; no clear company-specific announcement or catalyst explaining the gain was found. - XBI was up 2.50% during the regular session. - Strong biotech IPO activity is supporting sector sentiment, including TRex Bio and Retension Pharmaceuticals beginning trading on October 9. The available evidence does not establish direct causation.