Why Ionis Pharmaceuticals, Inc. (IONS) stock fell 21.4% on Monday, November 9, 2026

Ionis Pharmaceuticals, Inc. (IONS) closed at $31, down 21.36% on Monday, November 9, 2026, on volume of 19,489,434 shares (6.1× its 3-month average); market value about $5.20B.

What happened: primary sources

Events Nexqual found for IONS on Monday, November 9, 2026 or the trading day before (November 6, 2026):

• Nov 9, 2026: Reported quarterly results (SEC 8-K) for the quarter ended Sep 30, 2026: EPS −$0.40 vs consensus −$0.93 (beat), on the analysts' basis (usually adjusted, not GAAP). source
• Nov 9, 2026: SEC 10-Q: Quarterly report, period ended Sep 30, 2026 source

These are listed as context. A filing or rating change on the same day is not proof that it caused the move; read the source.

More on IONS

IONS stock page: price, SEC financials, insider trades, superinvestor holders, analyst estimates and options. Other big moves that day: November 9, 2026.

Sources: SEC EDGAR, Nexqual Earnings Flash, analyst rating changes, Nexqual market data. Built November 10, 2026 at 16:24 UTC. Not investment advice.

Data source: Nexqual. Last updated: November 10, 2026 at 16:24 UTC. This page is informational and not investment advice.

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