secwatch.observer — SEC 8-K summary
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Issuer:     ARROWHEAD PHARMACEUTICALS, INC. (ARWR)
CIK:        0000879407
Form:       8-K
Filed at:   2025-09-12T23:59:59+00:00
Accession:  0000879407-25-000010
Event type: litigation
Sentiment:  negative
Materiality: 0.82
Item codes: 8.01, 9.01
LLM model:  deepseek-v4-flash:cloud@v2

Ionis sues Arrowhead for patent infringement over plozasiran, threatening FCS launch
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- Ionis filed complaint in Central District of California alleging Arrowhead's plozasiran infringes U.S. Patent No. 9,593,333.
- Arrowhead had preemptively sought declaratory judgment in Delaware to invalidate the same patent on Sept. 10, 2025.
- Arrowhead expects FDA decision on plozasiran NDA by Nov. 18, 2025 (PDUFA) and plans Q4 2025 launch.
- The '333 patent covers method of reducing triglycerides in adults with familial chylomicronemia syndrome (FCS).
- Ionis says it sent a pre-suit notice on Sept. 3, 2025; Arrowhead did not engage before filing DJ action.

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/879407/000087940725000010/0000879407-25-000010-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/879407/000087940725000010/arwr-20250911.htm
  HTML page:      https://secwatch.observer/filing/0000879407-25-000010

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