---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-217063"
form_type: "8-K"
ticker: "VNDA"
cik: "0001347178"
company_name: "Vanda Pharmaceuticals Inc."
filed_at: "2023-08-21T23:59:59+00:00"
generated_at: "2026-06-11T06:01:51.538218+00:00"
event_type: "litigation"
sentiment: "negative"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Vanda's petition for rehearing on patent invalidation denied by Federal Circuit

## Summary
- Federal Circuit denied Vanda's rehearing petition on August 16, 2023, affirming invalidity of four patents.
- Patents RE46,604; 9,730,910; 10,149,829; and 10,376,487 held invalid by District Court decision.
- Federal Circuit originally affirmed invalidation on May 10, 2023; Vanda sought rehearing on June 9, 2023.

## SEC filing metadata
- accession: 0001193125-23-217063
- form_type: 8-K
- ticker: VNDA
- cik: 0001347178
- company_name: Vanda Pharmaceuticals Inc.
- filed_at: 2023-08-21T23:59:59+00:00
- event_type: litigation
- sentiment: negative
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1347178/000119312523217063/0001193125-23-217063-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1347178/000119312523217063/d544298d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-217063
- JSON: https://secwatch.observer/filing/0001193125-23-217063.json
- Plain text: https://secwatch.observer/filing/0001193125-23-217063.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.