---
schema_version: "secwatch.filing_event.v1"
accession: "0001297184-23-000007"
form_type: "8-K"
ticker: "AMPH"
cik: "0001297184"
company_name: "Amphastar Pharmaceuticals, Inc."
filed_at: "2023-02-24T23:59:59+00:00"
generated_at: "2026-06-19T00:34:23.377520+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.1
calibrated_materiality_score: 0.1
confidence: "high"
source: SEC EDGAR
---

# Amphastar Pharmaceuticals amends bylaws to update director nomination procedures and adopt forum selection clause

## Summary
- Board approved Amended and Restated Bylaws on Feb 23, 2023.
- New requirement for stockholders to deliver evidence of compliance with Rule 14a-19 no later than five business days before meeting.
- Adopted forum selection provision for claims under the Securities Act of 1933.
- Updated provisions on directors, committees, officers, and conformed to Delaware General Corporation Law.

## SEC filing metadata
- accession: 0001297184-23-000007
- form_type: 8-K
- ticker: AMPH
- cik: 0001297184
- company_name: Amphastar Pharmaceuticals, Inc.
- filed_at: 2023-02-24T23:59:59+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.1
- calibrated_materiality_score: 0.1
- confidence: high
- sec_items: 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1297184/000129718423000007/0001297184-23-000007-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1297184/000129718423000007/amph-20230223x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001297184-23-000007
- JSON: https://secwatch.observer/filing/0001297184-23-000007.json
- Plain text: https://secwatch.observer/filing/0001297184-23-000007.txt

## Key facts
- Governance Changes
  Amphastar Pharmaceuticals, Inc.: Approved Amended and Restated Bylaws revising director nomination and stockholder proposal procedures, stockholder meeting procedures, director/committee/officer provisions, and adding a forum selection clause (effective 2023-02-23).
  - Change: bylaw amendment
  - Effective: 2023-02-23
  source text: On February 23, 2023, the Board of Directors (the “Board”) of Amphastar Pharmaceuticals, Inc. (the “Company”) approved the Company’s Amended and Restated Bylaws (the “Amended and Restated Bylaws”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1297184/000129718423000007/0001297184-23-000007-index.htm

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