---
schema_version: "secwatch.filing_event.v1"
accession: "0001297184-25-000040"
form_type: "8-K"
ticker: "AMPH"
cik: "0001297184"
company_name: "Amphastar Pharmaceuticals, Inc."
filed_at: "2025-07-21T23:59:59+00:00"
generated_at: "2026-05-18T04:57:47.737099+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# Amphastar appoints David Gaugh as Class I director; board size increased to 11

## Summary
- Board increased authorized directors from 10 to 11 and appointed David Gaugh effective July 18, 2025.
- Gaugh will serve until the 2026 annual meeting; no committee assignments at this time.
- Initial compensation: $260,000 aggregate grant date fair value, 50% RSUs and 50% stock options, vesting on first anniversary.
- Board determined Gaugh is independent under Nasdaq listing standards; no reportable transactions or arrangements.

## SEC filing metadata
- accession: 0001297184-25-000040
- form_type: 8-K
- ticker: AMPH
- cik: 0001297184
- company_name: Amphastar Pharmaceuticals, Inc.
- filed_at: 2025-07-21T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1297184/000129718425000040/0001297184-25-000040-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1297184/000129718425000040/amph-20250718x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001297184-25-000040
- JSON: https://secwatch.observer/filing/0001297184-25-000040.json
- Plain text: https://secwatch.observer/filing/0001297184-25-000040.txt

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