---
schema_version: "secwatch.filing_event.v1"
accession: "0001297184-24-000042"
form_type: "8-K"
ticker: "AMPH"
cik: "0001297184"
company_name: "Amphastar Pharmaceuticals, Inc."
filed_at: "2024-06-04T23:59:59+00:00"
generated_at: "2026-06-01T06:28:13.261152+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "high"
source: SEC EDGAR
---

# Amphastar board authorizes $50M increase to share buyback program to offset dilution

## Summary
- $50M increase to buyback program authorized June 3, 2024; program continues indefinitely.
- Primary goal is to offset dilution from equity compensation programs.
- Purchases may be via open market, block trades, Rule 10b5-1 plans, or negotiated transactions.
- Timing and number of shares repurchased depend on price, corporate and regulatory factors.

## SEC filing metadata
- accession: 0001297184-24-000042
- form_type: 8-K
- ticker: AMPH
- cik: 0001297184
- company_name: Amphastar Pharmaceuticals, Inc.
- filed_at: 2024-06-04T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: high
- sec_items: 5.02, 5.07, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1297184/000129718424000042/0001297184-24-000042-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1297184/000129718424000042/amph-20240603x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001297184-24-000042
- JSON: https://secwatch.observer/filing/0001297184-24-000042.json
- Plain text: https://secwatch.observer/filing/0001297184-24-000042.txt

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