---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-027814"
form_type: "8-K"
ticker: "AMPH"
cik: "0001297184"
company_name: "Amphastar Pharmaceuticals, Inc."
filed_at: "2026-03-16T23:59:59+00:00"
generated_at: "2026-05-15T11:26:18.856027+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.45
calibrated_materiality_score: 0.45
confidence: "high"
source: SEC EDGAR
---

# Amphastar Board authorizes $50M increase to share buyback program

## Summary
- Board authorized $50M increase to buyback program on March 12, 2026.
- Program has indefinite duration; primary goal is offsetting dilution from equity compensation.
- Purchases may be via open market, block trades, Rule 10b5-1 plans, or private transactions.
- Timing and number of shares depend on price, regulatory requirements, and other conditions.

## SEC filing metadata
- accession: 0001104659-26-027814
- form_type: 8-K
- ticker: AMPH
- cik: 0001297184
- company_name: Amphastar Pharmaceuticals, Inc.
- filed_at: 2026-03-16T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.45
- calibrated_materiality_score: 0.45
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1297184/000110465926027814/0001104659-26-027814-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1297184/000110465926027814/amph-20260312x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-027814
- JSON: https://secwatch.observer/filing/0001104659-26-027814.json
- Plain text: https://secwatch.observer/filing/0001104659-26-027814.txt

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