---
schema_version: "secwatch.filing_event.v1"
accession: "0001297184-24-000051"
form_type: "8-K"
ticker: "AMPH"
cik: "0001297184"
company_name: "Amphastar Pharmaceuticals, Inc."
filed_at: "2024-08-30T23:59:59+00:00"
generated_at: "2026-05-31T06:46:12.387009+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.45
calibrated_materiality_score: 0.45
confidence: "high"
source: SEC EDGAR
---

# Amphastar subsidiary enters exclusive Primatene MIST distribution deal for Greater China; est. $10M over 10 yrs

## Summary
- Armstrong (Amphastar subsidiary) appoints Genreach as exclusive distributor for Primatene MIST in Mainland China, Taiwan, Hong Kong, Macau; 10-year term.
- Estimated total revenue to Amphastar over 10 years is ~$10 million, subject to currency exchange adjustments.
- Genreach is responsible for obtaining all regulatory approvals in the region.
- Related-party transaction: CEO Jack Zhang and Chairman Mary Luo beneficially own majority of Hanxin, Genreach's parent.
- Minimum purchase amounts per contract year; profit sharing based on Genreach's per unit net revenue.

## SEC filing metadata
- accession: 0001297184-24-000051
- form_type: 8-K
- ticker: AMPH
- cik: 0001297184
- company_name: Amphastar Pharmaceuticals, Inc.
- filed_at: 2024-08-30T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.45
- calibrated_materiality_score: 0.45
- confidence: high
- sec_items: 1.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1297184/000129718424000051/0001297184-24-000051-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1297184/000129718424000051/amph-20240828x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001297184-24-000051
- JSON: https://secwatch.observer/filing/0001297184-24-000051.json
- Plain text: https://secwatch.observer/filing/0001297184-24-000051.txt

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