---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-21-090711"
form_type: "8-K"
ticker: "HRGN"
cik: "0001563665"
company_name: "Harvard Apparatus Regenerative Technology, Inc."
filed_at: "2021-07-09T23:59:59+00:00"
generated_at: "2026-06-30T06:22:22.491836+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Biostage replaces auditor RSM with Wei, Wei & Co. effective July 6, 2021

## Summary
- RSM US LLP notified Biostage on May 25, 2021 that client-auditor relationship ceased.
- Audit Committee engaged Wei, Wei & Co., LLP as new independent auditor on July 6, contingent on client acceptance.
- No consultations with Wei on accounting principles or disagreements/reportable events occurred.

## SEC filing metadata
- accession: 0001104659-21-090711
- form_type: 8-K
- ticker: HRGN
- cik: 0001563665
- company_name: Harvard Apparatus Regenerative Technology, Inc.
- filed_at: 2021-07-09T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 4.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1563665/000110465921090711/0001104659-21-090711-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1563665/000110465921090711/tm2121907d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-21-090711
- JSON: https://secwatch.observer/filing/0001104659-21-090711.json
- Plain text: https://secwatch.observer/filing/0001104659-21-090711.txt

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