---
schema_version: "secwatch.filing_event.v1"
accession: "0001387467-22-000071"
form_type: "8-K"
ticker: "AOSL"
cik: "0001387467"
company_name: "ALPHA & OMEGA SEMICONDUCTOR Ltd"
filed_at: "2022-10-11T23:59:59+00:00"
generated_at: "2026-06-23T04:19:13.158891+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.35
calibrated_materiality_score: 0.35
confidence: "high"
source: SEC EDGAR
---

# Alpha and Omega Semiconductor dismisses BDO, appoints Baker Tilly as new auditor

## Summary
- Effective Oct 10, 2022, Audit Committee approved Baker Tilly as independent auditor for FY ending June 30, 2023.
- BDO dismissed on Oct 5, 2022; no adverse opinions or disagreements in prior two fiscal years.
- No consultations with Baker Tilly prior to engagement; no reportable events.
- BDO letter attached as Exhibit 16.1 agreeing with company statements.

## SEC filing metadata
- accession: 0001387467-22-000071
- form_type: 8-K
- ticker: AOSL
- cik: 0001387467
- company_name: ALPHA & OMEGA SEMICONDUCTOR Ltd
- filed_at: 2022-10-11T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.35
- calibrated_materiality_score: 0.35
- confidence: high
- sec_items: 4.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1387467/000138746722000071/0001387467-22-000071-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1387467/000138746722000071/aosl-20221005.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001387467-22-000071
- JSON: https://secwatch.observer/filing/0001387467-22-000071.json
- Plain text: https://secwatch.observer/filing/0001387467-22-000071.txt

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