---
schema_version: "secwatch.filing_event.v1"
accession: "0000929638-25-002154"
form_type: "8-K/A"
ticker: "AOSL"
cik: "0001387467"
company_name: "ALPHA & OMEGA SEMICONDUCTOR Ltd"
filed_at: "2025-06-04T23:59:59+00:00"
generated_at: "2026-05-19T23:44:53.481595+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.2
calibrated_materiality_score: 0.2
confidence: "high"
source: SEC EDGAR
---

# AOSL amends 8-K to remove Deloitte consultation details; auditor change stands

## Summary
- Dismissed Baker Tilly as independent auditor effective Nov 19, 2024; appointed Deloitte for FY2025.
- No disagreements or reportable events except material weakness in IT controls (remediated by June 30, 2024).
- Amendment removes disclosure of Deloitte consultation services that was not required under Item 304(a)(2).

## SEC filing metadata
- accession: 0000929638-25-002154
- form_type: 8-K/A
- ticker: AOSL
- cik: 0001387467
- company_name: ALPHA & OMEGA SEMICONDUCTOR Ltd
- filed_at: 2025-06-04T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.2
- calibrated_materiality_score: 0.2
- confidence: high
- sec_items: 4.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1387467/000092963825002154/0000929638-25-002154-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1387467/000092963825002154/a8ka.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000929638-25-002154
- JSON: https://secwatch.observer/filing/0000929638-25-002154.json
- Plain text: https://secwatch.observer/filing/0000929638-25-002154.txt

## Key facts
- Auditor Changes
  ALPHA & OMEGA SEMICONDUCTOR Ltd dismissed Baker Tilly US, LLP as its auditor.
  - Action: dismissal
  - Auditor: Baker Tilly US, LLP
  source text: On November 19, 2024, the Audit Committee of the Board of Directors of Alpha and Omega Semiconductor Limited (the “Company”) approved the dismissal of Baker Tilly US, LLP (“ Baker Tilly”) as the Company’s independent registered public accounting firm, effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1387467/000092963825002154/0000929638-25-002154-index.htm
- Auditor Changes
  ALPHA & OMEGA SEMICONDUCTOR Ltd engaged Deloitte & Touche LLP as its auditor.
  - Action: engagement
  - Auditor: Deloitte & Touche LLP
  source text: Effective as of November 19, 2024, the Audit Committee of the Board of Directors of Alpha and Omega Semiconductor Limited (the “Company”) approved the appointment of Deloitte & Touche LLP (“Deloitte”) to serve as the Company’s independent registered public accounting firm for the fiscal year ending June 30, 2025, subject to Deloitte’s completion of its standard client acceptance procedures.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1387467/000092963825002154/0000929638-25-002154-index.htm

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