---
schema_version: "secwatch.filing_event.v1"
accession: "0001157523-21-001037"
form_type: "8-K"
ticker: "AOSL"
cik: "0001387467"
company_name: "ALPHA & OMEGA SEMICONDUCTOR Ltd"
filed_at: "2021-08-11T23:59:59+00:00"
generated_at: "2026-06-29T14:51:27.512342+00:00"
event_type: "earnings"
sentiment: "positive"
materiality_score: 0.8
calibrated_materiality_score: 0.8
confidence: "high"
source: SEC EDGAR
---

# AOSL reports Q4 FY2021 revenue $177.3M, up 45% YoY; GAAP EPS $0.71

## Summary
- Fiscal Q4 revenue $177.3M, up 45% from $122.4M YoY; GAAP diluted EPS $0.71 vs ($0.00).
- GAAP gross margin improved to 34.2% from 23.6% YoY; non-GAAP gross margin 34.9%.
- GAAP operating income $22.4M vs loss of $1.3M last year; non-GAAP net income $26.3M.
- Non-GAAP diluted EPS $0.95 vs $0.29 in Q4 FY2020, reflecting strong operational leverage.

## SEC filing metadata
- accession: 0001157523-21-001037
- form_type: 8-K
- ticker: AOSL
- cik: 0001387467
- company_name: ALPHA & OMEGA SEMICONDUCTOR Ltd
- filed_at: 2021-08-11T23:59:59+00:00
- event_type: earnings
- sentiment: positive
- materiality_score: 0.8
- calibrated_materiality_score: 0.8
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1387467/000115752321001037/0001157523-21-001037-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1387467/000115752321001037/a52474977.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001157523-21-001037
- JSON: https://secwatch.observer/filing/0001157523-21-001037.json
- Plain text: https://secwatch.observer/filing/0001157523-21-001037.txt

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