---
schema_version: "secwatch.filing_event.v1"
accession: "0000707549-21-000124"
form_type: "8-K"
ticker: "LRCX"
cik: "0000707549"
company_name: "LAM RESEARCH CORP"
filed_at: "2021-07-28T23:59:59+00:00"
generated_at: "2026-06-30T01:52:12.459684+00:00"
event_type: "earnings"
sentiment: "positive"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Lam Research Q4 FY2021 revenue $4.15B, EPS $7.98; guides Q1 rev ~$4.3B

## Summary
- Revenue $4.15B (+8% QoQ); GAAP diluted EPS $7.98 (+8% QoQ).
- Non-GAAP diluted EPS $8.09, vs $7.49 in prior quarter.
- FY2021 revenue grew >45% YoY, EPS up >70%.
- Q1 FY2022 guidance: revenue $4.3B ± $250M, non-GAAP EPS $8.10 ± $0.50.
- Operating cash flow $1.44B; $617M returned via buybacks and dividends.

## SEC filing metadata
- accession: 0000707549-21-000124
- form_type: 8-K
- ticker: LRCX
- cik: 0000707549
- company_name: LAM RESEARCH CORP
- filed_at: 2021-07-28T23:59:59+00:00
- event_type: earnings
- sentiment: positive
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/707549/000070754921000124/0000707549-21-000124-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/707549/000070754921000124/lrcx-20210728.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000707549-21-000124
- JSON: https://secwatch.observer/filing/0000707549-21-000124.json
- Plain text: https://secwatch.observer/filing/0000707549-21-000124.txt

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