---
schema_version: "secwatch.filing_event.v1"
accession: "0001437749-23-029394"
form_type: "8-K"
ticker: "MPWR"
cik: "0001280452"
company_name: "MONOLITHIC POWER SYSTEMS INC"
filed_at: "2023-10-30T23:59:59+00:00"
generated_at: "2026-06-09T05:39:21.248821+00:00"
event_type: "earnings"
sentiment: "neutral"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# MPS Q3 GAAP EPS $2.48, non-GAAP $3.08; revenue $474.9M, down 4% YoY; new $640M buyback

## Summary
- Revenue $474.9M, up 7.6% QoQ, down 4.1% YoY; GAAP net income $121.2M ($2.48 diluted EPS).
- Non-GAAP net income $150.3M ($3.08 diluted EPS) vs $170.7M ($3.53) YoY; GAAP gross margin 55.5% down from 58.7%.
- Q4 guidance: revenue $442M-$462M, GAAP gross margin 55.2%-55.8%, stock-based comp ~$33M.
- Board authorized $640M stock repurchase program expiring Oct 29, 2026; shares retired.
- Revenue by end market: Storage/Computing $129.5M, Auto $95.2M, Consumer $62.4M.

## SEC filing metadata
- accession: 0001437749-23-029394
- form_type: 8-K
- ticker: MPWR
- cik: 0001280452
- company_name: MONOLITHIC POWER SYSTEMS INC
- filed_at: 2023-10-30T23:59:59+00:00
- event_type: earnings
- sentiment: neutral
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 2.02, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1280452/000143774923029394/0001437749-23-029394-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1280452/000143774923029394/mpwr20231026_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001437749-23-029394
- JSON: https://secwatch.observer/filing/0001437749-23-029394.json
- Plain text: https://secwatch.observer/filing/0001437749-23-029394.txt

## Key facts
- Earnings Releases
  MONOLITHIC POWER SYSTEMS INC reported the nine months ended September 30, 2023 results: revenue $1,367.1 million.
  - Period: the nine months ended September 30, 2023
  - Revenue: $1,367.1 million
  - Result: reported results
  source text: deferred compensation plan expense and $3.2 million for related tax effects. The financial results for the nine months ended September 30, 2023 were as follows: ● Revenue was $1,367.1 million for the nine months ended September 30, 2023, a 2.5% increase from $1,334.1 million for the nine months ended September 30, 2022. ● GAAP gross margin was 56.3% for the nine
  evidence_url: https://www.sec.gov/Archives/edgar/data/1280452/000143774923029394/0001437749-23-029394-index.htm
- Earnings Releases
  MONOLITHIC POWER SYSTEMS INC reported the quarter ended September 30, 2023 results: revenue $474.9 million, net income $121.2 million and $2.48 per diluted share, EPS $2.48 per diluted share.
  - Period: the quarter ended September 30, 2023
  - Revenue: $474.9 million
  - Net income: $121.2 million and $2.48 per diluted share
  - EPS: $2.48 per diluted share
  - Result: reported results
  source text: financial results for the quarter and nine months ended September 30, 2023. The financial results for the quarter ended September 30, 2023 were as follows: ● Revenue was $474.9 million for the quarter ended September 30, 2023, a 7.6% increase from $441.1 million for the quarter ended June 30, 2023 and a 4.1% decrease from $495.4 million for the quarter ended
  evidence_url: https://www.sec.gov/Archives/edgar/data/1280452/000143774923029394/0001437749-23-029394-index.htm

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