---
schema_version: "secwatch.filing_event.v1"
accession: "0001437749-25-035995"
form_type: "8-K"
ticker: "MPWR"
cik: "0001280452"
company_name: "MONOLITHIC POWER SYSTEMS INC"
filed_at: "2025-11-21T23:59:59+00:00"
generated_at: "2026-05-16T17:33:28.951310+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# Monolithic Power Systems reduces special meeting ownership threshold to 25%

## Summary
- Amended Bylaws effective Nov 19, 2025 lower the ownership threshold to call a special meeting from 30% to 25% of outstanding shares.
- Board considered a non-binding stockholder proposal for a 10% threshold, but adopted 25% after feedback from top ten stockholders.
- Change is intended to balance stockholder access with board recommendation, reflecting peer company practices.

## SEC filing metadata
- accession: 0001437749-25-035995
- form_type: 8-K
- ticker: MPWR
- cik: 0001280452
- company_name: MONOLITHIC POWER SYSTEMS INC
- filed_at: 2025-11-21T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1280452/000143774925035995/0001437749-25-035995-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1280452/000143774925035995/mpwr20251107_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001437749-25-035995
- JSON: https://secwatch.observer/filing/0001437749-25-035995.json
- Plain text: https://secwatch.observer/filing/0001437749-25-035995.txt

## Key facts
- Governance Changes
  MONOLITHIC POWER SYSTEMS INC: Reduced the ownership threshold for stockholders to call a special meeting from at least 30% to at least 25% of outstanding shares (effective 2025-11-19).
  - Change: bylaw amendment
  - Effective: 2025-11-19
  source text: the Amended Bylaws reduce the ownership threshold (the “Ownership Threshold”) necessary for stockholders to call a special meeting of stockholders from at least 30% to at least 25% of the outstanding shares of capital stock of the Company entitled to vote generally for the election of directors.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1280452/000143774925035995/0001437749-25-035995-index.htm

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