Insider trade

CFO sold ~$1.8M of MPWR shares in the open market

Traded Dec 1, 2025 · Filed Dec 3, 2025

~$1.8M
Reported value · 1,984 sh @ $909.00: 71K
Holds after · shares reported: +46.6%
stock since the trade · S&P 500 +12.3%, $928.35 → $1,360.97 on Oct 1

Why it stands out

The money chief of Monolithic Power Systems sold $1.8M of Monolithic Power Systems shares. It was planned long ago, so it says very little.

Written from the filing's own figures. OQRO describes what was reported and never tells you what to buy or sell

View the official recordSEC Form 4 — Statement of Changes in Beneficial Ownership

All the details

Dates, kept separate

Transaction date: Dec 1, 2025
Reporting period: Not applicable
Filed with the SEC: Dec 3, 2025

CFO$1M+Pre-arranged plan referenced

Context

Classification

open market sale

Code S — open-market or private sale

Absolute commitment

~$1,803,456

Shares × reported transaction price

Timing vs results

32 days after results of Oct 30, 2025, 66 days before results of Feb 5, 2026

Results dates are the company's own 8-K (Item 2.02). Many companies only let insiders trade in a window after results

Price at the time

Closed at $928.35 on Dec 1, 2025, 104% above its 52-week low and 16% below its high, after an 8% drop over the previous 30 trading days

52-week range $455.19 (Apr 8, 2025) to $1,105.05 (Oct 27, 2025), 73% of the way up, from 250 adjusted closes. 30 trading days earlier: $1,004.65 on Oct 17, 2025. Describes the past only, not a forecast

Planned / mechanical clue

Footnote references a pre-arranged trading plan (Rule 10b5-1)

Only flagged when a footnote says so; never inferred

Securities lawsuit open at the trade date

A securities lawsuit naming the company as a defendant was filed on Feb 4, 2025 in the U.S. District Court, W.D. Washington. A filing is an allegation, not a finding.

Waterford Township General Employees Retirement System v. Monolithic Power Systems Inc, docket 2:25-cv-00220, via CourtListener (court records). Nature of suit 850, company named as first defendant