Insider trade

CEO sold ~$18.4M of MPWR shares in the open market

Traded Feb 10, 2026 · Filed Feb 12, 2026

~$18.4M
Reported value · 16K sh @ $1,141.88: 962K
Holds after · shares reported: +19.2%
stock since the trade · S&P 500 +10.4%, $1,142.02 → $1,360.97 on Oct 1

Why it stands out

The boss of Monolithic Power Systems sold $18.4M 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: Feb 10, 2026
Reporting period: Not applicable
Filed with the SEC: Feb 12, 2026

CEO$1M+Pre-arranged plan referenced

Context

Classification

open market sale

Code S — open-market or private sale

Absolute commitment

~$18,361,430

Shares × reported transaction price

Timing vs results

5 days after results of Feb 5, 2026, 79 days before results of Apr 30, 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 $1,142.02 on Feb 10, 2026, 151% above its 52-week low and 7% below its high, after a 21% rise over the previous 30 trading days

52-week range $455.19 (Apr 8, 2025) to $1,229.82 (Feb 6, 2026), 89% of the way up, from 251 adjusted closes. 30 trading days earlier: $946.32 on Dec 26, 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

After it was reported

After	Stock	S&P 500	Difference
7 days	+2.8%	+1.1%	+1.7%
30 days	-8.0%	-1.9%	-6.2%
90 days	+37.8%	+9.7%	+28.0%
180 days	+21.6%	+13.3%	+8.3%

Past results only. Not a forecast.

Source receipt

Record ID: 0001214659-26-001587
Filed / recorded: Feb 12, 2026, 7:45 PM UTC
Added to OQRO: Oct 2, 2026, 12:28 PM UTC
Parser: form4-xml-v1
Data quality: Verified: identifiers matched exactly
Issuer: MONOLITHIC POWER SYSTEMS INC
Issuer CIK: 1280452
Ticker: MPWR
Reporting person: Michael Hsing
Relationship: Director, Officer
Officer title: CEO
Security: Common Stock
Table: Non-derivative (Table I)
Transaction date: Feb 10, 2026
Transaction code: S
Shares / units: 16,080
Price per share: $1,141.88
Acquired / disposed: Disposed (D)
Shares owned after: 961,527
Ownership form: Direct
Amendment: No

Footnotes from the filing

These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 08/28/2025.
The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,138.96 to $1,143.96. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.