Insider trade

Director sold ~$485K of MPWR shares in the open market

Traded Feb 9, 2026 · Filed Feb 11, 2026

~$485K
Reported value · 400 sh @ $1,212.16: 28K
Holds after · shares reported: +22.7%
stock since the trade · S&P 500 +11.7%, $1,206.18 → $1,479.89 on Oct 5

Why it stands out

A board member of Monolithic Power Systems sold $485K 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 9, 2026
Reporting period: Not applicable
Filed with the SEC: Feb 11, 2026

Director$100K–$500KPre-arranged plan referenced

Context

Classification

open market sale

Code S — open-market or private sale

Absolute commitment

~$484,864

Shares × reported transaction price

Timing vs results

4 days after results of Feb 5, 2026, 80 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 $1,206.18 on Feb 9, 2026, within 2% of its 52-week high, after a 27% rise over the previous 30 trading days

52-week range $455.19 (Apr 8, 2025) to $1,229.82 (Feb 6, 2026), 97% of the way up, from 251 adjusted closes. 30 trading days earlier: $953.25 on Dec 24, 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	+1.7%	+0.5%	+1.2%
30 days	-6.8%	-1.8%	-5.0%
90 days	+42.8%	+9.0%	+33.8%
180 days	+21.3%	+13.1%	+8.2%

Past results only. Not a forecast.

Source receipt

Record ID: 0001214659-26-001517
Filed / recorded: Feb 11, 2026, 11:44 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: Victor K Lee
Relationship: Director
Security: Common Stock
Table: Non-derivative (Table I)
Transaction date: Feb 9, 2026
Transaction code: S
Shares / units: 400
Price per share: $1,212.16
Acquired / disposed: Disposed (D)
Shares owned after: 27,756
Ownership form: Direct
Amendment: No

Footnotes from the filing

This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 8/25/2025.

Around the same time

7mo ago

Congress trade

$15,001 - $50,000Reported range · official band, not an exact amount

Held by the filer's joint per the disclosure. Disclosed 26 days after the transaction; reported as an official range, not an exact amount.

Why it stands out Official record

CEO sold ~$14.7M of Monolithic Power Systems

Scheduled in advance8mo ago

CEO sold ~$5.79M of Monolithic Power Systems

Scheduled in advance8mo ago