Insider trade

CFO sold ~$90K of MPWR shares in the open market

Traded Feb 2, 2026 · Filed Feb 4, 2026

~$90K
Approx. value · 80 sh @ $1,127.39: 68K
Holds after · shares reported: +26.1%
stock since the trade · S&P 500 +11.4%, $1,173.22 → $1,479.89 on Oct 5

Why it stands out

The CFO of Monolithic Power Systems sold $90K of Monolithic Power Systems shares. The filing says it was made under a pre-arranged trading plan.

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 2, 2026
Reporting period: Not applicable
Filed with the SEC: Feb 4, 2026

CFO$25K–$100KPre-arranged plan referenced

Context

Classification

open market sale

Code S — open-market or private sale

Absolute commitment

~$90,191

Shares × reported transaction price

Timing vs results

95 days after results of Oct 30, 2025, 3 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 $1,173.22 on Feb 2, 2026, within 1% of its 52-week high, after a 29% rise over the previous 30 trading days

52-week range $455.19 (Apr 8, 2025) to $1,183.15 (Jan 29, 2026), 99% of the way up, from 251 adjusted closes. 30 trading days earlier: $912.25 on Dec 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

After it was reported

After	Stock	S&P 500	Difference
7 days	0.0%	+0.5%	−0.6%
30 days	−8.1%	+0.1%	−8.2%
90 days	+42.9%	+8.3%	+34.6%
180 days	+15.5%	+13.8%	+1.7%

Past results only. Not a forecast.

Source receipt

Record ID: 0001214659-26-001149
Filed / recorded: Feb 4, 2026, 3:10 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: Theodore Blegen
Relationship: Officer
Officer title: EVP and CFO
Security: Common Stock
Table: Non-derivative (Table I)
Transaction date: Feb 2, 2026
Transaction code: S
Shares / units: 80
Price per share: $1,127.39
Acquired / disposed: Disposed (D)
Shares owned after: 67,672
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 2/26/2025.
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 $1,127.28 to $1,127.49. 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.