Insider trade

CFO sold ~$42K of MPWR shares in the open market

Traded Aug 24, 2026 · Filed Aug 26, 2026

~$42K
Reported value · 32 sh @ $1,297.72: 7,094
Holds after · shares reported: +5.9%
stock since the trade · S&P 500 +0.1%, $1,285.03 → $1,360.97 on Oct 1

Why it stands out

The money chief of Monolithic Power Systems sold $42K of Monolithic Power Systems shares. It happened by itself, for taxes or pay.

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: Aug 24, 2026
Reporting period: Not applicable
Filed with the SEC: Aug 26, 2026

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

Context

Classification

open market sale

Code S — open-market or private sale

Absolute commitment

~$41,527

Shares × reported transaction price

Timing vs results

25 days after results of Jul 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 $1,285.03 on Aug 24, 2026, 56% above its 52-week low and 24% below its high, little changed over the previous 30 trading days

52-week range $823.65 (Sep 2, 2025) to $1,689.89 (Jun 3, 2026), 53% of the way up, from 251 adjusted closes. 30 trading days earlier: $1,291.38 on Jul 13, 2026. Describes the past only, not a forecast

Planned / mechanical clue

Footnote references tax withholding

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	-7.4%	+0.3%	-7.7%
30 days	+3.1%	-0.7%	+3.8%

Past results only. Not a forecast.

Source receipt

Record ID: 0001214659-26-010932
Filed / recorded: Aug 26, 2026, 11:22 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: Robert W Ii Dean
Relationship: Officer
Officer title: Interim CFO
Security: Common Stock
Table: Non-derivative (Table I)
Transaction date: Aug 24, 2026
Transaction code: S
Shares / units: 32
Price per share: $1,297.72
Acquired / disposed: Disposed (D)
Shares owned after: 7,094
Ownership form: Direct
Amendment: No

Footnotes from the filing

The reported sale was to cover tax withholding obligations upon the vesting of restricted stock units.
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 $1,296.07 to $1,298.01. 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.

Around the same time

5w ago

2,000Shares

Gift or transfer — classified separately from trades.

Why it stands out Official record

5w ago

2,000Shares

Gift or transfer — classified separately from trades.

Why it stands out Official record

6w ago

5Shares

Not classified as an open-market trade.

Why it stands out Official record