Insider trade

Officer sold ~$12.9M of MPWR shares in the open market

Traded May 27, 2026 · Filed May 29, 2026

~$12.9M
Reported value · 7,565 sh @ $1,700.00: 144K
Holds after · shares reported: -16.0%
stock since the trade · S&P 500 +1.8%, $1,620.17 → $1,360.97 on Oct 1

Why it stands out

Monolithic Power Systems's & General Counsel sold $12.9M of Monolithic Power Systems shares. Nobody planned it ahead of time.

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: May 27, 2026
Reporting period: Not applicable
Filed with the SEC: May 29, 2026

Officer$1M+

Context

Classification

open market sale

Code S — open-market or private sale

Absolute commitment

~$12,860,500

Shares × reported transaction price

Timing vs results

27 days after results of Apr 30, 2026, 64 days before 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 $1,620.17 on May 27, 2026, within 3% of its 52-week high, after a 19% rise over the previous 30 trading days

52-week range $661.90 (May 30, 2025) to $1,662.98 (May 26, 2026), 96% of the way up, from 251 adjusted closes. 30 trading days earlier: $1,363.42 on Apr 14, 2026. Describes the past only, not a forecast

Planned / mechanical clue

None found in footnotes

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	+1.1%	-2.5%	+3.6%
30 days	-13.7%	-1.7%	-12.0%
90 days	-17.8%	+1.1%	-18.9%

Past results only. Not a forecast.

Source receipt

Record ID: 0001214659-26-006933
Filed / recorded: May 29, 2026, 10:43 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: Saria Tseng
Relationship: Officer
Officer title: EVP & General Counsel
Security: Common Stock
Table: Non-derivative (Table I)
Transaction date: May 27, 2026
Transaction code: S
Shares / units: 7,565
Price per share: $1,700.00
Acquired / disposed: Disposed (D)
Shares owned after: 144,218
Ownership form: Direct
Amendment: No

Around the same time

Officer sold ~$46K of Monolithic Power Systems

Scheduled in advance4mo ago

4mo ago

12KShares

Gift or transfer — classified separately from trades.

Why it stands out Official record

CFO sold ~$36K of Monolithic Power Systems

Automatic sale4mo ago