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Insider Trading Arrangements
 3 Months Ended 9 Months Ended
Sep. 30, 2025
shares
Sep. 30, 2025
shares
Trading Arrangements, by Individual [Table]    
Material Terms of Trading Arrangement [Text Block]  

Item 5. Other Information

 

Certain of our executive officers and directors have entered into trading plans pursuant to Rule 10b5-1(c) of the Securities Exchange Act of 1934, as amended. A trading plan is a written document that pre-establishes the amounts, prices and dates (or formula for determining the amounts, prices and dates) of future purchases or sales of our common stock, including the sale of shares acquired pursuant to the Monolithic Power Systems, Inc. 2004 Employee Stock Purchase Plan, amended and restated, and upon vesting of RSUs.

 

The following table summarizes the adoption of trading plans intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) during the three months ended September 30, 2025:

 

Name and Title

 

Adoption Date

 

Plan Duration

 

Intended Sale Amount (in shares)

Victor K. Lee, Director

 

August 25, 2025

 

Through August 31, 2026

 

Up to 2,000

Michael Hsing, President, Chief Executive Officer and Director

 

August 28, 2025

 

Through August 31, 2026

 

Up to 100,000

 

The following table summarizes the termination of trading plans intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) during the three months ended September 30, 2025:

 

Name and Title

 

Termination Date

 

Original Plan Duration

 

Intended Sale Amount (in shares)

 

Sold Amount (in shares)

Deming Xiao, Executive Vice President, Global Operations

 

August 5, 2025

 

Through February 27, 2026

 

Up to 160,000

 

39,999

 

During the three months ended September 30, 2025, no trading plans intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) were modified, and no other written trading arrangements that are not intended to qualify for the Rule 10b5-1(c) affirmative defense were adopted, modified, or terminated.
Non-Rule 10b5-1 Arrangement Adopted [Flag] false  
Non-Rule 10b5-1 Arrangement Terminated [Flag] false  
Victor K Lee [Member]    
Trading Arrangements, by Individual [Table]    
Trading Arrangement, Securities Aggregate Available Amount 2,000 2,000
Rule 10b5-1 Arrangement Adopted [Flag] true  
Trading Arrangement, Individual Name Victor K. Lee  
Trading Arrangement, Individual Title Director  
Trading Arrangement Adoption Date August 25, 2025  
Michael Hsing [Member]    
Trading Arrangements, by Individual [Table]    
Trading Arrangement, Securities Aggregate Available Amount 100,000 100,000
Rule 10b5-1 Arrangement Adopted [Flag] true  
Trading Arrangement, Individual Name Michael Hsing  
Trading Arrangement, Individual Title President, Chief Executive Officer and Director  
Trading Arrangement Adoption Date August 28, 2025  
Deming Xiao [Member]    
Trading Arrangements, by Individual [Table]    
Trading Arrangement, Securities Aggregate Available Amount 39,999 39,999
Trading Arrangement, Individual Name Deming Xiao  
Trading Arrangement, Individual Title Executive Vice President, Global Operations  
Rule 10b5-1 Arrangement Terminated [Flag] true  
Trading Arrangement Termination Date August 5, 2025