MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2025

Nov 28, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2025-11-25

Reporting Person: Tseng Saria (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-11-25	Common Stock	S	385	$894.54	Disposed	206946	Direct
2025-11-25	Common Stock	S	1625	$895.63	Disposed	205321	Direct
2025-11-25	Common Stock	S	2066	$896.37	Disposed	203255	Direct
2025-11-25	Common Stock	S	754	$897.54	Disposed	202501	Direct
2025-11-25	Common Stock	S	145	$898.38	Disposed	202356	Direct
2025-11-25	Common Stock	S	320	$899.37	Disposed	202036	Direct
2025-11-25	Common Stock	S	346	$900.41	Disposed	201690	Direct
2025-11-25	Common Stock	S	880	$901.58	Disposed	200810	Direct
2025-11-25	Common Stock	S	120	$902.07	Disposed	200690	Direct
2025-11-25	Common Stock	S	160	$903.54	Disposed	200530	Direct
2025-11-25	Common Stock	S	200	$904.39	Disposed	200330	Direct
2025-11-25	Common Stock	S	160	$905.32	Disposed	200170	Direct
2025-11-25	Common Stock	S	272	$906.33	Disposed	199898	Direct
2025-11-25	Common Stock	S	10200	$907.21	Disposed	189698	Direct
2025-11-25	Common Stock	S	888	$908.49	Disposed	188810	Direct
2025-11-25	Common Stock	S	556	$909.35	Disposed	188254	Direct
2025-11-25	Common Stock	S	359	$910.42	Disposed	187895	Direct
2025-11-25	Common Stock	S	324	$911.92	Disposed	187571	Direct
2025-11-25	Common Stock	S	240	$912.30	Disposed	187331	Direct

Footnotes

F1: 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 $894.17 to $894.81. 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.

F2: 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 $895.14 to $895.89. 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.

F3: 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 $896.01 to $896.98. 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.

F4: 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 $897.32 to $897.83. 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.

F5: 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 $898.05 to $898.56. 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.

F6: 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 $899.01 to $899.90. 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.

F7: 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 $900.02 to $900.90. 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.

F8: 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 $901.22 to $901.94. 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.

F9: 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 $902.01 to $902.14. 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.

F10: 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 $903.36 to $903.72. 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.

F11: 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 $904.12 to $904.81. 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.

F12: 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 $905.07 to $905.53. 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.

F13: 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 $906.14 to $906.67. 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.

F14: 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 $907.20 to $907.73. 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.

F15: 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 $908.02 to $908.89. 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.

F16: 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 $909.02 to $909.74. 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.

F17: 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 $910.01 to $910.96. 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.

F18: 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 $911.85 to $911.95. 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.

F19: 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 $912.12 to $912.48. 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.