MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2025

Nov 5, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2025-11-03

Reporting Person: BLEGEN THEODORE (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-11-03	Common Stock	S	204	$1013.62	Disposed	77128	Direct
2025-11-03	Common Stock	S	135	$1014.47	Disposed	76993	Direct
2025-11-03	Common Stock	S	80	$1016.51	Disposed	76913	Direct
2025-11-03	Common Stock	S	6	$1017.78	Disposed	76907	Direct
2025-11-03	Common Stock	S	180	$1018.01	Disposed	76727	Direct
2025-11-03	Common Stock	S	181	$1019.49	Disposed	76546	Direct
2025-11-03	Common Stock	S	160	$1020.30	Disposed	76386	Direct
2025-11-03	Common Stock	S	168	$1021.28	Disposed	76218	Direct
2025-11-03	Common Stock	S	40	$1022.28	Disposed	76178	Direct
2025-11-03	Common Stock	S	291	$1023.32	Disposed	75887	Direct
2025-11-03	Common Stock	S	208	$1024.86	Disposed	75679	Direct
2025-11-03	Common Stock	S	43	$1025.91	Disposed	75636	Direct
2025-11-03	Common Stock	S	200	$1027.49	Disposed	75436	Direct
2025-11-03	Common Stock	S	240	$1028.43	Disposed	75196	Direct
2025-11-03	Common Stock	S	246	$1029.45	Disposed	74950	Direct
2025-11-03	Common Stock	S	210	$1030	Disposed	74740	Direct
2025-11-03	Common Stock	S	17	$1031.86	Disposed	74723	Direct
2025-11-03	Common Stock	S	184	$1032.07	Disposed	74539	Direct
2025-11-03	Common Stock	S	80	$1033	Disposed	74459	Direct
2025-11-03	Common Stock	S	40	$1034.99	Disposed	74419	Direct
2025-11-03	Common Stock	S	40	$1035.25	Disposed	74379	Direct
2025-11-03	Common Stock	S	47	$1038.41	Disposed	74332	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	5331	Indirect
Common Stock	5331	Indirect

Footnotes

F1: These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 2/26/2025.

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 $1,013.45 to $1,013.75. 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 $1,014.12 to $1,014.64. 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 $1,016.43 to $1,016.59. 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 $1,019.10 to $1,019.68. 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 $1,020.20 to $1,020.40. 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 $1,021.04 to $1,021.32. 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 $1,023.07 to $1,023.98. 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.

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 $1,024.02 to $1,024.99. 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 $1,025.00 to $1,025.98. 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.

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 $1,027.03 to $1,027.89. 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.

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 $1,028.00 to $1,028.85. 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 $1,029.14 to $1,029.77. 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 $1,032.00 to $1,032.18. 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 $1,038.40 to $1,038.42. 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.