MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2026

Feb 4, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2026-02-02

Reporting Person: BLEGEN THEODORE (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-02	Common Stock	S	220	$1110.58	Disposed	68112	Direct
2026-02-02	Common Stock	S	40.00	$1117.11	Disposed	68072	Direct
2026-02-02	Common Stock	S	80.00	$1120.77	Disposed	67992	Direct
2026-02-02	Common Stock	S	40.00	$1122.56	Disposed	67952	Direct
2026-02-02	Common Stock	S	200.00	$1126.58	Disposed	67752	Direct
2026-02-02	Common Stock	S	80.00	$1127.39	Disposed	67672	Direct
2026-02-02	Common Stock	S	240.00	$1128.43	Disposed	67432	Direct
2026-02-02	Common Stock	S	240.00	$1129.28	Disposed	67192	Direct
2026-02-02	Common Stock	S	320.00	$1130.48	Disposed	66872	Direct
2026-02-02	Common Stock	S	198.00	$1131.70	Disposed	66674	Direct
2026-02-02	Common Stock	S	322.00	$1132.67	Disposed	66352	Direct
2026-02-02	Common Stock	S	379.00	$1133.47	Disposed	65973	Direct
2026-02-02	Common Stock	S	241.00	$1134.41	Disposed	65732	Direct
2026-02-02	Common Stock	S	120.00	$1135.49	Disposed	65612	Direct
2026-02-02	Common Stock	S	120.00	$1136.35	Disposed	65492	Direct
2026-02-02	Common Stock	S	80.00	$1137.81	Disposed	65412	Direct
2026-02-02	Common Stock	S	80.00	$1139.49	Disposed	65333	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 $1,110.14 to $1,110.68. 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.

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 $1,126.50 to $1,126.71. 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 $1,127.28 to $1,127.49. 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 $1,128.32 to $1,128.64. 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.

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 $1,129.07 to $1,129.60. 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 $1,130.18 to $1,130.95. 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.

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 $1,131.38 to $1,131.91. 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 $1,132.33 to $1,132.84. 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 $1,133.00 to $1,133.86. 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 $1,134.00 to $1,134.78. 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 $1,135.09 to $1,135.71. 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 $1,136.18 to $1,136.69. 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 $1,139.44 to $1,139.54. 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: Ending balance has been adjusted for a one share rounding difference.