MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2026

Feb 13, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2026-02-11

Reporting Person: Hsing Michael (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-11	Common Stock	S	363	$1158.71	Disposed	953871	Direct
2026-02-11	Common Stock	S	1366	$1163.71	Disposed	952505	Direct
2026-02-11	Common Stock	S	1533	$1167.62	Disposed	950972	Direct
2026-02-11	Common Stock	S	1987	$1172.92	Disposed	948985	Direct
2026-02-11	Common Stock	S	2799	$1177.67	Disposed	946186	Direct
2026-02-11	Common Stock	S	1542	$1182.82	Disposed	944644	Direct
2026-02-11	Common Stock	S	2104	$1188.17	Disposed	942540	Direct
2026-02-11	Common Stock	S	6079	$1192.67	Disposed	936461	Direct
2026-02-11	Common Stock	S	14578	$1197.20	Disposed	921883	Direct
2026-02-11	Common Stock	S	649	$1202.28	Disposed	921234	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	133040	Indirect
Common Stock	12825	Indirect

Footnotes

F1: These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 8/25/2025.

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 $1,155.64 to $1,160.62 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 $1,160.70 to $1,165.64 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 $1,166.00 to $1,169.96. 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.

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 $1,170.10 to $1,175.09. 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 $1,175.27 to $1,180.19. 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 $1,180.29 to $1,185.29. 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 $1,185.33 to $1,190.26. 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 $1,190.39 to $1,195.37. 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 $1,195.44 to $1,200.37. 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 $1,200.46 to $1,203.86. 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.