MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2016

May 25, 2016

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2016-05-23

Reporting Person: Lee Victor K (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2016-05-23	Common Stock	M	5000.0	$20.2	Acquired	27796	Direct
2016-05-23	Common Stock	S	5000.0	$65.3055	Disposed	22796	Direct
2016-05-23	Common Stock	M	5000.0	$20.2	Acquired	27796	Direct
2016-05-23	Common Stock	S	5000.0	$65.57	Disposed	22796	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2016-05-23	Non-Qualified Stock Option (right to buy)	$20.2	M	5000.0	Disposed	2017-02-09	Common Stock (5000)	Direct
2016-05-23	Non-Qualified Stock Option (right to buy)	$20.2	M	5000.0	Disposed	2017-02-09	Common Stock (5000)	Direct

Footnotes

F1: Transaction was executed during an authorized trading window in compliance with the Company's Insider Trading Compliance Program.

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 $65.24 to $65.35. 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 $65.50 to $65.60. 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.