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MONOLITHIC POWER SYSTEMS INC Director's Dealing 2014

May 9, 2014

30057_dirs_2014-05-09_c68c6c13-1426-4995-bb8a-a41c6631ed88.zip

Director's Dealing

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SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2014-05-08

Reporting Person: Tseng Saria (VP & General Counsel)

Non-Derivative Transactions

Date Security Code Shares Price A/D Holdings After Ownership
2014-05-08 Common Stock S 1462.0 $36.4302 Disposed 47793 Direct
2014-05-08 Common Stock S 70.0 $36.43 Disposed 47723 Direct
2014-05-09 Common Stock S 61.0 $36.15 Disposed 47662 Direct
2014-05-09 Common Stock S 1307.0 $36.6725 Disposed 46355 Direct

Holdings (Non-Derivative)

Security Shares Ownership
Common Stock 2000 Indirect

Footnotes

F1: Shares sold to pay tax obligations resulting from the vesting of restricted stock units.

F2: In accordance with the reporting person's 10b5-1 trading plan.

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 $36.24 to $37.04. 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.