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MONOLITHIC POWER SYSTEMS INC Director's Dealing 2013

May 31, 2013

30057_dirs_2013-05-31_2a49d89f-d43b-46e5-80ca-95873fa11a20.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: 2013-05-28

Reporting Person: CHANG KUO WEI HERBERT (Director)

Non-Derivative Transactions

Date Security Code Shares Price A/D Holdings After Ownership
2013-05-28 Common Stock S 5000.0 $24.5647 Disposed 86262 Direct
2013-05-30 Common Stock S 10000.0 $24.5753 Disposed 76262 Direct
2013-05-31 Common Stock S 12500.0 $24.754 Disposed 63762 Direct

Footnotes

F1: 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 $24.5294 to $24.60. 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.

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 $24.50 to $24.70. 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 $24.50 to $24.525. 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.