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MONOLITHIC POWER SYSTEMS INC Director's Dealing 2012

May 2, 2012

30057_dirs_2012-05-02_e6ad3ff1-591f-4240-a928-5817fbeac229.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: 2012-04-30

Reporting Person: Xiao Deming (Pres. of MPS Asia Operations)

Non-Derivative Transactions

Date Security Code Shares Price A/D Holdings After Ownership
2012-04-30 Common Stock M 44494.0 $5.0 Acquired 193902.0 Direct
2012-04-30 Common Stock S 44494.0 $20.9001 Disposed 149408.0 Direct
2012-05-01 Common Stock M 2381.0 $5.0 Acquired 151789.0 Direct
2012-05-01 Common Stock S 16438.0 $21.872 Disposed 135351.0 Direct
2012-05-02 Common Stock S 1379.0 $21.002 Disposed 133972.0 Direct

Derivative Transactions

Date Security Exercise Price Code Shares A/D Expiration Underlying Ownership
2012-04-30 Incentive Stock Option (right to buy) $5.0 M 44494.0 Disposed 2014-01-28 Common Stock (44494.0) Direct
2012-05-01 Incentive Stock Option (right to buy) $5.0 M 2381.0 Disposed 2014-01-28 Common Stock (2381.0) Direct

Holdings (Non-Derivative)

Security Shares Ownership
Common Stock 18600.0 Indirect

Footnotes

F1: In accordance with the reporting person's 10b5-1 trading plan.

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 $20.80 to $21.08. 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 $21.52 to $22.02. 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: Shares sold to pay tax obligations resulting from the vesting of restricted stock units.