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MONOLITHIC POWER SYSTEMS INC Director's Dealing 2013

Feb 11, 2013

30057_dirs_2013-02-11_c04d3f0d-2c8b-4022-aca4-f837f5e217b1.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: 2013-02-07

Reporting Person: Tseng Saria (VP & General Counsel)

Non-Derivative Transactions

Date Security Code Shares Price A/D Holdings After Ownership
2013-02-07 Common Stock M 16250.0 $13.01 Acquired 90514.0 Direct
2013-02-07 Common Stock M 16250.0 $24.4683 Disposed 74264.0 Direct
2013-02-07 Common Stock M 9001.0 $8.0 Acquired 83265.0 Direct
2013-02-07 Common Stock S 9001.0 $24.5899 Disposed 74264.0 Direct
2013-02-07 Common Stock A 151.0 $0.0 Acquired 74415.0 Direct
2013-02-11 Common Stock S 1207.0 $24.6 Disposed 73208.0 Direct
2013-02-11 Common Stock S 58.0 $24.6 Disposed 73150.0 Direct

Derivative Transactions

Date Security Exercise Price Code Shares A/D Expiration Underlying Ownership
2013-02-07 Non-Qualified Stock Option (right to buy) $8.0 M 9001.0 Disposed 2014-11-17 Common Stock (9001.0) Direct
2013-02-07 Non-Qualified Stock Option (right to buy) $13.01 M 16250.0 Disposed 2015-10-22 Common Stock (16250.0) Direct

Holdings (Non-Derivative)

Security Shares Ownership
Common Stock 3000.0 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 $24.19 to $24.99. 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 $24.43 to $24.92. 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: Equitable stock dividend adjustment approved by the Board of Director as a result of dividend Payment to shareholders on December 28, 2012. Stock dividends will release according to the same vesting schedule as the original grants.

F5: Shares sold to pay tax obligations resulting from the release of restricted stock units.