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MONOLITHIC POWER SYSTEMS INC Director's Dealing 2012

Dec 3, 2012

30057_dirs_2012-12-03_3658c038-606b-42d1-bfd1-29d10d0a7b22.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: 2012-11-29

Reporting Person: Lee Victor K (Director)

Non-Derivative Transactions

Date Security Code Shares Price A/D Holdings After Ownership
2012-11-29 Common Stock M 5000.0 $9.68 Acquired 15335.0 Direct
2012-11-29 Common Stock M 5000.0 $9.68 Acquired 20335.0 Direct
2012-11-29 Common Stock S 5000.0 $21.104 Disposed 15335.0 Direct
2012-11-29 Common Stock S 5000.0 $21.052 Disposed 10335.0 Direct
2012-11-30 Common Stock M 5000.0 $9.68 Acquired 15335.0 Direct
2012-11-30 Common Stock S 5000.0 $21.166 Disposed 10335.0 Direct

Derivative Transactions

Date Security Exercise Price Code Shares A/D Expiration Underlying Ownership
2012-11-29 Non-Qualified Stock Option (right to buy) $9.68 M 5000.0 Disposed 2013-09-14 Common Stock (5000.0) Direct
2012-11-29 Non-Qualified Stock Option (right to buy) $9.68 M 5000.0 Disposed 2013-09-14 Common Stock (5000.0) Direct
2012-11-30 Non-Qualified Stock Option (right to buy) $9.68 M 5000.0 Disposed 2013-09-14 Common Stock (5000.0) 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 $21.10 to $21.13. 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 $21.0433 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 $21.15 to $21.21. 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.