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Filing Details

Accession Number:: 0001280452-13-000278
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2013-09-25 19:15:17
Reporting Period:: 2013-09-23

Filing Date:: 2013-09-25
Accepted Time:: 2013-09-25 19:15:17
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1280452	Monolithic Power Systems Inc	MPWR	Semiconductors & Related Devices (3674)	770466789

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1360833	Maurice Sciammas	79 Great Oaks Blvd San Jose CA 95119	Sr. V.p.of Sales And Marketing	No	Yes	No	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2013-09-23	18,417	$8.90	123,055	No	4	M	Direct
Common Stock	Disposition	2013-09-23	18,417	$30.40	104,638	No	4	S	Direct
Common Stock	Acquisiton	2013-09-24	1,900	$8.90	106,538	No	4	M	Direct
Common Stock	Disposition	2013-09-24	1,900	$30.43	104,638	No	4	S	Direct
Common Stock	Acquisiton	2013-09-24	10,000	$8.90	114,638	No	4	M	Direct
Common Stock	Disposition	2013-09-24	10,000	$30.60	104,638	No	4	S	Direct
Common Stock	Acquisiton	2013-09-24	23,450	$14.89	128,088	No	4	M	Direct
Common Stock	Disposition	2013-09-24	23,450	$30.60	104,638	No	4	S	Direct
Common Stock	Acquisiton	2013-09-24	10,000	$17.92	114,638	No	4	M	Direct
Common Stock	Disposition	2013-09-24	10,000	$30.52	104,638	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	S	Direct
No	4	M	Direct
No	4	S	Direct
No	4	M	Direct
No	4	S	Direct
No	4	M	Direct
No	4	S	Direct
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

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Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Incentive Stock Option (right to buy)	Disposition	2013-09-23	18,417	$0.00	18,417	$9.32
Common Stock	Incentive Stock Option (right to buy)	Disposition	2013-09-24	1,900	$0.00	1,900	$9.32
Common Stock	Non-Qualified Stock Option (right to buy)	Disposition	2013-09-24	10,000	$0.00	10,000	$9.32
Common Stock	Non-Qualified Stock Option (right to buy)	Disposition	2013-09-24	23,450	$0.00	23,450	$15.60
Common Stock	Non-Qualified Stock Option (right to buy)	Disposition	2013-09-24	10,000	$0.00	10,000	$18.77

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
1,900	2006-06-15	2015-06-15	No	4	M	Direct
0	2006-06-15	2015-06-15	No	4	M	Direct
18,788	2006-06-15	2015-06-15	No	4	M	Direct
0	2010-01-31	2015-02-08	No	4	M	Direct
47,000	2009-08-03	2014-08-03	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	12,746	Indirect	by Family Trust

Footnotes

In accordance with the reporting person's 10b5-1 trading plan.
On December 11, 2012, the Company's Board declared a special cash dividend of $1.00 per common share, which was paid on December 28, 2012 to all shareholders of record as of the close of business on December 21, 2012. The Board approved a modification whereby each outstanding option as of December 28, 2012 was increased by a ratio of 1.0471 with a corresponding reduction in the exercise price.
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 $30.22 to $30.815. 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.
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 $30.32 to $30.515. 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.
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 $30.36 to $30.745. 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.
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 $30.4246 to $30.75. 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.
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 $30.40 to $30.60. 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.