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Filing Details

Accession Number:: 0001280452-21-000045
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2021-04-02 15:06:41
Reporting Period:: 2021-03-31

Accepted Time:: 2021-04-02 15:06:41
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	5808 Lake Washington Blvd Ne Kirkland WA 98033	Sr. V.p.of Sales And Marketing	No	Yes	No	No

Reported Non-Derivative Transactions

Show Other Fields >>

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2021-03-31	8,500	$0.00	324,715	No	5	G	Direct
Common Stock	Disposition	2021-04-01	4,305	$364.78	320,410	No	4	S	Direct
Common Stock	Acquisiton	2021-03-31	8,500	$0.00	17,500	No	4	G	Indirect	By GRAT
Common Stock	Disposition	2021-04-01	10	$358.79	1,193	No	4	S	Indirect	By Sciammas Trst2020
Common Stock	Disposition	2021-04-01	29	$360.70	1,164	No	4	S	Indirect	By Sciammas Trst2020
Common Stock	Disposition	2021-04-01	115	$363.43	1,049	No	4	S	Indirect	By Sciammas Trst2020
Common Stock	Disposition	2021-04-01	384	$365.12	665	No	4	S	Indirect	By Sciammas Trst2020
Common Stock	Disposition	2021-04-01	460	$366.02	205	No	4	S	Indirect	By Sciammas Trst2020
Common Stock	Disposition	2021-04-01	173	$366.93	32	No	4	S	Indirect	By Sciammas Trst2020
Common Stock	Disposition	2021-04-01	32	$368.02	0	No	4	S	Indirect	By Sciammas Trst2020

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	5	G	Direct
No	4	S	Direct
No	4	G	Indirect	By GRAT
No	4	S	Indirect	By Sciammas Trst2020
No	4	S	Indirect	By Sciammas Trst2020
No	4	S	Indirect	By Sciammas Trst2020
No	4	S	Indirect	By Sciammas Trst2020
No	4	S	Indirect	By Sciammas Trst2020
No	4	S	Indirect	By Sciammas Trst2020
No	4	S	Indirect	By Sciammas Trst2020

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	2,000	Indirect	by Family Trust

Footnotes

This transaction involved a gift of securities by the reporting person to the Grantor Retained Annuity Trusts, of which Maurice Sciammas and his wife are the trustee and grantors.
The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plans.
The securities are held by two Grantor Retained Annuity Trusts, of which Maurice Sciammas and his wife are the trustee and grantors.
In accordance with the reporting person's 10b5-1 trading plan.
Represents shares of stock owned by The Sciammas Family 2020 Irrevocable Trust DTD 04/29/2020. The reporting person is the trustee of the Sciammas Family 2020 Irrevocable Trust. The reporting person may be deemed to beneficially own the shares of common stock owned by The Sciammas Family 2020 Irrevocable Trust.
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 $363.13 to $364.02. 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.
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 $364.50 to $365.50. 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 $365.51 to $366.50. 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 $366.59 to $367.57. 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 $367.93 to $368.03. 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.