Form 4 for MPWR Monolithic Power Systems

Accepted 2025-08-21 00:00:00 ET · period of report 2025-08-19 · accession 0001214659-25-012568 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
MI	2025-08-21	2025-08-19	MPWR	Sciammas Maurice	EVP, WW Sales, Marketing	G - Gift	$0.00	-1,000	12.2K	-8%	$0

Purchase Sale Sale after option exercise All abbreviations

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Common Stock	2025-08-19	G	A	1,499	$0.00	1,499	I Rosalind Sciammas Brokerage Account	—	—	(F3) 1,499 shares were received by the Rosalind Sciammas brokerage account from Sciammas Siblings 2021 GRATs. No funds were exchanged, and no sale of shares occurred in the transfer
2	Common	Common Stock	2025-08-19	G	D	1,000	$0.00	1,000	I Peter Rafferty and Eric Toothill 2021Trust	—	—	(F1) 1,000 shares were distributed from the Peter Rafferty and Eric Toothill 2021 Irrevocable Trust, on which the reporting person is a Trustee, to an individual who is not an immediate family member living in the same household of the reporting person. In addition, the Company has determined that the reporting person does not have any management or investment control or any other pecuniary interests over the shares. No funds were exchanged and no sale of shares occurred in the transfer.
3	Common	Common Stock	2025-08-19	G	D	1,499	$0.00	12,228	I Various Sciammas GRATs	—	—	(F2) 1,499 shares were distributed from the Sciammas Siblings 2021 GRATs, on which the reporting person is a Trustee, to the Rosalind Sciammas brokerage account. No funds were exchanged, and no sale of shares occurred in the transfer.