Hsing Michael sold MPWR

September 28, 2026 · Form 4 insider transaction

Hsing Michael sold 596 shares of Monolithic Power Systems, Inc. at $1323.31 per share, a transaction worth $788.7K. The trade was recorded as open-market sale under a pre-scheduled Rule 10b5-1 plan and disclosed on an SEC Form 4, filed 2 days after the transaction.

Direction
Disposed (sell-side)
Shares
596
Price
$1323.31
Total value
$788.7K
RoleOfficer, Director
SecurityCommon Stock
Transaction codeS: Open-market sale
Transaction dateSeptember 28, 2026
Filing dateSeptember 30, 2026
Shares owned after847,668
OwnershipDirect
10b5-1 planYes
AmendedNo

Footnotes

These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 05/29/2026.; 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 $1,320.64 to $1,325.61. 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.; Ending balance includes 1 share acquired on August 17, 2026, through the Company's qualified ESPP program.

View the original Form 4 on SEC EDGAR