Michael Hsing sold $40.3M of MPWR stock

Michael Hsing, CEO of Monolithic Power Systems, Inc. (MPWR), sold 30,000 shares of MPWR stock worth $40.3M, per an SEC Form 4 filed Sep 30, 2026.

The sale was pre-arranged (a 10b5-1 plan or an option exercise), not a fresh decision.

The trade happened on Sep 28, 2026, 2 days before it was made public.

MPWR has moved +7.1% since the trade date, from $1351.20 to $1447.40 (Nov 12, 2026 close).