Monolithic Power Systems MPWR

US equityMarket cap rank #248Semiconductors

$1,346.48

−$8.99 (-0.66%)

Market open · Sep 24, 1:10 pm ET

After hours $1,348.01 -0.55%

Open$1,322.71

Prev close$1,355.47

Day range$1,313.09 – $1,349.64

Volume151.2K

Market cap$66.17B

P/E (TTM)82.2

Dividend yield0.53%

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership98.9%-0.35 pts vs. prior quarter

Institutions holding1,505-7 vs. prior quarter

Insider trades (recent)3 buys / 9 sellsNet selling

Short interest4.07% of floatDays to cover 3.3 · as of 31 Aug 2026

Short-sale volume share16.4%5-day average of daily volume

Net of large-order buying minus selling, in USD. Over this window: −$6.20M (9 inflow days, 11 outflow days).

Institutional holders1,505

Institutional ownership98.9%

Total transactions12

Bought3

Sold9

Report date	Shares short	% of float	Days to cover
31 Aug 2026	1,998,007	4.1%	3.3
14 Aug 2026	1,839,078	3.7%	2.7
31 Jul 2026	2,122,311	4.3%	2.1
15 Jul 2026	2,456,955	5.0%	2.7
30 Jun 2026	2,214,362	4.5%	1.5
15 Jun 2026	2,348,322	4.8%	3.0