Monolithic Power Systems, Inc. (MPWR)
Nasdaq: MPWR · Semiconductors & Related Devices · West Palm Beach, FL · filing with the SEC since 2004
Grade7.0
◀ Past 6.2● Present 8.3▶ Future 6.1
Who owns Monolithic Power Systems, Inc.
As filed with the SECHolders of 5% or more
5
Fmr LLC holds 10.5% of COMMON STOCK, as its SCHEDULE 13G/A filed Jul 8, 2026 says.
Directors and officers
12
report now, of 15 people on the record since 2006. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 5 named at left.
Holders of 5% or moreshare of the class, as filed
Fmr LLC
SCHEDULE 13G/A · filed Jul 8, 2026 · COMMON STOCK · 8.3% in Feb 5, 2026
Blackrock, Inc.
SCHEDULE 13G/A · filed Jan 8, 2026 · Common Stock · 9.8% in Apr 17, 2025
Vanguard Capital Management
SCHEDULE 13G · filed Apr 30, 2026 · Common Stock
Invesco LTD
SCHEDULE 13G · filed Jul 15, 2026 · Common Stock
Vanguard Portfolio Management
SCHEDULE 13G · filed Apr 29, 2026 · Common Stock
The Vanguard Group
SCHEDULE 13G/A · filed Mar 27, 2026 · Common Stock · reported falling below 5%, from 12.4% in Jul 29, 2025
What MPWR reports owning in othersstakes of 5% or more, and other ties
Other ties the annual report names
Axign
A company bought · acquisition · Dec 2023 · owns, named in the 10-K filed Feb 27, 2026
Insider tradesForm 4
290sales
0purchases
152sales on a scheduled plan
11people selling
$725Msold, in dollars
$0bought, in dollars
Open-market trades on Form 4 from Nov 5, 2025 to Nov 5, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Nov 5, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window11 of 15 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Hsing Michael | CEO | 89 | $355M | 39 | 0 | $0 |
| Tseng Saria | EVP & General Counsel | 62 | $132M | 31 | 0 | $0 |
| Sciammas Maurice | EVP, WW Sales & Marketing | 61 | $101M | 32 | 0 | $0 |
| Xiao Deming | EVP, Global Operations | 5 | $76.4M | 0 | 0 | $0 |
| Blegen Theodore | EVP and CFO | 43 | $34.4M | 42 | 0 | $0 |
| Elmiger Eugen J | director | 9 | $19.0M | 0 | 0 | $0 |
| Zhou Jeff | director | 4 | $3.3M | 0 | 0 | $0 |
| Lee Victor K | director | 8 | $2.0M | 8 | 0 | $0 |
| Wynne Eileen | director | 1 | $500,000 | 0 | 0 | $0 |
| Chang Kuo Wei Herbert | director | 4 | $300,000 | 0 | 0 | $0 |
| Dean Robert W II | Interim CFO | 5 | $200,000 | 0 | 0 | $0 |