# Monolithic Power Systems (MPWR): value investors who own it

2 value investors held Monolithic Power Systems in their Q2 2026 13F, led by Torray Investment Partners, Maverick Capital.

## 13F holders

| Manager | Portfolio | Value | Change | Quarters held |
| --- | --- | --- | --- | --- |
| Torray Investment Partners | 0.7% | $5.1m | Added +0.2% | 31 |
| Maverick Capital | 0.0% | $820k | New | 1 |

## Directors buying and selling (Form 4, last 12 months)

| Date | Who | Role | Bought or sold | Shares | Value |
| --- | --- | --- | --- | --- | --- |
| 2026-09-28 | Hsing Michael | CEO | Sold | 10967 | $14.8m |
| 2026-09-28 | Hsing Michael | CEO | Sold | 6343 | $8.5m |
| 2026-09-28 | Hsing Michael | CEO | Sold | 5783 | $7.8m |
| 2026-09-28 | Hsing Michael | CEO | Sold | 2949 | $3.9m |
| 2026-09-28 | Hsing Michael | CEO | Sold | 2121 | $2.8m |
| 2026-09-28 | Hsing Michael | CEO | Sold | 1111 | $1.5m |
| 2026-09-28 | Hsing Michael | CEO | Sold | 596 | $789k |
| 2026-09-28 | Hsing Michael | CEO | Sold | 130 | $176k |
| 2026-08-24 | CHANG KUO WEI HERBERT | Director | Sold | 50 | $64k |
| 2026-08-24 | DEAN ROBERT W II | Interim CFO | Sold | 32 | $42k |
| 2026-08-17 | DEAN ROBERT W II | Interim CFO | Sold | 6 | $8k |
| 2026-08-11 | CHANG KUO WEI HERBERT | Director | Sold | 50 | $71k |
| 2026-08-05 | DEAN ROBERT W II | Interim CFO | Sold | 105 | $141k |
| 2026-08-03 | Sciammas Maurice | EVP, WW Sales & Marketing | Sold | 30 | $40k |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sold | 5640 | $7.6m |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sold | 1864 | $2.5m |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sold | 1506 | $2.0m |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sold | 1460 | $2.0m |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sold | 776 | $1.0m |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sold | 527 | $692k |

Source: SEC filings, via moatshark (https://www.moatshark.com/s/mpwr). Values traded and returns are estimates. Not investment advice. Built 2026-10-23.