CIK 0001280452 · Large accelerated filer
MONOLITHIC POWER SYSTEMS, INC.
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- MPWR
- Exchange
- Nasdaq
- Industry
- Semiconductors & Related Devices
- FY end
- Dec 31
- Incorporated
- DE
- Entity type
- operating
- EIN
- 770466789
- Phone
- 561-839-3999
- Business address
- 1555 PALM BEACH LAKES BLVD., WEST PALM BEACH, FL, 33401
- Former names
- MONOLITHIC POWER SYSTEMS INC
- Open-market buys, last 90 days
- $0
- in 0 filings
- Open-market sales, last 90 days
- $40,491,820
- in 5 filings, $40.4M under 10b5-1 plans
Net −$40,491,820. Shares bought or sold at a price by officers, directors and 10% owners (Form 4 codes P and S). Grants, option exercises and tax withholding aren't counted.
Who's trading
90 days
Reading 100 more Form 4s from the SEC; this list fills in as they're read.
| Date | Insider | Transaction | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|
| 2026-07-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −1,460 | $1,339.59 | $2.0M | 162,734 |
| 2026-07-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −1,864 | $1,344.16 | $2.5M | 160,870 |
| 2026-07-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −1,506 | $1,348.91 | $2.0M | 159,364 |
| 2026-07-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −5,640 | $1,352.95 | $7.6M | 153,724 |
| 2026-07-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −50 | $1,359.36 | $68K | 153,674 |
| 2026-07-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −240 | $1,369.18 | $329K | 153,434 |
| 2026-07-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −472 | $1,375.47 | $649K | 152,962 |
| 2026-07-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −418 | $1,378.73 | $576K | 152,544 |
| 2026-07-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −410 | $1,384.11 | $567K | 152,134 |
| 2026-07-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −50 | $1,388.19 | $69K | 152,084 |
| 2026-07-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −213 | $1,396.16 | $297K | 151,871 |
| 2026-07-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −117 | $1,400.45 | $164K | 151,754 |
| 2026-07-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −110 | $1,405.71 | $155K | 151,644 |
| 2026-07-01 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −30 | $1,351.61 | $41K | 1,149 |
| 2026-06-01 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −30 | $1,533.95 | $46K | 1,179 |
| 2026-05-27 | Tseng Saria EVP & General Counsel | Sale | −7,565 | $1,700.00 | $12.9M | 144,218 |
| 2026-05-26 | DEAN ROBERT W II Interim CFO | Sale | −22 | $1,649.56 | $36K | 5,878 |
| 2026-05-26 | Zhou Jeff Director | Sale | −486 | $1,680.00 | $816K | 3,800 |
| 2026-05-22 | Tseng Saria EVP & General Counsel | Sale | −5,000 | $1,586.43 | $7.9M | 151,783 |
| 2026-05-18 | Hsing Michael CEO | Sale | −3,424 | $1,462.61 | $5.0M | 884,839 |
Page 2 of 63 · 1,253 trades