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
- $40,463,134
- in 4 filings, $40.3M under 10b5-1 plans
Net −$40,463,134. 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 |
|---|---|---|---|---|---|---|
| 2026-05-18 | Hsing Michael CEO | Sale | −130 | $1,521.43 | $198K | 848,263 |
| 2026-05-18 | DEAN ROBERT W II Interim CFO | Sale | −4 | $1,563.28 | $6K | 5,900 |
| 2026-05-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −3,741 | $1,550.36 | $5.8M | 174,903 |
| 2026-05-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −1,717 | $1,557.48 | $2.7M | 173,186 |
| 2026-05-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −2,010 | $1,562.01 | $3.1M | 171,176 |
| 2026-05-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −2,020 | $1,567.15 | $3.2M | 169,156 |
| 2026-05-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −1,312 | $1,571.49 | $2.1M | 167,844 |
| 2026-05-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −703 | $1,577.75 | $1.1M | 167,141 |
| 2026-05-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −447 | $1,582.21 | $707K | 166,694 |
| 2026-05-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −50 | $1,585.51 | $79K | 166,644 |
| 2026-05-13 | Sciammas Maurice EVP, WW Sales & Marketing | Gift | −1,563 | 25,097 | ||
| 2026-05-13 | Sciammas Maurice EVP, WW Sales & Marketing | Gift | +1,563 | 51,023 | ||
| 2026-05-13 | DEAN ROBERT W II Interim CFO | Other disposition | −2,156 | 5,904 | ||
| 2026-05-06 | Elmiger Eugen J Director | Sale | −320 | $1,559.88 | $499K | 17,082 |
| 2026-05-06 | Elmiger Eugen J Director | Sale | −814 | $1,566.36 | $1.3M | 16,268 |
| 2026-05-06 | Elmiger Eugen J Director | Sale | −1,078 | $1,571.58 | $1.7M | 15,190 |
| 2026-05-06 | Elmiger Eugen J Director | Sale | −834 | $1,575.57 | $1.3M | 14,356 |
| 2026-05-06 | Elmiger Eugen J Director | Sale | −1,879 | $1,581.81 | $3.0M | 12,477 |
| 2026-05-06 | Elmiger Eugen J Director | Sale | −2,587 | $1,586.81 | $4.1M | 9,890 |
| 2026-05-06 | Elmiger Eugen J Director | Sale | −1,355 | $1,591.38 | $2.2M | 8,535 |
Page 4 of 59 · 1,177 trades