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 |
|---|---|---|---|---|---|---|
| 2026-05-06 | Elmiger Eugen J Director | Sale | −2,619 | $1,596.42 | $4.2M | 5,916 |
| 2026-05-06 | Elmiger Eugen J Director | Sale | −514 | $1,600.14 | $822K | 5,402 |
| 2026-05-06 | Xiao Deming EVP, Global Operations | Sale | −3,329 | $1,648.38 | $5.5M | 232,630 |
| 2026-05-06 | Xiao Deming EVP, Global Operations | Sale | −14,167 | $1,652.80 | $23.4M | 218,463 |
| 2026-05-06 | Xiao Deming EVP, Global Operations | Sale | −11,597 | $1,657.93 | $19.2M | 206,866 |
| 2026-05-06 | Xiao Deming EVP, Global Operations | Sale | −907 | $1,661.38 | $1.5M | 205,959 |
| 2026-05-06 | Wynne Eileen Director | Sale | −335 | $1,582.68 | $530K | 1,007 |
| 2026-05-06 | Zhou Jeff Director | Sale | −500 | $1,650.00 | $825K | 4,286 |
| 2026-05-05 | Zhou Jeff Director | Sale | −514 | $1,574.48 | $809K | 5,286 |
| 2026-05-05 | Zhou Jeff Director | Sale | −500 | $1,600.00 | $800K | 4,786 |
| 2026-05-05 | Sciammas Maurice EVP, WW Sales & Marketing | Sale | −380 | $1,583.81 | $602K | 919 |
| 2026-05-04 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −30 | $1,588.73 | $48K | 1,209 |
| 2026-04-08 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −560 | $1,266.48 | $709K | 165,386 |
| 2026-04-08 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −360 | $1,270.29 | $457K | 165,026 |
| 2026-04-08 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −240 | $1,279.55 | $307K | 164,786 |
| 2026-04-08 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −120 | $1,287.12 | $154K | 164,666 |
| 2026-04-08 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −400 | $1,292.08 | $517K | 164,266 |
| 2026-04-08 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −800 | $1,302.52 | $1.0M | 163,466 |
| 2026-04-08 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −1,279 | $1,308.30 | $1.7M | 162,187 |
| 2026-04-08 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −4,244 | $1,312.82 | $5.6M | 157,943 |
Page 5 of 59 · 1,177 trades