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 |
|---|---|---|---|---|---|---|
| 2026-07-01 | 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 |
| 2026-05-29 | Sciammas Maurice EVP, WW Sales & Marketing | Gift | −12,472 | 12,625 | ||
| 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 | Gift | −200 | 156,783 | ||
| 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 |
| 2026-05-18 | Hsing Michael CEO | Sale | −5,819 | $1,467.62 | $8.5M | 879,020 |
| 2026-05-18 | Hsing Michael CEO | Sale | −5,049 | $1,472.84 | $7.4M | 873,971 |
| 2026-05-18 | Hsing Michael CEO | Sale | −4,082 | $1,476.96 | $6.0M | 869,889 |
| 2026-05-18 | Hsing Michael CEO | Sale | −5,737 | $1,482.51 | $8.5M | 864,152 |
| 2026-05-18 | Hsing Michael CEO | Sale | −6,688 | $1,486.76 | $9.9M | 857,464 |
| 2026-05-18 | Hsing Michael CEO | Sale | −862 | $1,491.48 | $1.3M | 856,602 |
| 2026-05-18 | Hsing Michael CEO | Sale | −608 | $1,499.46 | $912K | 855,994 |
| 2026-05-18 | Hsing Michael CEO | Sale | −2,929 | $1,503.05 | $4.4M | 853,065 |
| 2026-05-18 | Hsing Michael CEO | Sale | −3,769 | $1,507.70 | $5.7M | 849,296 |
| 2026-05-18 | Hsing Michael CEO | Sale | −551 | $1,513.11 | $834K | 848,745 |
| 2026-05-18 | Hsing Michael CEO | Sale | −352 | $1,518.15 | $534K | 848,393 |
Page 3 of 59 · 1,177 trades