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 |
|---|---|---|---|---|---|---|
| 2026-03-30 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −2,200 | $1,023.00 | $2.3M | 177,668 |
| 2026-03-30 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −2,440 | $1,029.21 | $2.5M | 175,228 |
| 2026-03-30 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −166 | $1,035.60 | $172K | 175,062 |
| 2026-03-30 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −80 | $1,041.12 | $83K | 174,982 |
| 2026-03-20 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −30 | $1,095.07 | $33K | 1,269 |
| 2026-02-12 | Hsing Michael CEO | Sale 10b5-1 | −12,731 | $1,155.71 | $14.7M | 908,503 |
| 2026-02-12 | Hsing Michael CEO | Sale 10b5-1 | −4,992 | $1,159.84 | $5.8M | 903,511 |
| 2026-02-12 | Hsing Michael CEO | Sale 10b5-1 | −4,001 | $1,164.92 | $4.7M | 899,510 |
| 2026-02-12 | Hsing Michael CEO | Sale 10b5-1 | −2,076 | $1,168.80 | $2.4M | 897,434 |
| 2026-02-12 | Hsing Michael CEO | Sale 10b5-1 | −200 | $1,173.39 | $235K | 897,234 |
| 2026-02-12 | Hsing Michael CEO | Sale 10b5-1 | −480 | $1,180.79 | $567K | 896,754 |
| 2026-02-12 | Hsing Michael CEO | Sale 10b5-1 | −160 | $1,188.23 | $190K | 896,594 |
| 2026-02-12 | Hsing Michael CEO | Sale 10b5-1 | −600 | $1,194.34 | $717K | 895,994 |
| 2026-02-12 | Hsing Michael CEO | Sale 10b5-1 | −1,440 | $1,200.81 | $1.7M | 894,554 |
| 2026-02-12 | Hsing Michael CEO | Sale 10b5-1 | −3,640 | $1,205.82 | $4.4M | 890,914 |
| 2026-02-12 | Hsing Michael CEO | Sale 10b5-1 | −1,240 | $1,210.11 | $1.5M | 889,674 |
| 2026-02-12 | Hsing Michael CEO | Sale 10b5-1 | −1,440 | $1,217.12 | $1.8M | 888,234 |
| 2026-02-11 | Hsing Michael CEO | Sale 10b5-1 | −363 | $1,158.71 | $421K | 953,871 |
| 2026-02-11 | Hsing Michael CEO | Sale 10b5-1 | −1,366 | $1,163.71 | $1.6M | 952,505 |
| 2026-02-11 | Hsing Michael CEO | Sale 10b5-1 | −1,533 | $1,167.62 | $1.8M | 950,972 |
Page 7 of 59 · 1,177 trades