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 |
|---|---|---|---|---|---|---|
| 2025-11-03 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −40 | $1,035.25 | $41K | 74,379 |
| 2025-11-03 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −47 | $1,038.41 | $49K | 74,332 |
| 2025-10-30 | Hsing Michael CEO | Shares withheld for taxes | −121,918 | $1,096.63 | $133.7M | 995,669 |
| 2025-10-30 | BLEGEN THEODORE EVP and CFO | Shares withheld for taxes | −48,298 | $1,096.63 | $53.0M | 77,332 |
| 2025-10-30 | Tseng Saria EVP & General Counsel | Shares withheld for taxes | −54,543 | $1,096.63 | $59.8M | 207,331 |
| 2025-10-30 | Sciammas Maurice EVP, WW Sales & Marketing | Shares withheld for taxes | −54,543 | $1,096.63 | $59.8M | 183,306 |
| 2025-10-30 | Xiao Deming EVP, Global Operations | Shares withheld for taxes | −54,543 | $1,096.63 | $59.8M | 201,637 |
| 2025-10-25 | Tseng Saria EVP & General Counsel | Grant or award | +135,520 | 261,874 | ||
| 2025-10-25 | BLEGEN THEODORE EVP and CFO | Grant or award | +87,690 | 125,630 | ||
| 2025-10-25 | Hsing Michael CEO | Grant or award | +302,920 | 1,117,587 | ||
| 2025-10-25 | Xiao Deming EVP, Global Operations | Grant or award | +135,520 | 256,180 | ||
| 2025-10-25 | Sciammas Maurice EVP, WW Sales & Marketing | Grant or award | +135,520 | 237,849 | ||
| 2025-10-24 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −1,300 | $1,087.62 | $1.4M | 126,354 |
| 2025-10-16 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −1,499 | $1,021.26 | $1.5M | 128,967 |
| 2025-10-16 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −1,313 | $1,030.81 | $1.4M | 127,654 |
| 2025-10-15 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −14,028 | $1,016.18 | $14.3M | 130,466 |
| 2025-10-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −6 | $902.61 | $5K | 40,933 |
| 2025-10-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −40 | $903.82 | $36K | 40,893 |
| 2025-10-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −60 | $904.00 | $54K | 40,833 |
| 2025-10-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −115 | $905.37 | $104K | 40,718 |
Page 18 of 59 · 1,177 trades