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 |
|---|---|---|---|---|---|---|
| 2025-12-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −120 | $904.38 | $109K | 74,012 |
| 2025-12-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −80 | $906.84 | $73K | 73,932 |
| 2025-12-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −80 | $907.59 | $73K | 73,852 |
| 2025-12-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −480 | $908.69 | $436K | 73,372 |
| 2025-12-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −1,984 | $909.00 | $1.8M | 71,388 |
| 2025-12-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −56 | $911.59 | $51K | 71,332 |
| 2025-11-26 | Tseng Saria EVP & General Counsel | Sale | −240 | $922.78 | $221K | 187,091 |
| 2025-11-26 | Tseng Saria EVP & General Counsel | Sale | −1,200 | $923.54 | $1.1M | 185,891 |
| 2025-11-26 | Tseng Saria EVP & General Counsel | Sale | −1,327 | $924.32 | $1.2M | 184,564 |
| 2025-11-26 | Tseng Saria EVP & General Counsel | Sale | −1,126 | $925.55 | $1.0M | 183,438 |
| 2025-11-26 | Tseng Saria EVP & General Counsel | Sale | −10,360 | $926.02 | $9.6M | 173,078 |
| 2025-11-26 | Tseng Saria EVP & General Counsel | Sale | −1,845 | $927.41 | $1.7M | 171,233 |
| 2025-11-26 | Tseng Saria EVP & General Counsel | Sale | −984 | $928.60 | $914K | 170,249 |
| 2025-11-26 | Tseng Saria EVP & General Counsel | Sale | −2,238 | $929.29 | $2.1M | 168,011 |
| 2025-11-26 | Tseng Saria EVP & General Counsel | Sale | −680 | $930.48 | $633K | 167,331 |
| 2025-11-25 | Tseng Saria EVP & General Counsel | Sale | −385 | $894.54 | $344K | 206,946 |
| 2025-11-25 | Tseng Saria EVP & General Counsel | Sale | −1,625 | $895.63 | $1.5M | 205,321 |
| 2025-11-25 | Tseng Saria EVP & General Counsel | Sale | −2,066 | $896.37 | $1.9M | 203,255 |
| 2025-11-25 | Tseng Saria EVP & General Counsel | Sale | −754 | $897.54 | $677K | 202,501 |
| 2025-11-25 | Tseng Saria EVP & General Counsel | Sale | −145 | $898.38 | $130K | 202,356 |
Page 12 of 59 · 1,177 trades