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 |
|---|---|---|---|---|---|---|
| 2025-10-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −250 | $907.36 | $227K | 40,468 |
| 2025-10-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −80 | $909.52 | $73K | 40,388 |
| 2025-10-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −65 | $911.27 | $59K | 40,323 |
| 2025-10-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −676 | $912.73 | $617K | 39,647 |
| 2025-10-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −138 | $913.87 | $126K | 39,509 |
| 2025-10-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −390 | $914.71 | $357K | 39,119 |
| 2025-10-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −440 | $915.43 | $403K | 38,679 |
| 2025-10-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −580 | $916.37 | $531K | 38,099 |
| 2025-10-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −160 | $917.17 | $147K | 37,940 |
| 2025-09-18 | Martinez Carintia Director | Sale 10b5-1 | −1,400 | $900.00 | $1.3M | 878 |
| 2025-09-18 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −14,510 | $914.45 | $13.3M | 144,494 |
| 2025-09-02 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −100 | $803.43 | $80K | 43,839 |
| 2025-09-02 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −100 | $804.64 | $80K | 43,739 |
| 2025-09-02 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −200 | $806.57 | $161K | 43,539 |
| 2025-09-02 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −100 | $808.53 | $81K | 43,439 |
| 2025-09-02 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −500 | $811.45 | $406K | 42,939 |
| 2025-09-02 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −100 | $812.84 | $81K | 42,839 |
| 2025-09-02 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −100 | $813.09 | $81K | 42,739 |
| 2025-09-02 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −200 | $814.75 | $163K | 42,539 |
| 2025-09-02 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −400 | $815.39 | $326K | 42,139 |
Page 19 of 59 · 1,177 trades