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 |
|---|---|---|---|---|---|---|
| 2026-01-02 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −40 | $940.03 | $38K | 70,121 |
| 2026-01-02 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −406 | $941.60 | $382K | 69,715 |
| 2026-01-02 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −74 | $942.42 | $70K | 69,641 |
| 2026-01-02 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −539 | $943.71 | $509K | 69,102 |
| 2026-01-02 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −650 | $944.35 | $614K | 68,452 |
| 2026-01-02 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −40 | $945.00 | $38K | 68,412 |
| 2026-01-02 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −80 | $946.62 | $76K | 68,332 |
| 2025-12-24 | Tseng Saria EVP & General Counsel | Gift | −1,000 | 166,331 | ||
| 2025-12-24 | Tseng Saria EVP & General Counsel | Gift | +1,000 | 1,000 | ||
| 2025-12-24 | Lee Victor K Director | Sale 10b5-1 | −197 | $949.70 | $187K | 29,370 |
| 2025-12-24 | Lee Victor K Director | Sale 10b5-1 | −280 | $950.64 | $266K | 29,090 |
| 2025-12-24 | Lee Victor K Director | Sale 10b5-1 | −160 | $951.60 | $152K | 28,930 |
| 2025-12-24 | Lee Victor K Director | Sale 10b5-1 | −83 | $952.37 | $79K | 28,847 |
| 2025-12-24 | Lee Victor K Director | Sale 10b5-1 | −200 | $953.70 | $191K | 28,647 |
| 2025-12-24 | Lee Victor K Director | Sale 10b5-1 | −80 | $955.08 | $76K | 28,567 |
| 2025-12-09 | Hsing Michael CEO | Gift | −12,337 | 906,332 | ||
| 2025-12-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −40 | $899.73 | $36K | 74,292 |
| 2025-12-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −40 | $900.88 | $36K | 74,252 |
| 2025-12-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −80 | $901.88 | $72K | 74,172 |
| 2025-12-01 | BLEGEN THEODORE EVP and CFO | Sale 10b5-1 | −40 | $902.31 | $36K | 74,132 |
Page 11 of 59 · 1,177 trades