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 |
|---|---|---|---|---|---|---|
| 2026-09-28 | Hsing Michael CEO | Sale 10b5-1 | −596 | $1,323.31 | $789K | 847,668 |
| 2026-09-28 | Hsing Michael CEO | Sale 10b5-1 | −2,121 | $1,328.54 | $2.8M | 845,547 |
| 2026-09-28 | Hsing Michael CEO | Sale 10b5-1 | −1,111 | $1,333.34 | $1.5M | 844,436 |
| 2026-09-28 | Hsing Michael CEO | Sale 10b5-1 | −2,949 | $1,338.66 | $3.9M | 841,487 |
| 2026-09-28 | Hsing Michael CEO | Sale 10b5-1 | −5,783 | $1,343.76 | $7.8M | 835,704 |
| 2026-09-28 | Hsing Michael CEO | Sale 10b5-1 | −6,343 | $1,347.15 | $8.5M | 829,361 |
| 2026-09-28 | Hsing Michael CEO | Sale 10b5-1 | −10,967 | $1,351.43 | $14.8M | 818,394 |
| 2026-09-28 | Hsing Michael CEO | Sale 10b5-1 | −130 | $1,356.94 | $176K | 818,264 |
| 2026-08-24 | DEAN ROBERT W II Interim CFO | Sale | −32 | $1,297.72 | $42K | 7,094 |
| 2026-08-24 | CHANG KUO WEI HERBERT Director | Sale | −50 | $1,281.57 | $64K | 515 |
| 2026-08-17 | DEAN ROBERT W II Interim CFO | Sale | −6 | $1,413.64 | $8K | 7,126 |
| 2026-08-11 | CHANG KUO WEI HERBERT Director | Sale | −50 | $1,420.00 | $71K | 565 |
| 2026-08-05 | DEAN ROBERT W II Interim CFO | Sale | −105 | $1,344.27 | $141K | 7,132 |
| 2026-08-03 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −30 | $1,343.94 | $40K | 1,119 |
| 2026-07-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −527 | $1,314.03 | $692K | 166,117 |
| 2026-07-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −274 | $1,318.42 | $361K | 165,843 |
| 2026-07-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −409 | $1,323.93 | $541K | 165,434 |
| 2026-07-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −464 | $1,329.30 | $617K | 164,970 |
| 2026-07-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −776 | $1,334.59 | $1.0M | 164,194 |
| 2026-07-15 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −1,460 | $1,339.59 | $2.0M | 162,734 |
Page 1 of 52 · 1,037 trades