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 |
| 2026-05-18 | Hsing Michael CEO | Sale | −3,424 | $1,462.61 | $5.0M | 884,839 |
| 2026-05-18 | Hsing Michael CEO | Sale | −5,819 | $1,467.62 | $8.5M | 879,020 |
| 2026-05-18 | Hsing Michael CEO | Sale | −5,049 | $1,472.84 | $7.4M | 873,971 |
| 2026-05-18 | Hsing Michael CEO | Sale | −4,082 | $1,476.96 | $6.0M | 869,889 |
| 2026-05-18 | Hsing Michael CEO | Sale | −5,737 | $1,482.51 | $8.5M | 864,152 |
| 2026-05-18 | Hsing Michael CEO | Sale | −6,688 | $1,486.76 | $9.9M | 857,464 |
| 2026-05-18 | Hsing Michael CEO | Sale | −862 | $1,491.48 | $1.3M | 856,602 |
| 2026-05-18 | Hsing Michael CEO | Sale | −608 | $1,499.46 | $912K | 855,994 |
| 2026-05-18 | Hsing Michael CEO | Sale | −2,929 | $1,503.05 | $4.4M | 853,065 |
| 2026-05-18 | Hsing Michael CEO | Sale | −3,769 | $1,507.70 | $5.7M | 849,296 |
| 2026-05-18 | Hsing Michael CEO | Sale | −551 | $1,513.11 | $834K | 848,745 |
| 2026-05-18 | Hsing Michael CEO | Sale | −352 | $1,518.15 | $534K | 848,393 |
Page 1 of 14 · 271 trades