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 |
|---|---|---|---|---|---|---|
| 2026-04-08 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −840 | $1,319.25 | $1.1M | 157,103 |
| 2026-04-08 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −120 | $1,321.94 | $159K | 156,983 |
| 2026-04-06 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −244 | $1,139.96 | $278K | 173,338 |
| 2026-04-06 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −556 | $1,144.42 | $636K | 172,782 |
| 2026-04-06 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −480 | $1,149.05 | $552K | 172,302 |
| 2026-04-06 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −560 | $1,159.62 | $649K | 171,742 |
| 2026-04-06 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −684 | $1,165.66 | $797K | 171,058 |
| 2026-04-06 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −2,036 | $1,170.38 | $2.4M | 169,022 |
| 2026-04-06 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −1,680 | $1,176.35 | $2.0M | 167,342 |
| 2026-04-06 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −1,396 | $1,179.50 | $1.6M | 165,946 |
| 2026-04-01 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −576 | $1,131.24 | $652K | 174,406 |
| 2026-04-01 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −184 | $1,132.15 | $208K | 174,222 |
| 2026-04-01 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −160 | $1,134.14 | $181K | 174,062 |
| 2026-04-01 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −188 | $1,135.91 | $214K | 173,874 |
| 2026-04-01 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −292 | $1,136.99 | $332K | 173,582 |
| 2026-04-01 | Sciammas Maurice EVP, WW Sales & Marketing | Sale 10b5-1 | −30 | $1,116.44 | $33K | 1,239 |
| 2026-03-30 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −5,154 | $1,000.81 | $5.2M | 195,502 |
| 2026-03-30 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −9,080 | $1,005.18 | $9.1M | 186,422 |
| 2026-03-30 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −3,360 | $1,009.63 | $3.4M | 183,062 |
| 2026-03-30 | Tseng Saria EVP & General Counsel | Sale 10b5-1 | −3,194 | $1,017.22 | $3.2M | 179,868 |
Page 6 of 59 · 1,177 trades