Deming Xiao insider trades: Monolithic Power Systems (MPWR) stock sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Deming reports to the SEC
Open-market buys and sales
313 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| May 6, 2026 | MPWR | ↓ Sell | 30,000 | $1654.55 | $49.6M | Direct | May 8, 2026 (2d) |
| Feb 6, 2026 | MPWR | ↓ Sell | 22,875 | $1171.16 | $26.8M | Direct | Feb 10, 2026 (4d) |
| Aug 1, 2025 | MPWR | ↓ Sell | 39,999 | $780.00 | $31.2M | Direct | Aug 4, 2025 (3d) |
| Feb 10, 2025 | MPWR | ↓ Sell | 662 | $717.10 | $475K | Direct | Feb 12, 2025 (2d) |
| Nov 8, 2024 | MPWR | ↓ Sell | 866 | $765.14 | $663K | Direct | Nov 13, 2024 (5d) |
| Aug 27, 2024 | MPWR | ↓ Sell | 9,259 | $950.00 | $8.8M | by Spouse | Aug 29, 2024 (2d) |
| Aug 22, 2024 | MPWR | ↓ Sell | 10,000 | $950.00 | $9.5M | by Spouse | Aug 22, 2024 (0d) |
| Aug 8, 2024 | MPWR | ↓ Sell | 859 | $778.39 | $669K | Direct | Aug 12, 2024 (4d) |
| Jul 22, 2024 | MPWR | ↓ Sell | 3,205 | $831.58 | $2.7M | Direct | Jul 24, 2024 (2d) |
| May 22, 2024 | MPWR | ↓ Sell | 1,300 | $769.40 | $1.0M | Direct | May 22, 2024 (0d) |
| May 8, 2024 | MPWR | ↓ Sell | 869 | $690.02 | $600K | Direct | May 9, 2024 (1d) |
| Feb 8, 2024 | MPWR | ↓ Sell | 859 | $680.00 | $584K | Direct | Feb 9, 2024 (1d) |
| Feb 5, 2024 | MPWR | ↓ Sell | 982 | $641.00 | $629K | Direct | Feb 7, 2024 (2d) |
| Jan 10, 2024 | MPWR | ↓ Sell | 11,515 | $589.35 | $6.8M | Direct | Jan 11, 2024 (1d) |
| Jan 4, 2024 | MPWR | ↓ Sell | 25,314 | $583.14 | $14.8M | Direct | Jan 8, 2024 (4d) |
| Nov 8, 2023 | MPWR | ↓ Sell | 859 | $490.39 | $421K | Direct | Nov 9, 2023 (1d) |
| Nov 6, 2023 | MPWR | ↓ Sell | 982 | $492.92 | $484K | Direct | Nov 7, 2023 (1d) |
| Oct 2, 2023 | MPWR | ↓ Sell | 4,305 | $458.30 | $2.0M | Direct | Oct 4, 2023 (2d) |
| Aug 8, 2023 | MPWR | ↓ Sell | 874 | $530.26 | $463K | Direct | Aug 10, 2023 (2d) |
| Aug 4, 2023 | MPWR | ↓ Sell | 988 | $526.53 | $520K | Direct | Aug 7, 2023 (3d) |
| Jul 21, 2023 | MPWR | ↓ Sell | 9,615 | $534.23 | $5.1M | Direct | Jul 25, 2023 (4d) |
| Jul 3, 2023 | MPWR | ↓ Sell | 4,305 | $537.79 | $2.3M | Direct | Jul 5, 2023 (2d) |
| May 9, 2023 | MPWR | ↓ Sell | 857 | $409.79 | $351K | Direct | May 10, 2023 (1d) |
| May 4, 2023 | MPWR | ↓ Sell | 991 | $459.60 | $455K | Direct | May 5, 2023 (1d) |
| May 3, 2023 | MPWR | ↓ Sell | 3,462 | $463.55 | $1.6M | Direct | May 4, 2023 (1d) |
| Apr 3, 2023 | MPWR | ↓ Sell | 4,360 | $487.99 | $2.1M | Direct | Apr 6, 2023 (3d) |
| Feb 15, 2023 | MPWR | ↓ Sell10b5-1 | 1,497 | $530.00 | $793K | Direct | Feb 17, 2023 (2d) |
| Feb 13, 2023 | MPWR | ↓ Sell | 1,639 | $492.31 | $807K | Direct | Feb 13, 2023 (0d) |
| Feb 9, 2023 | MPWR | ↓ Sell10b5-1 | 2,129 | $520.00 | $1.1M | Direct | Feb 10, 2023 (1d) |
| Feb 8, 2023 | MPWR | ↓ Sell | 6,922 | $462.41 | $3.2M | Direct | Feb 10, 2023 (2d) |
| Feb 6, 2023 | MPWR | ↓ Sell | 723 | $446.88 | $323K | Direct | Feb 8, 2023 (2d) |
| Jan 24, 2023 | MPWR | ↓ Sell10b5-1 | 10,243 | $430.00 | $4.4M | Direct | Jan 25, 2023 (1d) |
| Jan 12, 2023 | MPWR | ↓ Sell10b5-1 | 2,980 | $400.00 | $1.2M | Direct | Jan 17, 2023 (5d) |
| Jan 3, 2023 | MPWR | ↓ Sell | 5,528 | $344.96 | $1.9M | Direct | Jan 5, 2023 (2d) |
| Nov 15, 2022 | MPWR | ↓ Sell | 3,762 | $401.92 | $1.5M | Direct | Nov 16, 2022 (1d) |
| Nov 4, 2022 | MPWR | ↓ Sell | 982 | $343.98 | $338K | Direct | Nov 7, 2022 (3d) |
| Oct 3, 2022 | MPWR | ↓ Sell | 4,305 | $372.60 | $1.6M | Direct | Oct 4, 2022 (1d) |
| Aug 12, 2022 | MPWR | ↓ Sell | 1,633 | $525.95 | $859K | Direct | Aug 12, 2022 (0d) |
| Aug 4, 2022 | MPWR | ↓ Sell | 984 | $522.39 | $514K | Direct | Aug 8, 2022 (4d) |
| Jul 1, 2022 | MPWR | ↓ Sell | 4,515 | $361.58 | $1.6M | Direct | Jul 6, 2022 (5d) |
| May 27, 2022 | MPWR | ↓ Sell | 1,495 | $457.00 | $683K | Direct | May 31, 2022 (4d) |
| May 24, 2022 | MPWR | ↓ Sell | 4,298 | $392.44 | $1.7M | Direct | May 26, 2022 (2d) |
| May 12, 2022 | MPWR | ↓ Sell | 1,679 | $388.10 | $652K | Direct | May 16, 2022 (4d) |
| May 6, 2022 | MPWR | ↓ Sell | 986 | $453.16 | $447K | Direct | May 5, 2022 (0d) |
| Apr 1, 2022 | MPWR | ↓ Sell | 4,420 | $467.23 | $2.1M | Direct | Apr 5, 2022 (4d) |
| Feb 14, 2022 | MPWR | ↓ Sell | 1,663 | $429.60 | $714K | Direct | Feb 16, 2022 (2d) |
| Feb 8, 2022 | MPWR | ↓ Sell | 9,093 | $399.62 | $3.6M | Direct | Feb 9, 2022 (1d) |
| Jan 3, 2022 | MPWR | ↓ Sell | 4,305 | $490.87 | $2.1M | Direct | Jan 5, 2022 (2d) |
| Nov 30, 2021 | MPWR | ↓ Sell | 4,366 | $560.00 | $2.4M | Direct | Dec 2, 2021 (2d) |
| Nov 22, 2021 | MPWR | ↓ Sell | 427 | $580.00 | $248K | Direct | Nov 23, 2021 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other MPWR insiders
Open-market trades in the last 12 months
About Deming Xiao's insider trades
Deming Xiao is EVP, Global Operations at Monolithic Power Systems (MPWR). Since Aug 16, 2005, Deming has reported no open-market purchases and 313 sales worth $342.3M on SEC Form 4. In the last 12 months: 2 sales ($76.4M).
5 sales (3% of the value sold) were made under a Rule 10b5-1 trading plan, which is set up months in advance and runs on a schedule, so they say little about how the insider sees the stock today.
Their filings also include grants and awards (46 filings), other transactions (33 filings), option exercises (31 filings), gifts (6 filings). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every MPWR insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.