Deming Xiao - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 3, 2026
Deming Xiao has filed 1 SEC Form 4 filing across 1 company in the last 90 days - selling. Lifetime open-market sales: $108.29M.
Profile
Deming Xiao is a corporate insider at MONOLITHIC POWER SYSTEMS, INC. (MPWR). Xiao has reported 8 insider filings with the SEC since 2024. The most recent filing was in May 2026.
| Role | EVP, Global Operations |
|---|---|
| Notability | 20/100 |
Board memberships
- MONOLITHIC POWER SYSTEMS, INC.
Awards & honors
- Executive Vice President at Monolithic Power Systems
- Involved in global operations management
- Contributed to the company's growth in power management solutions
Trading Pattern
InsiderAlpha's records for Deming Xiao go back to 2024: 8 primary Form 4 filings, an average of 2.7 per year. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Career & Filing History
Every role Deming Xiao has reported on a Form 4, reconstructed from the filings themselves - reporting insiders must state their relationship to the issuer (officer title, director seat, or 10% ownership) on every filing.
- EVP, Global Operations at MONOLITHIC POWER SYSTEMS, INC. (MPWR) - 8 filings, 2024 to 2026
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-05-08 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 907 | $1,661.38 | $1.51M |
| 2026-05-08 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 11.6K | $1,657.93 | $19.23M |
| 2026-05-08 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 14.2K | $1,652.80 | $23.42M |
| 2026-05-08 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 3.3K | $1,648.38 | $5.49M |
| 2026-02-10 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 22.9K | $1,171.16 | $26.79M |
| 2026-02-06 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | A - Grant or award | 57.2K | $0.00 | |
| 2025-10-31 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | F - Tax withholding / forfeiture | 54.5K | $1,096.63 | $59.81M |
| 2025-10-28 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | A - Grant or award | 135.5K | $0.00 | |
| 2025-08-11 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | G - Bona-fide gift | 945 | $0.00 | |
| 2025-08-11 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | G - Bona-fide gift | 945 | $0.00 | |
| 2025-08-01 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 40.0K | $780.00 | $31.20M |
| 2024-11-13 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 866 | $765.14 | $663K |
Companies - Last 90 Days
- MONOLITHIC POWER SYSTEMS, INC. (MPWR) - 1 filing, last 2026-05-08
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades at the companies Deming Xiao has recently filed at. Multiple unrelated insiders buying the same stock within a short window - cluster buying - has historically been one of the strongest Form 4 signals.
- Michael Hsing - $295.49M of MPWR open-market activity in the last 12 months
- Saria Tseng - $145.64M of MPWR open-market activity in the last 12 months
- Maurice Sciammas - $76.09M of MPWR open-market activity in the last 12 months
- Theodore Blegen - $39.81M of MPWR open-market activity in the last 12 months
- Eugen J. Elmiger - $22.41M of MPWR open-market activity in the last 12 months
- Jeff Zhou - $3.92M of MPWR open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
- Robert E. Dixon
- Romeo R. Dizon
- Kevin Michael Donahue
- DONEGAL MUTUAL INSURANCE CO
- DORCHESTER MINERALS OPERATING LP
- Robert W. Duggan
- John Earl
- EcoR1 Capital, LLC
Frequently Asked Questions
Who is Deming Xiao?
Deming Xiao is a corporate insider at MONOLITHIC POWER SYSTEMS, INC. (MPWR). Xiao has reported 8 insider filings with the SEC since 2024. The most recent filing was in May 2026.…
How many SEC Form 4 filings has Deming Xiao submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has Deming Xiao been buying or selling stock?
Recorded transactions: 0 open-market purchases and 7 open-market sales ($108.29M) across all tracked filings.
Where can I see all of Deming Xiao's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
Learn More
Open the live Deming Xiao profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.