Michael Hsing - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 3, 2026
Michael Hsing has filed 1 SEC Form 4 filing across 1 company in the last 90 days - selling. Lifetime open-market sales: $297.64M.
Profile
Michael Hsing is a corporate insider at MONOLITHIC POWER SYSTEMS, INC. (MPWR). Hsing has reported 12 insider filings with the SEC since 2024. The most recent filing was in May 2026.
| Role | CEO |
|---|---|
| Notability | 20/100 |
Board memberships
- MONOLITHIC POWER SYSTEMS, INC.
Awards & honors
- Led Monolithic Power Systems to significant growth
- Pioneered innovations in power management technology
- Expanded the company's market reach across various sectors
Trading Pattern
InsiderAlpha's records for Michael Hsing go back to 2024: 11 primary Form 4 filings, an average of 3.7 per year. 31 recorded transactions carry a Rule 10b5-1 flag, meaning they were pre-scheduled under a written trading plan rather than discretionary.
Career & Filing History
Every role Michael Hsing 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.
- CEO at MONOLITHIC POWER SYSTEMS, INC. (MPWR) - 11 filings, 2024 to 2026
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-05-21 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 130 | $1,521.43 | $198K |
| 2026-05-21 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 352 | $1,518.15 | $534K |
| 2026-05-21 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 551 | $1,513.11 | $834K |
| 2026-05-21 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 3.8K | $1,507.70 | $5.68M |
| 2026-05-21 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 2.9K | $1,503.05 | $4.40M |
| 2026-05-21 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 608 | $1,499.46 | $912K |
| 2026-05-21 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 862 | $1,491.48 | $1.29M |
| 2026-05-21 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 6.7K | $1,486.76 | $9.94M |
| 2026-05-21 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 5.7K | $1,482.51 | $8.51M |
| 2026-05-21 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 4.1K | $1,476.96 | $6.03M |
| 2026-05-21 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 5.0K | $1,472.84 | $7.44M |
| 2026-05-21 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 5.8K | $1,467.62 | $8.54M |
| 2026-05-21 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 3.4K | $1,462.61 | $5.01M |
| 2026-02-17 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 1.4K | $1,217.12 | $1.75M |
| 2026-02-17 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 1.2K | $1,210.11 | $1.50M |
| 2026-02-17 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 3.6K | $1,205.82 | $4.39M |
| 2026-02-17 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 1.4K | $1,200.81 | $1.73M |
| 2026-02-17 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 600 | $1,194.34 | $717K |
| 2026-02-17 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 160 | $1,188.23 | $190K |
| 2026-02-17 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 480 | $1,180.79 | $567K |
Companies - Last 90 Days
- MONOLITHIC POWER SYSTEMS, INC. (MPWR) - 1 filing, last 2026-05-21
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades at the companies Michael Hsing 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.
- Saria Tseng - $145.64M of MPWR open-market activity in the last 12 months
- Deming Xiao - $76.43M 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:
- Andrew J. Mills
- Charles N. Mills
- Kevin J. Mills
- Mink Brook Asset Management LLC
- Shankh Mitra
- MITSUI SUMITOMO INSURANCE CO LTD
- Arturo R. Moreno
- Matthew T. Moroun
Frequently Asked Questions
Who is Michael Hsing?
Michael Hsing is a corporate insider at MONOLITHIC POWER SYSTEMS, INC. (MPWR). Hsing has reported 12 insider filings with the SEC since 2024. The most recent filing was in May 2026.…
How many SEC Form 4 filings has Michael Hsing submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has Michael Hsing been buying or selling stock?
Recorded transactions: 0 open-market purchases and 74 open-market sales ($297.64M) across all tracked filings.
Where can I see all of Michael Hsing'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 Michael Hsing profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.