Robert W. Dean II - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 3, 2026
Robert W. Dean II has filed 4 SEC Form 4 filings across 1 company in the last 90 days - selling. Lifetime open-market sales: $43K.
Profile
Robert W. Dean II is a corporate insider at MONOLITHIC POWER SYSTEMS, INC. (MPWR). Dean has reported 3 insider filings with the SEC since 2026. The most recent filing was in May 2026.
| Role | Interim CFO |
|---|---|
| Notability | 20/100 |
Board memberships
- MONOLITHIC POWER SYSTEMS, INC.
Awards & honors
- Listed as an insider of Monolithic Power Systems, Inc. in the 2026 SEC filing
Trading Pattern
InsiderAlpha's records for Robert W. Dean II go back to 2026: 4 primary Form 4 filings, an average of 4.0 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 Robert W. Dean II 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.
- Interim CFO at MONOLITHIC POWER SYSTEMS, INC. (MPWR) - 4 filings, 2026
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-07-28 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | A - Grant or award | 1.4K | $0.00 | |
| 2026-05-28 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 22 | $1,649.56 | $36K |
| 2026-05-20 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 4 | $1,563.28 | $6K |
| 2026-05-15 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | J - Other acquisition / disposition | 2.2K | $0.00 |
Companies - Last 90 Days
- MONOLITHIC POWER SYSTEMS, INC. (MPWR) - 4 filings, last 2026-07-28
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades at the companies Robert W. Dean II 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
- 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
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
- Saul B. Rosenthal
- Jack Ross
- Martine A. Rothblatt
- Saba Capital Management, L.P.
- Nicholas S. Schorsch
- Trygve Seglem
- Lawrence B. Seidman
- Thomas J. Shaw
Frequently Asked Questions
Who is Robert W. Dean II?
Robert W. Dean II is a corporate insider at MONOLITHIC POWER SYSTEMS, INC. (MPWR). Dean has reported 3 insider filings with the SEC since 2026. The most recent filing was in May 2026.…
How many SEC Form 4 filings has Robert W. Dean II submitted recently?
4 primary Form 4 filings in the last 90 days, covering 1 company.
Has Robert W. Dean II been buying or selling stock?
Recorded transactions: 0 open-market purchases and 2 open-market sales ($43K) across all tracked filings.
Where can I see all of Robert W. Dean II'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 Robert W. Dean II profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.