Theodore Blegen - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 3, 2026
Theodore Blegen is a corporate insider tracked by InsiderAlpha. No SEC Form 4 filings recorded in the last 90 days. Lifetime open-market sales: $52.83M.
Profile
Theodore Blegen is a corporate insider at MONOLITHIC POWER SYSTEMS, INC. (MPWR). Blegen has reported 15 insider filings with the SEC since 2024. The most recent filing was in February 2026.
| Role | EVP and CFO |
|---|---|
| Notability | 20/100 |
Board memberships
- MONOLITHIC POWER SYSTEMS, INC.
Awards & honors
- Serves as EVP and CFO at Monolithic Power Systems
- Involved in 12 SEC filings
Trading Pattern
InsiderAlpha's records for Theodore Blegen go back to 2024: 15 primary Form 4 filings, an average of 5.0 per year. 62 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 Theodore Blegen 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 and CFO at MONOLITHIC POWER SYSTEMS, INC. (MPWR) - 15 filings, 2024 to 2026
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-02-10 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale | 21.7K | $1,171.16 | $25.44M |
| 2026-02-06 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | A - Grant or award | 38.7K | $0.00 | |
| 2026-02-04 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 80 | $1,139.49 | $91K |
| 2026-02-04 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 80 | $1,137.81 | $91K |
| 2026-02-04 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 120 | $1,136.35 | $136K |
| 2026-02-04 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 120 | $1,135.49 | $136K |
| 2026-02-04 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 241 | $1,134.41 | $273K |
| 2026-02-04 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 379 | $1,133.47 | $430K |
| 2026-02-04 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 322 | $1,132.67 | $365K |
| 2026-02-04 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 198 | $1,131.70 | $224K |
| 2026-02-04 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 320 | $1,130.48 | $362K |
| 2026-02-04 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 240 | $1,129.28 | $271K |
| 2026-02-04 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 240 | $1,128.43 | $271K |
| 2026-02-04 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 80 | $1,127.39 | $90K |
| 2026-02-04 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 200 | $1,126.58 | $225K |
| 2026-02-04 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 40 | $1,122.56 | $45K |
| 2026-02-04 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 80 | $1,120.77 | $90K |
| 2026-02-04 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 40 | $1,117.11 | $45K |
| 2026-02-04 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 220 | $1,110.58 | $244K |
| 2025-12-02 | MPWR | MONOLITHIC POWER SYSTEMS, INC. | S - Open-market sale [10b5-1] | 56 | $911.59 | $51K |
Most Active Insiders Right Now
Theodore Blegen has no recent co-filers at the same companies, so here are the insiders with the largest open-market activity across the market in the last 90 days.
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Frequently Asked Questions
Who is Theodore Blegen?
Theodore Blegen is a corporate insider at MONOLITHIC POWER SYSTEMS, INC. (MPWR). Blegen has reported 15 insider filings with the SEC since 2024. The most recent filing was in February 2026.…
Has Theodore Blegen been buying or selling stock?
Recorded transactions: 0 open-market purchases and 113 open-market sales ($52.83M) across all tracked filings.
Where can I see all of Theodore Blegen'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 Theodore Blegen profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.