Key facts
- This page summarizes Theodore Blegen's Form 4 filing for MONOLITHIC POWER SYSTEMS INC (MPWR).
- 1 reported transaction and 0 derivative rows are listed below.
- Accepted by SEC: 10 Feb 2026, 18:57.
Theodore Blegen - 06 Feb 2026 Form 4 Insider Report for MONOLITHIC POWER SYSTEMS INC (MPWR)
- Reporting relationship
- EVP and CFO
- Issuer ticker
- MPWR
- Reported as of
- 06 Feb 2026
- Net transaction value
- -$25,443,531
- SEC form
- 4
- Accepted by SEC
- 10 Feb 2026, 18:57:08 UTC
- Prior SEC filing
- 05 Feb 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Saria Tseng, attorney-in-fact for Mr. Bernie Blegen
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
Theodore Blegen filed Form 4 for MONOLITHIC POWER SYSTEMS INC (MPWR) on 10 Feb 2026.
Change
- Previous filing in this sequence was filed on 05 Feb 2026.
- Current net transaction value: -$25,443,531.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001415033
Primary reporting owner
BLEGEN THEODORE
- Relationship
- EVP and CFO
- Address
- 1555 PALM BEACH LAKES BLVD., WEST PALM BEACH
- Signature
- /s/ Saria Tseng, attorney-in-fact for Mr. Bernie Blegen
- Signature date
- 10 Feb 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
MPWR
transaction
Common Stock
Sale
- Transaction value
- $25,443,531
- Shares
- -21,725
- Change %
- -21%
- Price
- $1171.16
- Shares after
- 82,353
- Date
- 06 Feb 2026
- Ownership
- Direct
- Footnotes
- F1
MPWR
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 5,331
- Date
- 06 Feb 2026
- Ownership
- Irrevocable Trust FBO Sarah N. Blegen
MPWR
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 5,331
- Date
- 06 Feb 2026
- Ownership
- Irrevocable Trust FBO Theodore F. Blegen
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 1 footnote
Footnote F1
The reported sales were to cover taxes upon the release of restricted stock units, as required by the Company's equity incentive plan.