Blegen Theodore's Form 4 filing
Monolithic Power Systems, Inc. (MPWR) · filed Feb 4, 2026
- Accession no.
- 0001214659-26-001149
- Filed
- Feb 4, 2026
- Trade date
- Feb 2, 2026
- Filing delay
- 2 days
- Rule 10b5-1 plan
- Checked
This filing lists 17 non-derivative transactions. Open-market sales total $3.39M. It was filed 2 days after the trade.
Reporting owners
A Form 4 can have several reporting owners, such as a person and a fund they control. Trade tables show the first one.
| Owner | Relationship to the company |
|---|---|
| Blegen TheodoreCIK 0001415033 | Officer (EVP and CFO) |
Non-derivative securities (Table I)
Acquisitions and disposals of common stock and similar shares, one row per line on the filing.
| Trade date | Security | Transaction | Shares | Price | Value | Shares after | Ownership | Flags |
|---|---|---|---|---|---|---|---|---|
| Feb 2, 2026 | Common Stock | SSaleDisposed | −220 | $1,110.58F2 | −$244,327.6 | 68,112 | Direct | |
| Feb 2, 2026 | Common Stock | SSaleDisposed | −40 | $1,117.11 | −$44,684.4 | 68,072 | Direct | |
| Feb 2, 2026 | Common Stock | SSaleDisposed | −80 | $1,120.77 | −$89,661.6 | 67,992 | Direct | |
| Feb 2, 2026 | Common Stock | SSaleDisposed | −40 | $1,122.56 | −$44,902.4 | 67,952 | Direct | |
| Feb 2, 2026 | Common Stock | SSaleDisposed | −200 | $1,126.58F3 | −$225,316 | 67,752 | Direct | |
| Feb 2, 2026 | Common Stock | SSaleDisposed | −80 | $1,127.39F4 | −$90,191.2 | 67,672 | Direct | |
| Feb 2, 2026 | Common Stock | SSaleDisposed | −240 | $1,128.43F5 | −$270,823.2 | 67,432 | Direct | |
| Feb 2, 2026 | Common Stock | SSaleDisposed | −240 | $1,129.28F6 | −$271,027.2 | 67,192 | Direct | |
| Feb 2, 2026 | Common Stock | SSaleDisposed | −320 | $1,130.48F7 | −$361,753.6 | 66,872 | Direct | |
| Feb 2, 2026 | Common Stock | SSaleDisposed | −198 | $1,131.70F8 | −$224,076.6 | 66,674 | Direct | |
| Feb 2, 2026 | Common Stock | SSaleDisposed | −322 | $1,132.67F9 | −$364,719.74 | 66,352 | Direct | |
| Feb 2, 2026 | Common Stock | SSaleDisposed | −379 | $1,133.47F10 | −$429,585.13 | 65,973 | Direct | |
| Feb 2, 2026 | Common Stock | SSaleDisposed | −241 | $1,134.41F11 | −$273,392.81 | 65,732 | Direct | |
| Feb 2, 2026 | Common Stock | SSaleDisposed | −120 | $1,135.49F12 | −$136,258.8 | 65,612 | Direct | |
| Feb 2, 2026 | Common Stock | SSaleDisposed | −120 | $1,136.35F13 | −$136,362 | 65,492 | Direct | |
| Feb 2, 2026 | Common Stock | SSaleDisposed | −80 | $1,137.81 | −$91,024.8 | 65,412 | Direct | |
| Feb 2, 2026 | Common Stock | SSaleDisposed | −80 | $1,139.49F14 | −$91,159.2 | 65,333 | Direct |
Footnotes and remarks
Livermore keeps the footnotes that transaction prices refer to, all footnotes of amendments (Form 4/A) and the filing's remarks. Other footnotes, such as how indirect holdings are held or the details of a trading plan, are only in the original on SEC EDGAR.
- F2
The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,110.14 to $1,110.68. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
Referenced by the price of 1 transaction in Table I.
- F3
The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,126.50 to $1,126.71. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
Referenced by the price of 1 transaction in Table I.
- F4
The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,127.28 to $1,127.49. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
Referenced by the price of 1 transaction in Table I.
- F5
The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,128.32 to $1,128.64. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
Referenced by the price of 1 transaction in Table I.
- F6
The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,129.07 to $1,129.60. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
Referenced by the price of 1 transaction in Table I.
- F7
The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,130.18 to $1,130.95. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
Referenced by the price of 1 transaction in Table I.
- F8
The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,131.38 to $1,131.91. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
Referenced by the price of 1 transaction in Table I.
- F9
The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,132.33 to $1,132.84. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
Referenced by the price of 1 transaction in Table I.
- F10
The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,133.00 to $1,133.86. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
Referenced by the price of 1 transaction in Table I.
- F11
The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,134.00 to $1,134.78. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
Referenced by the price of 1 transaction in Table I.
- F12
The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,135.09 to $1,135.71. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
Referenced by the price of 1 transaction in Table I.
- F13
The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,136.18 to $1,136.69. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
Referenced by the price of 1 transaction in Table I.
- F14
The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,139.44 to $1,139.54. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
Referenced by the price of 1 transaction in Table I.