Tseng Saria's Form 4 filing
Monolithic Power Systems, Inc. (MPWR) · filed Nov 28, 2025
- Accession no.
- 0001214659-25-017303
- Filed
- Nov 28, 2025
- Trade date
- Nov 25, 2025
- Filing delay
- 3 days
- Rule 10b5-1 plan
- Not checked
This filing lists 19 non-derivative transactions. Open-market sales total $18.1M. It was filed 3 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 |
|---|---|
| Tseng SariaCIK 0001312593 | Officer (EVP & General Counsel) |
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 |
|---|---|---|---|---|---|---|---|---|
| Nov 25, 2025 | Common Stock | SSaleDisposed | −385 | $894.54F1 | −$344,397.9 | 206,946 | Direct | |
| Nov 25, 2025 | Common Stock | SSaleDisposed | −1,625 | $895.63F2 | −$1,455,398.75 | 205,321 | Direct | |
| Nov 25, 2025 | Common Stock | SSaleDisposed | −2,066 | $896.37F3 | −$1,851,900.42 | 203,255 | Direct | |
| Nov 25, 2025 | Common Stock | SSaleDisposed | −754 | $897.54F4 | −$676,745.16 | 202,501 | Direct | |
| Nov 25, 2025 | Common Stock | SSaleDisposed | −145 | $898.38F5 | −$130,265.1 | 202,356 | Direct | |
| Nov 25, 2025 | Common Stock | SSaleDisposed | −320 | $899.37F6 | −$287,798.4 | 202,036 | Direct | |
| Nov 25, 2025 | Common Stock | SSaleDisposed | −346 | $900.41F7 | −$311,541.86 | 201,690 | Direct | |
| Nov 25, 2025 | Common Stock | SSaleDisposed | −880 | $901.58F8 | −$793,390.4 | 200,810 | Direct | |
| Nov 25, 2025 | Common Stock | SSaleDisposed | −120 | $902.07F9 | −$108,248.4 | 200,690 | Direct | |
| Nov 25, 2025 | Common Stock | SSaleDisposed | −160 | $903.54F10 | −$144,566.4 | 200,530 | Direct | |
| Nov 25, 2025 | Common Stock | SSaleDisposed | −200 | $904.39F11 | −$180,878 | 200,330 | Direct | |
| Nov 25, 2025 | Common Stock | SSaleDisposed | −160 | $905.32F12 | −$144,851.2 | 200,170 | Direct | |
| Nov 25, 2025 | Common Stock | SSaleDisposed | −272 | $906.33F13 | −$246,521.76 | 199,898 | Direct | |
| Nov 25, 2025 | Common Stock | SSaleDisposed | −10,200 | $907.21F14 | −$9,253,542 | 189,698 | Direct | |
| Nov 25, 2025 | Common Stock | SSaleDisposed | −888 | $908.49F15 | −$806,739.12 | 188,810 | Direct | |
| Nov 25, 2025 | Common Stock | SSaleDisposed | −556 | $909.35F16 | −$505,598.6 | 188,254 | Direct | |
| Nov 25, 2025 | Common Stock | SSaleDisposed | −359 | $910.42F17 | −$326,840.78 | 187,895 | Direct | |
| Nov 25, 2025 | Common Stock | SSaleDisposed | −324 | $911.92F18 | −$295,462.08 | 187,571 | Direct | |
| Nov 25, 2025 | Common Stock | SSaleDisposed | −240 | $912.30F19 | −$218,952 | 187,331 | 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.
- F1
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 $894.17 to $894.81. 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.
- 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 $895.14 to $895.89. 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 $896.01 to $896.98. 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 $897.32 to $897.83. 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 $898.05 to $898.56. 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 $899.01 to $899.90. 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 $900.02 to $900.90. 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 $901.22 to $901.94. 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 $902.01 to $902.14. 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 $903.36 to $903.72. 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 $904.12 to $904.81. 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 $905.07 to $905.53. 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 $906.14 to $906.67. 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 $907.20 to $907.73. 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.
- F15
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 $908.02 to $908.89. 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.
- F16
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 $909.02 to $909.74. 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.
- F17
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 $910.01 to $910.96. 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.
- F18
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 $911.85 to $911.95. 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.
- F19
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 $912.12 to $912.48. 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.