Form 4 for MPWR Monolithic Power Systems
Accepted 2025-11-20 00:00:00 ET · period of report 2025-11-19 · accession 0001214659-25-017016 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M | 2025-11-20 | 2025-11-19 | MPWR | Sciammas Maurice | EVP, WW Sales, Marketing | S - Sale | $881.66 | -28.0K | 165.3K | -14% | -$24.66M |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock | 2025-11-19 | S | D | 1,738 | $885.10 | 149,116 | D | — | — | (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 $885.00 to $885.99. 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. |
| 2 | Common | Common Stock | 2025-11-19 | S | D | 2,149 | $884.44 | 150,854 | D | — | — | (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 $884.00 to $884.69. 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. |
| 3 | Common | Common Stock | 2025-11-19 | S | D | 6,513 | $883.50 | 153,003 | D | — | — | (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 $883.00 to $883.93. 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. |
| 4 | Common | Common Stock | 2025-11-19 | S | D | 3,344 | $882.51 | 159,516 | D | — | — | (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 $882.06 to $882.92. 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. |
| 5 | Common | Common Stock | 2025-11-19 | S | D | 2,469 | $881.42 | 162,860 | D | — | — | (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 $881.01 to $881.93. 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. |
| 6 | Common | Common Stock | 2025-11-19 | S | D | 810 | $886.01 | 148,306 | D | — | — | (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 $886.00 to $886.15. 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. |
| 7 | Common | Common Stock | 2025-11-19 | S | D | 1,966 | $879.54 | 169,105 | D | — | — | (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 $879.25 to $879.99. 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. |
| 8 | Common | Common Stock | 2025-11-19 | S | D | 1,854 | $878.55 | 171,071 | D | — | — | (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 $878.00 to $878.97. 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. |
| 9 | Common | Common Stock | 2025-11-19 | S | D | 1,976 | $877.45 | 172,925 | D | — | — | (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 $877.00 to $877.97. 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. |
| 10 | Common | Common Stock | 2025-11-19 | S | D | 940 | $876.62 | 174,901 | D | — | — | (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 $876.28 to $876.97. 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. |
| 11 | Common | Common Stock | 2025-11-19 | S | D | 431 | $875.26 | 175,841 | D | — | — | (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 $875.01 to $875.95. 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. |
| 12 | Common | Common Stock | 2025-11-19 | S | D | 3,776 | $880.58 | 165,329 | D | — | — | (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 $880.07 to $880.94. 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. |