Form 4 for MPWR Monolithic Power Systems
Accepted 2025-08-18 00:00:00 ET · period of report 2025-08-15 · accession 0001214659-25-012411 · 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 | 2025-08-18 | 2025-08-15 | MPWR | Hsing Michael | CEO, Dir | S - Sale | $829.10 | -20.2K | 819.3K | -2% | -$16.77M |
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 | 2025-08-15 | S | D | 535 | $833.37 | 815,267 | 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 $833.20 to $833.50. 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 | 2025-08-15 | S | D | 1,510 | $832.57 | 815,802 | 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 $832.05 to $832.90. 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. |
| 3 | Common | Common Stock | 2025-08-15 | S | D | 200 | $834.92 | 815,067 | D | — | — | |
| 4 | Common | Common Stock | 2025-08-15 | S | D | 400 | $836.40 | 814,667 | 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 $836.11 to $836.50. 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 | 2025-08-15 | S | D | 1,953 | $831.57 | 817,312 | 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 $831.00 to $831.87. 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 | 2025-08-15 | S | D | 2,603 | $825.69 | 832,295 | 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 $825.06 to $825.86. 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. |
| 7 | Common | Common Stock | 2025-08-15 | S | D | 4,101 | $829.45 | 821,365 | 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 $829.23 to $829.86. 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. |
| 8 | Common | Common Stock | 2025-08-15 | S | D | 396 | $828.64 | 825,466 | 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 $828.07 to $828.84. 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. |
| 9 | Common | Common Stock | 2025-08-15 | S | D | 3,878 | $827.72 | 825,862 | 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 $827.06 to $827.98. 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. |
| 10 | Common | Common Stock | 2025-08-15 | S | D | 2,555 | $826.64 | 829,740 | 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 $826.12 to $826.98. 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. |
| 11 | Common | Common Stock | 2025-08-15 | S | D | 2,100 | $830.46 | 819,265 | 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 $830.01 to $830.97. 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. |