Form 4 for MPWR Monolithic Power Systems
Accepted 2026-07-17 17:43:36 ET · period of report 2026-07-15 · accession 0001214659-26-008703 · 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MT | 2026-07-17 17:43 | 2026-07-15 | MPWR | Sciammas Maurice | EVP, WW Sales, Marketing | S - Sale | $1,349.73 | -15.0K | 151.6K | -9% | -$20.25M |
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 | 2026-07-15 | S | D | 527 | $1,314.03 | 166,117 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. (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 $1,311.45 to $1,316.40 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 | 2026-07-15 | S | D | 274 | $1,318.42 | 165,843 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. (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 $1,316.56 to $1,321.56. 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. |
| 3 | Common | Common Stock | 2026-07-15 | S | D | 409 | $1,323.93 | 165,434 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. (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 $1,321.72 to $1,326.11. 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 | 2026-07-15 | S | D | 464 | $1,329.30 | 164,970 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. (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 $1,326.94 to $1,331.90. 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. |
| 5 | Common | Common Stock | 2026-07-15 | S | D | 776 | $1,334.59 | 164,194 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. (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 $1,331.95 to $1,336.95. 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. |
| 6 | Common | Common Stock | 2026-07-15 | S | D | 1,460 | $1,339.59 | 162,734 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. (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 $1,336.97 to $1,341.96. 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. |
| 7 | Common | Common Stock | 2026-07-15 | S | D | 1,864 | $1,344.16 | 160,870 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. (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 $1,341.99 to $1,346.96. 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. |
| 8 | Common | Common Stock | 2026-07-15 | S | D | 1,506 | $1,348.91 | 159,364 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. (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 $1,347.09 to $1,352.00. 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 | 2026-07-15 | S | D | 5,640 | $1,352.95 | 153,724 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. (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 $1,352.13 to $1,357.03. 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 | 2026-07-15 | S | D | 50 | $1,359.36 | 153,674 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. (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 $1,357.88 to $1,362.57. 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 | 2026-07-15 | S | D | 240 | $1,369.18 | 153,434 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. (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 $1,366.15 to $1,371.04. 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 | 2026-07-15 | S | D | 472 | $1,375.47 | 152,962 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. (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 $1,371.23 to $1,376.20. 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. |
| 13 | Common | Common Stock | 2026-07-15 | S | D | 418 | $1,378.73 | 152,544 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. (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 $1,376.51 to $1,381.11. 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. |
| 14 | Common | Common Stock | 2026-07-15 | S | D | 410 | $1,384.11 | 152,134 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. (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 $1,381.79 to $1,386.22. 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. |
| 15 | Common | Common Stock | 2026-07-15 | S | D | 50 | $1,388.19 | 152,084 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. (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 $1,388.18 to $1,388.22. 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. |
| 16 | Common | Common Stock | 2026-07-15 | S | D | 213 | $1,396.16 | 151,871 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. (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 $1,393.94 to $1,398.92. 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. |
| 17 | Common | Common Stock | 2026-07-15 | S | D | 117 | $1,400.45 | 151,754 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. (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 $1,398.97 to $1,400.85. 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. |
| 18 | Common | Common Stock | 2026-07-15 | S | D | 110 | $1,405.71 | 151,644 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. (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 $1,404.25 to $1,406.04. 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. |