Form 4 for MPWR Monolithic Power Systems
Accepted 2026-05-19 19:09:36 ET · period of report 2026-05-15 · accession 0001214659-26-006583 · 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 | 2026-05-19 19:09 | 2026-05-15 | MPWR | Sciammas Maurice | EVP, WW Sales, Marketing | S - Sale | $1,561.40 | -12.0K | 166.6K | -7% | -$18.74M |
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 | 2026-05-15 | S | D | 3,741 | $1,550.36 | 174,903 | 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 $1,549.62 to $1,554.55. 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 | 2026-05-15 | S | D | 1,717 | $1,557.48 | 173,186 | 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 $1,554.59 to $1,559.37. 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 | 2026-05-15 | S | D | 2,010 | $1,562.01 | 171,176 | 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 $1,559.61 to $1,564.59. 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 | 2026-05-15 | S | D | 2,020 | $1,567.15 | 169,156 | 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 $1,564.75 to $1,569.67. 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. |
| 5 | Common | Common Stock | 2026-05-15 | S | D | 1,312 | $1,571.49 | 167,844 | 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 $1,569.78 to $1,574.53. 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. |
| 6 | Common | Common Stock | 2026-05-15 | S | D | 703 | $1,577.75 | 167,141 | 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 $1,574.9 to $1,579.7. 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 | 2026-05-15 | S | D | 447 | $1,582.21 | 166,694 | 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 $1,579.97 to $1,584.43. 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 | 2026-05-15 | S | D | 50 | $1,585.51 | 166,644 | 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 $1,585.17 to $1,586.76. 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. |