Form 4 for MPWR Monolithic Power Systems
Accepted 2026-02-12 00:00:00 ET · period of report 2026-02-10 · accession 0001214659-26-001587 · 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 | 2026-02-12 | 2026-02-10 | MPWR | Hsing Michael | CEO, Dir | S - Sale | $1,142.28 | -34.0K | 955.4K | -3% | -$38.84M |
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 | 2026-02-10 | S | D | 280 | $1,197.26 | 954,234 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 08/28/2025. |
| 2 | Common | Common Stock | 2026-02-10 | S | D | 880 | $1,176.04 | 954,514 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 08/28/2025. (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 $1,172.65 to $1,177.08. 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 | 2026-02-10 | S | D | 6,325 | $1,136.75 | 977,607 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 08/28/2025. (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 $1,133.92 to $1,138.90. 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. |
| 4 | Common | Common Stock | 2026-02-10 | S | D | 694 | $1,154.96 | 955,754 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 08/28/2025. (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 $1,154.09 to $1,155.86. 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. |
| 5 | Common | Common Stock | 2026-02-10 | S | D | 1,215 | $1,151.11 | 956,448 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 08/28/2025. (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 $1,149.04 to $1,154.00. 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. |
| 6 | Common | Common Stock | 2026-02-10 | S | D | 3,864 | $1,145.90 | 957,663 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 08/28/2025. (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 $1,144.03 to $1,149.00. 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. |
| 7 | Common | Common Stock | 2026-02-10 | S | D | 16,080 | $1,141.88 | 961,527 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 08/28/2025. (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 $1,138.96 to $1,143.96. 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 | 2026-02-10 | S | D | 4,302 | $1,132.01 | 983,932 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 08/28/2025. (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 $1,128.88 to $1,133.86. 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. |
| 9 | Common | Common Stock | 2026-02-10 | S | D | 360 | $1,161.41 | 955,394 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 08/28/2025. (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 $1,159.96 to $1,163.96. 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. |