Form 4 for MPWR Monolithic Power Systems
Accepted 2026-04-08 13:42:26 ET · period of report 2026-04-06 · accession 0001214659-26-004460 · 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 | 2026-04-08 13:42 | 2026-04-06 | MPWR | Tseng Saria | EVP, GC | S - Sale | $1,167.95 | -7,636 | 165.9K | -4% | -$8.92M |
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 | 2026-04-06 | S | D | 244 | $1,139.96 | 173,338 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 trading plan adopted on 11/28/2025. (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 $1,136.69 to $1,141.64. 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 | 2026-04-06 | S | D | 556 | $1,144.42 | 172,782 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 trading plan adopted on 11/28/2025. (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 $1,141.91 to $ 1,146.02. 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 | 2026-04-06 | S | D | 480 | $1,149.05 | 172,302 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 trading plan adopted on 11/28/2025. (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 $1,147.58 to $1,152.19. 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 | 2026-04-06 | S | D | 560 | $1,159.62 | 171,742 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 trading plan adopted on 11/28/2025. (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 $1,156.58 to $1,161.42. 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 | 2026-04-06 | S | D | 684 | $1,165.66 | 171,058 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 trading plan adopted on 11/28/2025. (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 $1,163.16 to $1,168.12. 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 | 2026-04-06 | S | D | 2,036 | $1,170.38 | 169,022 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 trading plan adopted on 11/28/2025. (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 $1,168.24 to $ 1,172.42. 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 | 2026-04-06 | S | D | 1,680 | $1,176.35 | 167,342 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 trading plan adopted on 11/28/2025. (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 $1,173.31 to $1,178.29. 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 | 2026-04-06 | S | D | 1,396 | $1,179.50 | 165,946 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 trading plan adopted on 11/28/2025. (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 $1,178.53 to $1,180.83. 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. |