Form 4 for MPWR Monolithic Power Systems
Accepted 2026-04-03 17:36:18 ET · period of report 2026-04-01 · accession 0001214659-26-004341 · 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 | 2026-04-03 17:36 | 2026-04-01 | MPWR | Tseng Saria | EVP, GC | S - Sale | $1,133.52 | -1,400 | 173.6K | -0.8% | -$1.59M |
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 | 2026-04-01 | S | D | 576 | $1,131.24 | 174,406 | 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 $1,130.82 to $1,131.76. 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. |
| 2 | Common | Common Stock | 2026-04-01 | S | D | 184 | $1,132.15 | 174,222 | 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 $1,131.84 to $1,132.46. 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 | 2026-04-01 | S | D | 160 | $1,134.14 | 174,062 | 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 $1,133.77 to $1,134.75. 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 | 2026-04-01 | S | D | 188 | $1,135.91 | 173,874 | 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 $1,135.41 to $1,136.26. 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 | 2026-04-01 | S | D | 292 | $1,136.99 | 173,582 | 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 $1,136.47 to $1,137.71. 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. |