Form 4 for MPWR Monolithic Power Systems
Accepted 2026-04-10 12:46:56 ET · period of report 2026-04-08 · accession 0001214659-26-004535 · 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 | 2026-04-10 12:46 | 2026-04-08 | MPWR | Tseng Saria | EVP, GC | S - Sale | $1,305.22 | -8,963 | 157.0K | -5% | -$11.70M |
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 | 2026-04-08 | S | D | 560 | $1,266.48 | 165,386 | 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 $1,264.04 to $1,268.56. 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. |
| 2 | Common | Common Stock | 2026-04-08 | S | D | 360 | $1,270.29 | 165,026 | 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 $1,269.36 to $1,272.23. 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 | 2026-04-08 | S | D | 240 | $1,279.55 | 164,786 | 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 $1,277.78 to $1,281.49. 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 | 2026-04-08 | S | D | 120 | $1,287.12 | 164,666 | 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 $1,284.26 to $1,289.24. 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 | 2026-04-08 | S | D | 400 | $1,292.08 | 164,266 | 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 $1,290.95 to $1,294.78. 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 | 2026-04-08 | S | D | 800 | $1,302.52 | 163,466 | 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 $1,299.99 to $1,304.82. 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 | 2026-04-08 | S | D | 1,279 | $1,308.30 | 162,187 | 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 $1,305.08 to $1,310.00. 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. |
| 8 | Common | Common Stock | 2026-04-08 | S | D | 4,244 | $1,312.82 | 157,943 | 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 $1,310.27 to $1,315.08. 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. |
| 9 | Common | Common Stock | 2026-04-08 | S | D | 840 | $1,319.25 | 157,103 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 trading plan adopted on 11/28/2025. (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 $1,316.25 to $1,321.04. 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. |
| 10 | Common | Common Stock | 2026-04-08 | S | D | 120 | $1,321.94 | 156,983 | D | — | — | (F1) These transactions were made pursuant to a Rule 10b5-1 trading plan adopted on 11/28/2025. (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 $1,321.50 to $1,322.56. 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. |