MPWR
Monolithic Power Systems IncTrades by corporate insiders — officers, directors and holders of more than 10% of the shares — disclosed to the SEC on Forms 3, 4 and 5. Form 4 must be filed within two business days of the trade.
Insider Sentiment Score
Peer-relative 0–100 rank of how aggressively insiders accumulated over the trailing 90 days. See the full ranking.
| Date | Insider | Role | Type | Security | Shares |
|---|---|---|---|---|---|
| 2026-07-01 | Sciammas Maurice |
EVP, WW Sales & Marketing |
Sell↓
Filing footnotes — Common Stock (Indirect)
This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/19/2025. |
Common Stock
(I)
|
30 |
| 2026-06-01 | Sciammas Maurice |
EVP, WW Sales & Marketing |
Sell↓
Filing footnotes — Common Stock (Indirect)
This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/19/2025. |
Common Stock
(I)
|
30 |
| 2026-05-29 | Sciammas Maurice |
EVP, WW Sales & Marketing |
Gift↓
Filing footnotes — Common Stock (Indirect)
The reported transaction involved distributions of securities from the various GRATs, of which the reporting person is a trustee, to individuals who are not immediate family members sharing the same household. No funds were exchanged and no sale of shares occurred in the distributions. Following the completion of the distributions, neither the GRATs nor the reporting person retains any pecuniary interest in the shares. |
Common Stock
(I)
|
12,472 |
| 2026-05-27 | Tseng Saria |
Director |
Sell↓
|
Common Stock
|
7,565 |
| 2026-05-26 | Zhou Jeff |
Director |
Sell↓
|
Common Stock
|
486 |
| 2026-05-26 | DEAN ROBERT W II |
Interim CFO |
Sell↓
Filing footnotes — Common Stock (Direct)
The reported sale was to cover tax withholding obligations upon the vesting of restricted stock units. 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 $1,647.84 to $1,650.16. 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. |
Common Stock
|
22 |
| 2026-05-22 | Tseng Saria |
Director |
Gift↓
Filing footnotes — Common Stock (Direct)
The reported transaction involved a transfer of securities from the reporting person's direct holdings to an individual who is not an immediate family member sharing the same household. No funds were exchanged and no sale of shares occurred in the transfer. Following the completion of the transfer, the reporting person no longer retains any pecuniary interest in the shares. |
Common Stock
|
200 |
| 2026-05-22 | Tseng Saria |
Director |
Sell↓
|
Common Stock
|
5,000 |
| 2026-05-18 | Hsing Michael |
Director, CEO |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,516.26 to $1,519.25. 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. |
Common Stock
|
352 |
| 2026-05-18 | Hsing Michael |
Director, CEO |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,474.95 to $1,479.85. 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. |
Common Stock
|
4,082 |
| 2026-05-18 | Hsing Michael |
Director, CEO |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,459.96 to $1,464.86. 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. Ending balance includes 29 shares acquired on February 17, 2026 through the Company's qualified ESPP program. |
Common Stock
|
3,424 |
| 2026-05-18 | Hsing Michael |
Director, CEO |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $,1495.74 to $1,500.72. 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. |
Common Stock
|
608 |
| 2026-05-18 | DEAN ROBERT W II |
Interim CFO |
Sell↓
Filing footnotes — Common Stock (Direct)
The reported sale was to cover tax withholding obligations upon the vesting of restricted stock units. |
Common Stock
|
4 |
| 2026-05-18 | Hsing Michael |
Director, CEO |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,490.17 to $1,494.10. 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. |
Common Stock
|
862 |
| 2026-05-18 | Hsing Michael |
Director, CEO |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,484.95 to $1,489.73. 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. |
Common Stock
|
6,688 |
| 2026-05-18 | Hsing Michael |
Director, CEO |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,521.33 to $1,521.56. 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. |
Common Stock
|
130 |
| 2026-05-18 | Hsing Michael |
Director, CEO |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,479.99 to $1,484.93. 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. |
Common Stock
|
5,737 |
| 2026-05-18 | Hsing Michael |
Director, CEO |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,464.97 to $1,469.94. 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. |
Common Stock
|
5,819 |
| 2026-05-18 | Hsing Michael |
Director, CEO |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,510.68 to $1,515.44. 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. |
Common Stock
|
551 |
| 2026-05-18 | Hsing Michael |
Director, CEO |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,469.95 to $1,474.94. 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. |
Common Stock
|
5,049 |
| 2026-05-18 | Hsing Michael |
Director, CEO |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,500.75 to $1,505.70. 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. |
Common Stock
|
2,929 |
| 2026-05-18 | Hsing Michael |
Director, CEO |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,505.70 to $1,510.67. 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. |
Common Stock
|
3,769 |
| 2026-05-15 | Sciammas Maurice |
EVP, WW Sales & Marketing |
Sell↓
Filing footnotes — Common Stock (Direct)
This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. 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. |
Common Stock
|
1,717 |
| 2026-05-15 | Sciammas Maurice |
EVP, WW Sales & Marketing |
Sell↓
Filing footnotes — Common Stock (Direct)
This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. 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. |
Common Stock
|
50 |
| 2026-05-15 | Sciammas Maurice |
EVP, WW Sales & Marketing |
Sell↓
Filing footnotes — Common Stock (Direct)
This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. 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. |
Common Stock
|
3,741 |
| 2026-05-15 | Sciammas Maurice |
EVP, WW Sales & Marketing |
Sell↓
Filing footnotes — Common Stock (Direct)
This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. 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. |
Common Stock
|
2,010 |
| 2026-05-15 | Sciammas Maurice |
EVP, WW Sales & Marketing |
Sell↓
Filing footnotes — Common Stock (Direct)
This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. 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. |
Common Stock
|
1,312 |
| 2026-05-15 | Sciammas Maurice |
EVP, WW Sales & Marketing |
Sell↓
Filing footnotes — Common Stock (Direct)
This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. 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. |
Common Stock
|
447 |
| 2026-05-15 | Sciammas Maurice |
EVP, WW Sales & Marketing |
Sell↓
Filing footnotes — Common Stock (Direct)
This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. 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. |
Common Stock
|
2,020 |
| 2026-05-15 | Sciammas Maurice |
EVP, WW Sales & Marketing |
Sell↓
Filing footnotes — Common Stock (Direct)
This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025. 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. |
Common Stock
|
703 |
| 2026-05-13 | Sciammas Maurice |
EVP, WW Sales & Marketing |
Gift↑
Filing footnotes — Common Stock (Indirect)
1,563 shares were received by the Sciammas Family Trust, of which the reporting person is a Trustee, and transferred from three GRATs, of which the reporting person is a Trustee. No funds were exchanged and no sale of shares occurred in the transfer. |
Common Stock
(I)
|
1,563 |
| 2026-05-13 | Sciammas Maurice |
EVP, WW Sales & Marketing |
Gift↓
Filing footnotes — Common Stock (Indirect)
1,563 shares were transferred from three GRATs, of which the reporting person is a Trustee, to the Sciammas Family Trust, of which the reporting person is a Trustee. No funds were exchanged, and no sale of shares occurred in the transfer. |
Common Stock
(I)
|
1,563 |
| 2026-05-13 | DEAN ROBERT W II |
Interim CFO |
Other↓
Filing footnotes — Common Stock (Direct)
The reported transaction involved a transfer of securities from the reporting person's direct holdings to an individual who is not an immediate family member sharing the same household. No funds were exchanged and no sale of shares occurred in the transfer. Following the completion of the transfer, the reporting person no longer retains any pecuniary interest in the shares. |
Common Stock
|
2,156 |
| 2026-05-06 | Xiao Deming |
EVP, Global Operations |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,645.48 to $1,650.43. 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. Ending balance includes 27 shares acquired on February 17, 2026 through the Company's qualified ESPP program. |
Common Stock
|
3,329 |
| 2026-05-06 | Wynne Eileen |
Director |
Sell↓
|
Common Stock
|
335 |
| 2026-05-06 | Elmiger Eugen J |
Director |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,563.39 to $1,568.28. 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. |
Common Stock
|
814 |
| 2026-05-06 | Elmiger Eugen J |
Director |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,557.08 to $1,561.97. 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. |
Common Stock
|
320 |
| 2026-05-06 | Elmiger Eugen J |
Director |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,598.99 to $1,602.68 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. |
Common Stock
|
514 |
| 2026-05-06 | Elmiger Eugen J |
Director |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,588.80 to $1,593.63. 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. |
Common Stock
|
1,355 |
| 2026-05-06 | Xiao Deming |
EVP, Global Operations |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,655.80 to $1,660.72. 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. |
Common Stock
|
11,597 |
| 2026-05-06 | Xiao Deming |
EVP, Global Operations |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,650.75 to $1,655.75. 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. |
Common Stock
|
14,167 |
| 2026-05-06 | Zhou Jeff |
Director |
Sell↓
|
Common Stock
|
500 |
| 2026-05-06 | Elmiger Eugen J |
Director |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,583.79 to $1,588.65. 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. |
Common Stock
|
2,587 |
| 2026-05-06 | Elmiger Eugen J |
Director |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,573.86 to $1,578.73. 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. |
Common Stock
|
834 |
| 2026-05-06 | Elmiger Eugen J |
Director |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,593.95 to $1,598.78. 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. |
Common Stock
|
2,619 |
| 2026-05-06 | Elmiger Eugen J |
Director |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,578.85 to $1,583.66. 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. |
Common Stock
|
1,879 |
| 2026-05-06 | Elmiger Eugen J |
Director |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,568.78 to $1,573.40. 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. |
Common Stock
|
1,078 |
| 2026-05-06 | Xiao Deming |
EVP, Global Operations |
Sell↓
Filing footnotes — Common Stock (Direct)
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 $1,660.99 to $1,662 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. |
Common Stock
|
907 |
| 2026-05-05 | Sciammas Maurice |
EVP, WW Sales & Marketing |
Sell↓
|
Common Stock
(I)
|
380 |
| 2026-05-05 | Zhou Jeff |
Director |
Sell↓
|
Common Stock
|
514 |