MPWR
Monolithic Power Systems Inc
NASDAQ: MPWR · TECHNOLOGY · SEMICONDUCTORS
$1,661.10
-10.38% today
Updated 2026-06-05
Market cap
$79.84B
P/E ratio
116.32
P/S ratio
27.00x
EPS (TTM)
$13.97
Dividend yield
0.43%
52W range
$665 – $1,714
Volume
0.6M
Monolithic Power Systems Inc (MPWR) Insider transactions
Net insider activity
Net selling (230,219 shares)
Buy transactions
0
Sell transactions
100
All transactions
| Date | Insider | Title | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-06-01 | SCIAMMAS, MAURICE | EVP, WW Sales & Marketing | Sale | 30 | $1,533.95 | $46018.50 |
| 2026-05-29 | SCIAMMAS, MAURICE | EVP, WW Sales & Marketing | Sale | 12,472 | — | — |
| 2026-05-27 | TSENG, SARIA | EVP & General Counsel | Sale | 7,565 | $1,700.00 | $12.86M |
| 2026-05-26 | ZHOU, JEFF | Director | Sale | 486 | $1,680.00 | $816480.00 |
| 2026-05-26 | DEAN, ROBERT W II | Interim CFO | Sale | 22 | $1,649.56 | $36290.32 |
| 2026-05-22 | TSENG, SARIA | EVP & General Counsel | Sale | 5,000 | $1,586.43 | $7.93M |
| 2026-05-22 | TSENG, SARIA | EVP & General Counsel | Sale | 200 | — | — |
| 2026-05-18 | HSING, MICHAEL | Director, CEO | Sale | 6,688 | $1,486.76 | $9.94M |
| 2026-05-18 | HSING, MICHAEL | Director, CEO | Sale | 5,819 | $1,467.62 | $8.54M |
| 2026-05-18 | HSING, MICHAEL | Director, CEO | Sale | 5,737 | $1,482.51 | $8.51M |
| 2026-05-18 | HSING, MICHAEL | Director, CEO | Sale | 5,049 | $1,472.84 | $7.44M |
| 2026-05-18 | HSING, MICHAEL | Director, CEO | Sale | 4,082 | $1,476.96 | $6.03M |
| 2026-05-18 | HSING, MICHAEL | Director, CEO | Sale | 3,769 | $1,507.70 | $5.68M |
| 2026-05-18 | HSING, MICHAEL | Director, CEO | Sale | 3,424 | $1,462.61 | $5.01M |
| 2026-05-18 | HSING, MICHAEL | Director, CEO | Sale | 2,929 | $1,503.05 | $4.40M |
| 2026-05-18 | HSING, MICHAEL | Director, CEO | Sale | 862 | $1,491.48 | $1.29M |
| 2026-05-18 | HSING, MICHAEL | Director, CEO | Sale | 608 | $1,499.46 | $911671.68 |
| 2026-05-18 | HSING, MICHAEL | Director, CEO | Sale | 551 | $1,513.11 | $833723.61 |
| 2026-05-18 | HSING, MICHAEL | Director, CEO | Sale | 352 | $1,518.15 | $534388.80 |
| 2026-05-18 | HSING, MICHAEL | Director, CEO | Sale | 130 | $1,521.43 | $197785.90 |
| 2026-05-18 | DEAN, ROBERT W II | Interim CFO | Sale | 4 | $1,563.28 | $6253.12 |
| 2026-05-15 | SCIAMMAS, MAURICE | EVP, WW Sales & Marketing | Sale | 3,741 | $1,550.36 | $5.80M |
| 2026-05-15 | SCIAMMAS, MAURICE | EVP, WW Sales & Marketing | Sale | 2,020 | $1,567.15 | $3.17M |
| 2026-05-15 | SCIAMMAS, MAURICE | EVP, WW Sales & Marketing | Sale | 2,010 | $1,562.01 | $3.14M |
| 2026-05-15 | SCIAMMAS, MAURICE | EVP, WW Sales & Marketing | Sale | 1,717 | $1,557.48 | $2.67M |
| 2026-05-15 | SCIAMMAS, MAURICE | EVP, WW Sales & Marketing | Sale | 1,312 | $1,571.49 | $2.06M |
| 2026-05-15 | SCIAMMAS, MAURICE | EVP, WW Sales & Marketing | Sale | 703 | $1,577.75 | $1.11M |
| 2026-05-15 | SCIAMMAS, MAURICE | EVP, WW Sales & Marketing | Sale | 447 | $1,582.21 | $707247.87 |
| 2026-05-15 | SCIAMMAS, MAURICE | EVP, WW Sales & Marketing | Sale | 50 | $1,585.51 | $79275.50 |
| 2026-05-13 | SCIAMMAS, MAURICE | EVP, WW Sales & Marketing | Sale | 1,563 | — | — |
| 2026-05-13 | DEAN, ROBERT W II | Interim CFO | Sale | 2,156 | — | — |
| 2026-05-06 | ZHOU, JEFF | Director | Sale | 500 | $1,650.00 | $825000.00 |
| 2026-05-06 | XIAO, DEMING | EVP, Global Operations | Sale | 14,167 | $1,652.80 | $23.42M |
| 2026-05-06 | XIAO, DEMING | EVP, Global Operations | Sale | 11,597 | $1,657.93 | $19.23M |
| 2026-05-06 | XIAO, DEMING | EVP, Global Operations | Sale | 3,329 | $1,648.38 | $5.49M |
| 2026-05-06 | XIAO, DEMING | EVP, Global Operations | Sale | 907 | $1,661.38 | $1.51M |
| 2026-05-06 | WYNNE, EILEEN | Director | Sale | 335 | $1,582.68 | $530197.80 |
| 2026-05-06 | ELMIGER, EUGEN J | Director | Sale | 2,619 | $1,596.42 | $4.18M |
| 2026-05-06 | ELMIGER, EUGEN J | Director | Sale | 2,587 | $1,586.81 | $4.11M |
| 2026-05-06 | ELMIGER, EUGEN J | Director | Sale | 1,879 | $1,581.81 | $2.97M |
| 2026-05-06 | ELMIGER, EUGEN J | Director | Sale | 1,355 | $1,591.38 | $2.16M |
| 2026-05-06 | ELMIGER, EUGEN J | Director | Sale | 1,078 | $1,571.58 | $1.69M |
| 2026-05-06 | ELMIGER, EUGEN J | Director | Sale | 834 | $1,575.57 | $1.31M |
| 2026-05-06 | ELMIGER, EUGEN J | Director | Sale | 814 | $1,566.36 | $1.28M |
| 2026-05-06 | ELMIGER, EUGEN J | Director | Sale | 514 | $1,600.14 | $822471.96 |
| 2026-05-06 | ELMIGER, EUGEN J | Director | Sale | 320 | $1,559.88 | $499161.60 |
| 2026-05-05 | ZHOU, JEFF | Director | Sale | 514 | $1,574.48 | $809282.72 |
| 2026-05-05 | ZHOU, JEFF | Director | Sale | 500 | $1,600.00 | $800000.00 |
| 2026-05-05 | SCIAMMAS, MAURICE | EVP, WW Sales & Marketing | Sale | 380 | $1,583.81 | $601847.80 |
| 2026-05-04 | SCIAMMAS, MAURICE | EVP, WW Sales & Marketing | Sale | 30 | $1,588.73 | $47661.90 |
| 2026-04-08 | TSENG, SARIA | EVP & General Counsel | Sale | 4,244 | $1,312.82 | $5.57M |
| 2026-04-08 | TSENG, SARIA | EVP & General Counsel | Sale | 1,279 | $1,308.30 | $1.67M |
| 2026-04-08 | TSENG, SARIA | EVP & General Counsel | Sale | 840 | $1,319.25 | $1.11M |
| 2026-04-08 | TSENG, SARIA | EVP & General Counsel | Sale | 800 | $1,302.52 | $1.04M |
| 2026-04-08 | TSENG, SARIA | EVP & General Counsel | Sale | 560 | $1,266.48 | $709228.80 |
| 2026-04-08 | TSENG, SARIA | EVP & General Counsel | Sale | 400 | $1,292.08 | $516832.00 |
| 2026-04-08 | TSENG, SARIA | EVP & General Counsel | Sale | 360 | $1,270.29 | $457304.40 |
| 2026-04-08 | TSENG, SARIA | EVP & General Counsel | Sale | 240 | $1,279.55 | $307092.00 |
| 2026-04-08 | TSENG, SARIA | EVP & General Counsel | Sale | 120 | $1,321.94 | $158632.80 |
| 2026-04-06 | TSENG, SARIA | EVP & General Counsel | Sale | 2,036 | $1,170.38 | $2.38M |
| 2026-04-06 | TSENG, SARIA | EVP & General Counsel | Sale | 1,680 | $1,176.35 | $1.98M |
| 2026-04-06 | TSENG, SARIA | EVP & General Counsel | Sale | 1,396 | $1,179.50 | $1.65M |
| 2026-04-06 | TSENG, SARIA | EVP & General Counsel | Sale | 684 | $1,165.66 | $797311.44 |
| 2026-04-06 | TSENG, SARIA | EVP & General Counsel | Sale | 560 | $1,159.62 | $649387.20 |
| 2026-04-06 | TSENG, SARIA | EVP & General Counsel | Sale | 556 | $1,144.42 | $636297.52 |
| 2026-04-06 | TSENG, SARIA | EVP & General Counsel | Sale | 480 | $1,149.05 | $551544.00 |
| 2026-04-06 | TSENG, SARIA | EVP & General Counsel | Sale | 244 | $1,139.96 | $278150.24 |
| 2026-04-01 | TSENG, SARIA | EVP & General Counsel | Sale | 576 | $1,131.24 | $651594.24 |
| 2026-04-01 | TSENG, SARIA | EVP & General Counsel | Sale | 292 | $1,136.99 | $332001.08 |
| 2026-04-01 | TSENG, SARIA | EVP & General Counsel | Sale | 188 | $1,135.91 | $213551.08 |
| 2026-04-01 | TSENG, SARIA | EVP & General Counsel | Sale | 184 | $1,132.15 | $208315.60 |
| 2026-04-01 | TSENG, SARIA | EVP & General Counsel | Sale | 160 | $1,134.14 | $181462.40 |
| 2026-04-01 | SCIAMMAS, MAURICE | EVP, WW Sales & Marketing | Sale | 30 | $1,116.44 | $33493.20 |
| 2026-03-30 | TSENG, SARIA | EVP & General Counsel | Sale | 9,080 | $1,005.18 | $9.13M |
| 2026-03-30 | TSENG, SARIA | EVP & General Counsel | Sale | 5,154 | $1,000.81 | $5.16M |
| 2026-03-30 | TSENG, SARIA | EVP & General Counsel | Sale | 3,360 | $1,009.63 | $3.39M |
| 2026-03-30 | TSENG, SARIA | EVP & General Counsel | Sale | 3,194 | $1,017.22 | $3.25M |
| 2026-03-30 | TSENG, SARIA | EVP & General Counsel | Sale | 2,440 | $1,029.21 | $2.51M |
| 2026-03-30 | TSENG, SARIA | EVP & General Counsel | Sale | 2,200 | $1,023.00 | $2.25M |
| 2026-03-30 | TSENG, SARIA | EVP & General Counsel | Sale | 166 | $1,035.60 | $171909.60 |
| 2026-03-30 | TSENG, SARIA | EVP & General Counsel | Sale | 80 | $1,041.12 | $83289.60 |
| 2026-03-20 | SCIAMMAS, MAURICE | EVP, WW Sales & Marketing | Sale | 30 | $1,095.07 | $32852.10 |
| 2026-02-12 | HSING, MICHAEL | Director, CEO | Sale | 12,731 | $1,155.71 | $14.71M |
| 2026-02-12 | HSING, MICHAEL | Director, CEO | Sale | 4,992 | $1,159.84 | $5.79M |
| 2026-02-12 | HSING, MICHAEL | Director, CEO | Sale | 4,001 | $1,164.92 | $4.66M |
| 2026-02-12 | HSING, MICHAEL | Director, CEO | Sale | 3,640 | $1,205.82 | $4.39M |
| 2026-02-12 | HSING, MICHAEL | Director, CEO | Sale | 2,076 | $1,168.80 | $2.43M |
| 2026-02-12 | HSING, MICHAEL | Director, CEO | Sale | 1,440 | $1,200.81 | $1.73M |
| 2026-02-12 | HSING, MICHAEL | Director, CEO | Sale | 1,240 | $1,210.11 | $1.50M |
| 2026-02-12 | HSING, MICHAEL | Director, CEO | Sale | 600 | $1,194.34 | $716604.00 |
| 2026-02-12 | HSING, MICHAEL | Director, CEO | Sale | 480 | $1,180.79 | $566779.20 |
| 2026-02-12 | HSING, MICHAEL | Director, CEO | Sale | 200 | $1,173.39 | $234678.00 |
| 2026-02-12 | HSING, MICHAEL | Director, CEO | Sale | 160 | $1,188.23 | $190116.80 |
| 2026-02-11 | SCIAMMAS, MAURICE | EVP, WW Sales & Marketing | Sale | 200 | $1,179.98 | $235995.00 |
| 2026-02-11 | HSING, MICHAEL | Director, CEO | Sale | 14,578 | $1,197.20 | $17.45M |
| 2026-02-11 | HSING, MICHAEL | Director, CEO | Sale | 6,079 | $1,192.67 | $7.25M |
| 2026-02-11 | HSING, MICHAEL | Director, CEO | Sale | 2,799 | $1,177.67 | $3.30M |
| 2026-02-11 | HSING, MICHAEL | Director, CEO | Sale | 2,104 | $1,188.17 | $2.50M |
| 2026-02-11 | HSING, MICHAEL | Director, CEO | Sale | 1,987 | $1,172.92 | $2.33M |
| 2026-02-11 | HSING, MICHAEL | Director, CEO | Sale | 1,542 | $1,182.82 | $1.82M |
Frequently asked questions
Are MPWR insiders buying or selling?
Over the transactions on record, MPWR insiders have been net sellers, with about $291.88M in stock sold across 100 sales. The entries tagged as buys are stock grants and option exercises recorded at $0, not open-market purchases.
Does insider selling at MPWR mean the stock will fall?
Not by itself. Most executive selling is pre-scheduled through 10b5-1 plans filed months in advance, and insiders sell for diversification, taxes, and liquidity far more often than out of any view on the price. Insider buying is the stronger signal, especially when several insiders buy around the same time, because there is usually only one reason to put personal cash into the stock.
Which MPWR insiders are selling the most?
Recent selling is concentrated in a few names. HSING, MICHAEL accounts for the largest share on record, with about $130.88M sold. Selling by one or two individuals matters less than broad selling across the whole leadership team, which is the pattern worth watching.