Kuo Wei Herbert Chang
CIK 1192171 · View on SEC EDGAR ↗
Insider
First SEC filing: Aug. 26, 2005 · Latest: Aug. 26, 2005
On this page
Insider at
Insider transactions
0 buys (P)
3 sells (S)
Net:
$-248,094
+ 42 non-open-market transactions below
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
42 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Aug. 11, 2026 | MPWR | S | 50 | $1420.00 | $71,000 | 565 Direct | -8.13% | Disposed | -7.8% (price as of 2026-08-20) |
| Nov. 25, 2025 | MPWR | S | 100 | $896.97 | $89,697 | 426 Direct | -19.01% | Disposed | 46.0% (price as of 2026-08-20) |
| Nov. 21, 2025 | MPWR | S | 100 | $873.97 | $87,397 | 526 Direct | -15.97% | Disposed | 49.8% (price as of 2026-08-20) |
| May 13, 2025 | MPWR | S | 50 | $738.00 | $36,900 | 626 Direct | -7.40% | Disposed | 77.4% (price as of 2026-08-20) |
| May 12, 2025 | MPWR | S | 100 | $698.00 | $69,800 | 676 Direct | -12.89% | Disposed | 87.6% (price as of 2026-08-20) |
| May 8, 2025 | MPWR | S | 100 | $650.00 | $65,000 | 776 Direct | -11.42% | Disposed | 101.5% (price as of 2026-08-20) |
| Aug. 15, 2024 | MPWR | S | 100 | $898.00 | $89,800 | 541 Direct | -15.60% | Disposed | 45.8% (price as of 2026-08-20) |
| Aug. 15, 2024 | MPWR | S | 100 | $888.88 | $88,888 | 641 Direct | -13.50% | Disposed | 47.3% (price as of 2026-08-20) |
| May 20, 2024 | MPWR | S | 200 | $750.00 | $150,000 | 741 Direct | -21.25% | Disposed | 74.6% (price as of 2026-08-20) |
| May 15, 2024 | MPWR | S | 100 | $740.00 | $74,000 | 941 Direct | -9.61% | Disposed | 77.0% (price as of 2026-08-20) |
| May 15, 2024 | MPWR | S | 100 | $730.00 | $73,000 | 1,041 Direct | -8.76% | Disposed | 79.4% (price as of 2026-08-20) |
| Feb. 29, 2024 | MPWR | S | 250 | $706.34 | $176,585 | 1,141 Direct | -17.97% | Disposed | 85.4% (price as of 2026-08-20) |
| Feb. 22, 2024 | MPWR | S | 250 | $750.00 | $187,500 | 1,391 Direct | -15.23% | Disposed | 74.6% (price as of 2026-08-20) |
| Nov. 14, 2023 | MPWR | S | 400 | $523.64 | $209,456 | 1,293 Direct | -23.63% | Disposed | 150.1% (price as of 2026-08-20) |
| Nov. 13, 2023 | MPWR | S | 100 | $510.00 | $51,000 | 1,693 Direct | -5.58% | Disposed | 156.8% (price as of 2026-08-20) |
| Aug. 29, 2023 | MPWR | S | 500 | $500.00 | $250,000 | 1,793 Direct | -21.81% | Disposed | 161.9% (price as of 2026-08-20) |
| Feb. 26, 2021 | MPWR | S | 300 | $370.00 | $111,000 | 1,281 Direct | -18.98% | Disposed | 253.9% (price as of 2026-08-20) |
| Aug. 28, 2020 | MPWR | S | 1,300 | $268.00 | $348,400 | 4,048 Direct | -24.31% | Disposed | 388.6% (price as of 2026-08-20) |
| Aug. 12, 2020 | MPWR | S | 200 | $279.00 | $55,800 | 5,548 Direct | -3.48% | Disposed | 369.3% (price as of 2026-08-20) |
| Aug. 12, 2020 | MPWR | S | 200 | $280.00 | $56,000 | 5,348 Direct | -3.60% | Disposed | 367.7% (price as of 2026-08-20) |
| Aug. 7, 2020 | MPWR | S | 100 | $283.00 | $28,300 | 5,748 Direct | -1.71% | Disposed | 362.7% (price as of 2026-08-20) |
| Aug. 6, 2020 | MPWR | S | 600 | $280.00 | $168,000 | 5,848 Direct | -9.31% | Disposed | 367.7% (price as of 2026-08-20) |
| Aug. 5, 2020 | MPWR | S | 200 | $275.00 | $55,000 | 6,848 Direct | -2.84% | Disposed | 376.2% (price as of 2026-08-20) |
| Aug. 5, 2020 | MPWR | S | 200 | $276.00 | $55,200 | 6,648 Direct | -2.92% | Disposed | 374.5% (price as of 2026-08-20) |
| Aug. 5, 2020 | MPWR | S | 200 | $277.00 | $55,400 | 6,448 Direct | -3.01% | Disposed | 372.7% (price as of 2026-08-20) |
| Aug. 4, 2020 | MPWR | S | 100 | $274.00 | $27,400 | 7,148 Direct | -1.38% | Disposed | 377.9% (price as of 2026-08-20) |
| Aug. 4, 2020 | MPWR | S | 100 | $275.00 | $27,500 | 7,048 Direct | -1.40% | Disposed | 376.2% (price as of 2026-08-20) |
| Aug. 3, 2020 | MPWR | S | 476 | $271.26 | $129,120 | 7,248 Direct | -6.16% | Disposed | 382.7% (price as of 2026-08-20) |
| May 11, 2020 | MPWR | S | 2,000 | $212.00 | $424,000 | 7,724 Direct | -20.57% | Disposed | 517.7% (price as of 2026-08-20) |
| May 8, 2020 | MPWR | S | 1,026 | $208.00 | $213,408 | 9,724 Direct | -9.54% | Disposed | 529.6% (price as of 2026-08-20) |
| May 5, 2020 | MPWR | S | 1,000 | $198.00 | $198,000 | 10,750 Direct | -8.51% | Disposed | 561.4% (price as of 2026-08-20) |
| Feb. 13, 2020 | MPWR | S | 1,000 | $192.00 | $192,000 | 11,750 Direct | -7.84% | Disposed | 582.0% (price as of 2026-08-20) |
| Feb. 11, 2020 | MPWR | S | 1,000 | $187.72 | $187,720 | 11,702 Direct | -7.87% | Disposed | 597.6% (price as of 2026-08-20) |
| Feb. 26, 2014 | MPWR | S | 7,254 | $36.06 | $261,579 | 2,358 Direct | -75.47% | Disposed | 3531.4% (price as of 2026-08-20) |
| Feb. 24, 2014 | MPWR | S | 5,000 | $35.58 | $177,900 | 9,612 Direct | -34.22% | Disposed | 3580.4% (price as of 2026-08-20) |
| Nov. 29, 2013 | MPWR | S | 2,643 | $33.75 | $89,201 | 11,119 Direct | -19.21% | Disposed | 3780.0% (price as of 2026-08-20) |
| Nov. 27, 2013 | MPWR | S | 8,000 | $33.33 | $266,640 | 13,762 Direct | -36.76% | Disposed | 3828.8% (price as of 2026-08-20) |
| Nov. 13, 2013 | MPWR | S | 10,000 | $33.13 | $331,300 | 21,762 Direct | -31.48% | Disposed | 3852.6% (price as of 2026-08-20) |
| Nov. 11, 2013 | MPWR | S | 10,000 | $32.13 | $321,300 | 31,762 Direct | -23.95% | Disposed | 3975.6% (price as of 2026-08-20) |
| Nov. 7, 2013 | MPWR | S | 1,743 | $32.00 | $55,776 | 41,762 Direct | -4.01% | Disposed | 3992.1% (price as of 2026-08-20) |
| Nov. 6, 2013 | MPWR | S | 2,257 | $32.00 | $72,224 | 43,505 Direct | -4.93% | Disposed | 3992.1% (price as of 2026-08-20) |
| Aug. 28, 2013 | MPWR | S | 6,000 | $29.05 | $174,300 | 45,762 Direct | -11.59% | Disposed | 4407.7% (price as of 2026-08-20) |
| Aug. 26, 2013 | MPWR | S | 4,000 | $29.02 | $116,080 | 51,762 Direct | -7.17% | Disposed | 4412.4% (price as of 2026-08-20) |
| Aug. 15, 2013 | MPWR | S | 8,000 | $29.30 | $234,400 | 55,762 Direct | -12.55% | Disposed | 4369.2% (price as of 2026-08-20) |
| Aug. 13, 2013 | MPWR | S | 2,892 | $29.28 | $84,678 | 64,897 Direct | -4.27% | Disposed | 4372.3% (price as of 2026-08-20) |
| Aug. 13, 2013 | MPWR | S | 7,108 | $29.28 | $208,122 | 63,762 Direct | -10.03% | Disposed | 4372.3% (price as of 2026-08-20) |
| Aug. 12, 2013 | MPWR | S | 392 | $29.00 | $11,368 | 63,762 Direct | -0.61% | Disposed | 4415.5% (price as of 2026-08-20) |
| May 31, 2013 | MPWR | S | 12,500 | $24.75 | $309,375 | 63,762 Direct | -16.39% | Disposed | 5190.8% (price as of 2026-08-20) |
| May 30, 2013 | MPWR | S | 10,000 | $24.58 | $245,800 | 76,262 Direct | -11.59% | Disposed | 5227.4% (price as of 2026-08-20) |
| May 28, 2013 | MPWR | S | 5,000 | $24.56 | $122,800 | 86,262 Direct | -5.48% | Disposed | 5231.8% (price as of 2026-08-20) |
| Feb. 28, 2013 | MPWR | S | 2,799 | $24.80 | $69,415 | 91,262 Direct | -2.98% | Disposed | 5180.2% (price as of 2026-08-20) |
| Feb. 27, 2013 | MPWR | S | 2,000 | $24.90 | $49,800 | 91,262 Direct | -2.14% | Disposed | 5159.0% (price as of 2026-08-20) |
| Feb. 27, 2013 | MPWR | S | 500 | $24.90 | $12,450 | 91,262 Direct | -0.54% | Disposed | 5159.0% (price as of 2026-08-20) |
| Feb. 27, 2013 | MPWR | S | 5,000 | $24.80 | $124,000 | 91,262 Direct | -5.19% | Disposed | 5180.2% (price as of 2026-08-20) |
| Aug. 29, 2012 | MPWR | S | 2,000 | $22.01 | $44,020 | 91,035 Direct | -2.15% | Disposed | 5849.5% (price as of 2026-08-20) |
| Aug. 27, 2012 | MPWR | S | 9,500 | $22.81 | $216,695 | 91,035 Direct | -9.45% | Disposed | 5640.8% (price as of 2026-08-20) |
| Aug. 24, 2012 | MPWR | S | 8,500 | $22.36 | $190,060 | 91,035 Direct | -8.54% | Disposed | 5756.4% (price as of 2026-08-20) |
| Aug. 23, 2012 | MPWR | S | 3,000 | $22.27 | $66,810 | 91,035 Direct | -3.19% | Disposed | 5780.0% (price as of 2026-08-20) |
Showing latest 100 of 210 transactions
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| Aug. 13, 2013 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (7,108) | $22.01 | May 22, 2015 | 7,108 | Disposed |
| Aug. 12, 2013 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (94) | $19.29 | Feb. 9, 2017 | 94 | Disposed |
| Aug. 12, 2013 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (298) | — | May 22, 2015 | 298 | Disposed |
| Feb. 28, 2013 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (94) | $19.29 | Feb. 9, 2017 | 94 | Acquired |
| Feb. 28, 2013 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (2,799) | $22.01 | May 22, 2015 | 2,799 | Disposed |
| Feb. 28, 2013 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (705) | $22.01 | May 22, 2015 | 705 | Acquired |
| Feb. 27, 2013 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (2,000) | $19.29 | Feb. 9, 2017 | 2,000 | Disposed |
| Feb. 27, 2013 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (500) | $22.01 | May 22, 2015 | 500 | Disposed |
| Feb. 27, 2013 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (5,000) | $22.01 | May 22, 2015 | 5,000 | Disposed |
| Aug. 29, 2012 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (2,000) | $20.20 | Feb. 9, 2017 | 2,000 | Disposed |
| Aug. 27, 2012 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (9,500) | $20.20 | Feb. 9, 2017 | 9,500 | Disposed |
| Aug. 24, 2012 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (8,500) | $20.20 | Feb. 9, 2017 | 8,500 | Disposed |
| Aug. 23, 2012 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (3,000) | $20.20 | Feb. 9, 2017 | 3,000 | Disposed |
| Aug. 22, 2012 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (4,000) | $7.51 | June 2, 2015 | 4,000 | Disposed |
| Aug. 21, 2012 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (11,000) | $7.51 | June 2, 2015 | 11,000 | Disposed |
| Aug. 16, 2012 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (15,000) | $12.16 | June 21, 2016 | 15,000 | Disposed |
| Aug. 16, 2012 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (3,000) | $12.86 | Feb. 18, 2016 | 3,000 | Disposed |
| Aug. 14, 2012 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (2,000) | $12.86 | Feb. 18, 2016 | 2,000 | Disposed |
| Aug. 10, 2012 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (8,000) | $12.86 | Feb. 18, 2016 | 8,000 | Disposed |
| Aug. 9, 2012 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (12,000) | $12.86 | Feb. 18, 2016 | 12,000 | Disposed |
| Feb. 29, 2012 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (15,000) | $16.97 | May 24, 2014 | 15,000 | Disposed |
| March 2, 2010 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (80,000) | $0.08 | March 7, 2010 | 80,000 | Disposed |
| Feb. 9, 2010 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (25,000) | $20.20 | Feb. 9, 2017 | 25,000 | Acquired |
| Feb. 18, 2009 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (25,000) | $12.86 | Feb. 18, 2016 | 25,000 | Acquired |
| May 22, 2008 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (15,000) | $23.05 | May 22, 2015 | 15,000 | Acquired |
| May 24, 2007 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (15,000) | $16.97 | May 24, 2014 | 15,000 | Acquired |
| June 21, 2006 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (15,000) | $12.16 | June 21, 2016 | 15,000 | Acquired |
| June 2, 2005 | MPWR | Non-Qualified Stock Option (right to buy) | Common Stock (15,000) | $7.51 | June 2, 2015 | 15,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).