Monolithic Power Systems
Designs integrated power semiconductors for data centers, vehicles, computing, communications, consumer, and industrial systems.
$1,258.47
After-hours close+2.22 (+0.18%)
At close$1,256.25(−4.18%)
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Breakdown13F · Form 4
Institutions 292.92%Insiders 3.04%
A 13F quarter can total more than the shares outstanding — sub-advisers file the same block twice, and a filer's own share count can be a quarter stale. No split is drawn from it.
Shares outstanding 49.13M · Float 47.36M · 96.4% free float
Institutions13F, as of Jun 30, 2026
1,284 holders · 143.91M shares · 218 new positions · 636 increased · 466 reduced · 102 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 5.59M | 11.38% | −482.5K | Aug 7, 2026 |
| FMR LLC | 5.18M | 10.54% | +776.4K | Aug 13, 2026 |
| Vanguard Capital Management LLC | 3.13M | 6.36% | +43.3K | Aug 13, 2026 |
| Vanguard Portfolio Management LLC | 2.50M | 5.10% | −11.6K | Aug 13, 2026 |
| Invesco Ltd. | 2.34M | 4.77% | +1.31M | Aug 14, 2026 |
| State Street Corp | 2.28M | 4.65% | +93.7K | Aug 7, 2026 |
| Geode Capital Management, LLC | 1.20M | 2.43% | −236.8K | Aug 12, 2026 |
| Price T Rowe Associates Inc /MD/ | 976.8K | 1.99% | −286.2K | Aug 14, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 10.20% | 4.90M | 13G | Jan 8, 2026 ↗ |
| FMR LLC | 8.30% | 3.98M | 13G | Feb 5, 2026 ↗ |
| Vanguard Capital Management | 7.25% | 3.56M | 13G | Apr 30, 2026 ↗ |
| Invesco Ltd. | 5.20% | 2.51M | 13G | Jul 15, 2026 ↗ |
| Vanguard Portfolio Management | 5.14% | 2.53M | 13G | Apr 29, 2026 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Michael Hsing | director, officer: CEO | 848.3K | 1.73% | May 20, 2026 |
| Deming Xiao | officer: EVP, Global Operations | 210.3K | 0.43% | May 8, 2026 |
| Maurice Sciammas | officer: EVP, WW Sales & Marketing | 162.7K | 0.33% | Aug 6, 2026 |
| Saria Tseng | officer: EVP & General Counsel | 145.2K | 0.30% | May 29, 2026 |
| Theodore Blegen | officer: EVP and CFO | 82.4K | 0.17% | Feb 10, 2026 |
| Victor K. Lee | director | 27.8K | 0.06% | Feb 11, 2026 |
| Robert W. Ii Dean | officer: Interim CFO | 7.2K | 0.01% | Aug 26, 2026 |
| Eugen J. Elmiger | director | 5.4K | 0.01% | May 8, 2026 |
| Jeff Zhou | director | 3.8K | 0.01% | May 27, 2026 |
| Carintia Martinez | director | 1.1K | 0.00% | Feb 5, 2026 |
1 ten-percent owner holds 2.30M shares by Form 4, outside the officers-and-directors figure above · 8 people have not refiled in the last 18 months (2.55M shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 24, 2026 | Robert W. Ii Deanofficer: Interim CFO | Sale | 32 | $1,297.72 | 7,094 |
| Aug 24, 2026 | Kuo Wei Herbert Changdirector | Sale | 50 | $1,281.57 | 515 |
| Aug 17, 2026 | Robert W. Ii Deanofficer: Interim CFO | Sale | 6 | $1,413.64 | 7,126 |
| Aug 11, 2026 | Kuo Wei Herbert Changdirector | Sale | 50 | $1,420.00 | 565 |
| Aug 5, 2026 | Robert W. Ii Deanofficer: Interim CFO | Sale | 105 | $1,344.27 | 7,132 |
| Aug 3, 2026 | Maurice Sciammasofficer: EVP, WW Sales & Marketing | Sale | 30 | $1,343.94 | 1,119 |
| Jul 15, 2026 | Maurice Sciammasofficer: EVP, WW Sales & Marketing | Sale · 18 lots | 15,000 | $1,349.73 | 151,644 |
| Jul 1, 2026 | Maurice Sciammasofficer: EVP, WW Sales & Marketing | Sale | 30 | $1,351.61 | 1,149 |
| Jun 1, 2026 | Maurice Sciammasofficer: EVP, WW Sales & Marketing | Sale | 30 | $1,533.95 | 1,179 |
| May 27, 2026 | Saria Tsengofficer: EVP & General Counsel | Sale | 7,565 | $1,700.00 | 144,218 |
CongressHouse and Senate disclosures
| Member | Type | Amount | Owner | Traded | Disclosed |
|---|---|---|---|---|---|
| Rep. Byron Donalds · FL19 | Sale | $1,001 – $15,000 | Spouse | Jun 5, 2026 | Jul 16, 2026 ↗ |
| Sen. Markwayne Mullin · OK | Purchase | $15,001 – $50,000 | Joint | Feb 4, 2026 | Mar 2, 2026 ↗ |
| Sen. Markwayne Mullin · OK | Purchase | $15,001 – $50,000 | Self | Jan 5, 2026 | Feb 4, 2026 ↗ |
| Sen. Markwayne Mullin · OK | Purchase | $15,001 – $50,000 | Self | Jan 5, 2026 | Feb 3, 2026 ↗ |