Monolithic Power Systems (MPWR)
Designs integrated power semiconductors for data centers, vehicles, computing, communications, consumer, and industrial systems.
$1,325.64
vs last close−54.98 (−3.98%)
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13F · 13D/G · Form 4
| Institutions | ≈ 95.15% | 46.76M shares | |
|---|---|---|---|
| 1,289 holders · as of Jun 30, 2026 · largest filers plus last quarter's tail | |||
| Insiders | 3.04% | 1.49M shares | |
| 12 holders · as of Sep 2, 2026 | |||
| Other | ≈ 1.81% | 888.8K shares | |
| remainder | |||
49.14M company shares as of Sep 23, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing
This quarter's institutional total failed a plausibility check; shown: the largest filers plus last quarter's remainder.
13F, as of Jun 30, 2026
1,289 holders · 46.76M shares · 217 new positions · 637 increased · 470 reduced · 99 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 5.59M | 11.37% | −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 | 4.64% | +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 |
13D/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 |
Form 4
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 |
House 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 |