Filing Flows › Monolithic Power Systems (MPWR) › Who owns the stock
Who owns Monolithic Power Systems (MPWR) stock
1,189 funds reported Monolithic Power Systems (MPWR) shares in their latest 13F filings, worth $68.2B in all. The largest holder is BlackRock ($7.7B). Last quarter 576 funds added to their stakes and 492 cut them. Members of Congress and other officials disclosed 5 trades (3 buys, 2 sales).
Largest holders (13F)
| Fund | Shares | Value | Change | Quarter |
|---|---|---|---|---|
| BlackRock | 5,589,925 | $7.7B | decrease | 2026-06-30 |
| FMR LLC | 5,177,258 | $7.2B | increase | 2026-06-30 |
| Vanguard Group | 6,034,394 | $5.5B | decrease | 2025-12-31 |
| Vanguard Capital Management LLC | 3,126,756 | $4.3B | increase | 2026-06-30 |
| Vanguard Portfolio Management LLC | 2,504,858 | $3.5B | decrease | 2026-06-30 |
| Invesco | 2,343,930 | $3.2B | decrease | 2026-06-30 |
| State Street | 2,282,186 | $3.2B | increase | 2026-06-30 |
| Geode Capital Management, LLC | 1,195,281 | $1.6B | decrease | 2026-06-30 |
| Price T Rowe Associates | 976,798 | $1.4B | decrease | 2026-06-30 |
| Franklin Resources | 811,974 | $1.1B | decrease | 2026-06-30 |
| Goldman Sachs Group | 780,650 | $1.1B | increase | 2026-06-30 |
| Van ECK Associates | 746,237 | $1.0B | increase | 2026-06-30 |
| Morgan Stanley | 727,885 | $1.0B | increase | 2026-06-30 |
| Bank of America | 536,236 | $741M | increase | 2026-06-30 |
| Royal Bank of Canada | 487,212 | $674M | increase | 2026-06-30 |
Trades by Congress and other officials
| Date | Who | Trade | Amount |
|---|---|---|---|
| 2026-06-05 | Byron Donalds | partial sale | $1K–$15K |
| 2026-06-05 | Byron Donalds | partial sale | $1K–$15K |
| 2026-02-04 | Markwayne Mullin | purchase | $15K–$50K |
| 2026-01-05 | Markwayne Mullin | purchase | $15K–$50K |
| 2026-01-05 | Markwayne Mullin | purchase | $15K–$50K |
Monolithic Power Systems' latest quarter
Monolithic Power Systems, Q3 2026: revenue $1.2B (+63% year over year), operating margin 29.7%, net earnings $271M, operating cash flow $290M. The chart follows the revenue to costs, profit and cash.
Questions
Who owns the most MPWR stock?
By the latest 13F filings: BlackRock ($7.7B); FMR LLC ($7.2B); Vanguard Group ($5.5B); Vanguard Capital Management LLC ($4.3B); Vanguard Portfolio Management LLC ($3.5B).
Has Congress traded MPWR stock?
Officials disclosed 5 trades on file: 3 buys and 2 sales. The latest: Byron Donalds, partial sale on 2026-06-05.
What is the short interest in MPWR?
1,602,872 shares were sold short at the 2026-10-15 settlement, -13.77% of the float.
Updated Nov 8, 2026. Read automatically from SEC filings and public data; errors are possible. Not investment advice.