Monolithic Power Systems
MPWR
1,122 hedge funds and large institutions have $51.6B invested in Monolithic Power Systems in 2026 Q1 according to their latest regulatory filings, with 181 funds opening new positions, 384 increasing their positions, 406 reducing their positions, and 105 closing their positions.
72% more first-time investments, than exits
New positions opened: 181 | Existing positions closed: 105
44% more funds holding in top 10
Funds holding in top 10: 9 → 13 (+4)
17% more capital invested
Capital invested by funds: $44.1B → $51.6B (+$7.46B)
6% more funds holding
Funds holding: 1,061 → 1,122 (+61)
5% less repeat investments, than reductions
Existing positions increased: 384 | Existing positions reduced: 406
5.51% less ownership
Funds ownership: 101.74% → 96.23% (-5.5%)
29% less call options, than puts
Call options by funds: $299M | Put options by funds: $418M
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fidelity Investments
Boston,
Massachusetts
|
+$463M |
| 2 |
Royal Bank of Canada
Toronto,
Ontario, Canada
|
+$324M |
| 3 |
Lord, Abbett & Co
Jersey City,
New Jersey
|
+$122M |
| 4 |
BlackRock
New York
|
+$120M |
| 5 |
UBS Group
Zurich,
Switzerland
|
+$111M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
T. Rowe Price Associates
Baltimore,
Maryland
|
-$468M |
| 2 |
Bank of America
Charlotte,
North Carolina
|
-$183M |
| 3 |
Fidelity International
Hamilton,
Bermuda
|
-$176M |
| 4 |
Wellington Management Group
Boston,
Massachusetts
|
-$147M |
| 5 |
Brown Advisory
Baltimore,
Maryland
|
-$132M |
MPWR Hedge Fund Activity: Q1 2026 in Review
1,122 of the 8,208 institutional investors tracked by Wall St. Rank reported a position in Monolithic Power Systems (MPWR) for Q1 2026, worth a combined $51.6B — up 17% from $44.1B a quarter earlier.
Buyers outnumbered sellers: 181 funds opened new MPWR positions and 105 closed out — a net gain of 76 holders — while 384 added to existing stakes and 406 trimmed.
The largest buyer was Fidelity Investments, adding an estimated $463M. The largest seller was T. Rowe Price Associates, cutting an estimated $468M.
- 1,122 institutional investors held Monolithic Power Systems (MPWR) as of Q1 2026, up from 1,061 in Q4 2025.
- Funds reported $51.6B of Monolithic Power Systems stock for Q1 2026, up 17% quarter-over-quarter.
- 181 funds opened new Monolithic Power Systems positions in Q1 2026 and 105 closed out, a net change of +76 holders.
- The largest Monolithic Power Systems buyer in Q1 2026 was Fidelity Investments, an estimated $463M added.
- The largest Monolithic Power Systems seller in Q1 2026 was T. Rowe Price Associates, an estimated $468M sold.
Based on aggregated 13F filings for Q1 2026.