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Roman Butler Fullerton & Co’s Monolithic Power Systems MPWR Stock Holding History

Roman Butler Fullerton & Co’s Portfolio MPWR Stock Details MPWR Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$203K Buy
+155
New +$169K 0.06% 267
2025
Q1 		– Sell
-455
Closed -$273K – 240
2024
Q4 		$273K Buy
+455
New +$329K 0.09% 192
2019
Q4 		– Sell
-2,860
Closed -$445K – 170
2019
Q3 		$445K Buy
+2,860
New +$428K 0.31% 102

Other funds holding MPWR

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return
Franklin Resources
Franklin Resources San Mateo, California $408B AUM 30.18% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return

Roman Butler Fullerton & Co's MPWR Position: Q1 2026 in Review

Roman Butler Fullerton & Co opened a new position in Monolithic Power Systems (MPWR) in Q1 2026: 155 shares worth $203K. The stake represents 0.06% of the portfolio and ranks #267 among its holdings. This is a return to the name: Roman Butler Fullerton & Co previously reported a position in MPWR as recently as Q4 2024.

Roman Butler Fullerton & Co first reported a position in MPWR in Q3 2019 and has held it in 3 quarters since. The position peaked at $445K in Q3 2019. 1,114 funds tracked by Wall St. Rank hold MPWR as of Q1 2026.

  • Roman Butler Fullerton & Co held 155 shares of Monolithic Power Systems worth $203K as of Q1 2026.
  • Monolithic Power Systems was a new Roman Butler Fullerton & Co position in Q1 2026.
  • Monolithic Power Systems made up 0.06% of Roman Butler Fullerton & Co's portfolio in Q1 2026, its #267 holding.
  • Roman Butler Fullerton & Co first reported a position in Monolithic Power Systems in Q3 2019 and has held it in 3 quarters since.
  • Roman Butler Fullerton & Co's Monolithic Power Systems position peaked at $445K in Q3 2019.
  • 1,114 funds tracked by Wall St. Rank held Monolithic Power Systems as of Q1 2026.

Based on Roman Butler Fullerton & Co's 13F filing for Q1 2026, filed 30 Apr 2026.