Essex Investment Management’s Monolithic Power Systems MPWR Stock Holding History

Essex Investment Management’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	$131K	Hold	120	–	–	0.02%	225
2025 Q4	$109K	Hold	120	–	–	0.02%	230
2025 Q3	$110K	Sell	120 -180	-60%	-$146K	0.02%	223
2025 Q2	$219K	Hold	300	–	–	0.04%	191
2025 Q1	$174K	Hold	300	–	–	0.04%	187
2024 Q4	$178K	Hold	300	–	–	0.03%	199
2024 Q3	$277K	Hold	300	–	–	0.05%	175
2024 Q2	$247K	Hold	300	–	–	0.05%	183
2024 Q1	$203K	Hold	300	–	–	0.04%	199
2023 Q4	$189K	Hold	300	–	–	0.04%	213
2023 Q3	$139K	Sell	300 -1,295	-81%	-$662K	0.02%	280
2023 Q2	$862K	Hold	1,595	–	–	0.12%	223
2023 Q1	$798K	Hold	1,595	–	–	0.12%	226
2022 Q4	$564K	Hold	1,595	–	–	0.09%	241
2022 Q3	$580K	Hold	1,595	–	–	0.09%	233
2022 Q2	$613K	Buy	+1,595	New	+$674K	0.1%	237

Other funds holding MPWR

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

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 Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return

Franklin Resources San Mateo, California $408B AUM 30.18% 1-Year Est. Return

T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return

Essex Investment Management's MPWR Position: Q1 2026 in Review

Essex Investment Management held its Monolithic Power Systems (MPWR) position steady in Q1 2026 at 120 shares worth $131K. The position accounts for 0.02% of the portfolio, ranked #225.

Essex Investment Management first reported a position in MPWR in Q2 2022 and has held it in 16 quarters since. The position peaked at $862K in Q2 2023. 1,115 funds tracked by Wall St. Rank hold MPWR as of Q1 2026.

Essex Investment Management held 120 shares of Monolithic Power Systems worth $131K as of Q1 2026.
Essex Investment Management left its Monolithic Power Systems share count unchanged in Q1 2026.
Monolithic Power Systems made up 0.02% of Essex Investment Management's portfolio in Q1 2026, its #225 holding.
Essex Investment Management first reported a position in Monolithic Power Systems in Q2 2022 and has held it in 16 quarters since.
Essex Investment Management's Monolithic Power Systems position peaked at $862K in Q2 2023.
1,115 funds tracked by Wall St. Rank held Monolithic Power Systems as of Q1 2026.

Based on Essex Investment Management's 13F filing for Q1 2026, filed 11 May 2026.