Rafferty Asset Management
MPWR icon

Rafferty Asset Management’s Monolithic Power Systems MPWR Stock Holding History

Rafferty Asset 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 		$347M Sell
317,473
-78,991
-20% -$86.3M 1.41% 21
2025
Q4 		$359M Buy
396,464
+17,146
+5% +$16.5M 1.24% 21
2025
Q3 		$349M Sell
379,318
-149,806
-28% -$121M 1.13% 22
2025
Q2 		$387M Buy
529,124
+140,269
+36% +$89.4M 1.28% 21
2025
Q1 		$226M Sell
388,855
-30,340
-7% -$19.1M 0.96% 22
2024
Q4 		$248M Buy
419,195
+28,126
+7% +$20.4M 0.88% 28
2024
Q3 		$362M Sell
391,069
-4,217
-1% -$3.64M 1.24% 19
2024
Q2 		$325M Sell
395,286
-30,272
-7% -$21.8M 1.21% 18
2024
Q1 		$288M Buy
425,558
+120,606
+40% +$80.5M 1.08% 24
2023
Q4 		$192M Buy
304,952
+41,387
+16% +$21.6M 0.81% 28
2023
Q3 		$122M Sell
263,565
-14,035
-5% -$7.18M 0.72% 31
2023
Q2 		$150M Buy
277,600
+64,533
+30% +$30.7M 0.85% 28
2023
Q1 		$107M Buy
213,067
+31,655
+17% +$14.6M 0.72% 31
2022
Q4 		$64.1M Buy
181,412
+20,406
+13% +$7.33M 0.54% 32
2022
Q3 		$58.5M Sell
161,006
-5,376
-3% -$2.39M 0.62% 32
2022
Q2 		$63.9M Sell
166,382
-32,775
-16% -$13.8M 0.59% 31
2022
Q1 		$96.7M Buy
199,157
+36,998
+23% +$16.1M 0.57% 33
2021
Q4 		$80M Buy
162,159
+52,691
+48% +$27.2M 0.42% 37
2021
Q3 		$53.1M Sell
109,468
-36,384
-25% -$16.5M 0.36% 45
2021
Q2 		$54.5M Buy
145,852
+18,195
+14% +$6.4M 0.34% 48
2021
Q1 		$45.1M Buy
127,657
+73,219
+134% +$26.7M 0.31% 53
2020
Q4 		$19.9M Sell
54,438
-168
-0.3% -$53.8K 0.19% 78
2020
Q3 		$15.3M Buy
54,606
+6,488
+13% +$1.69M 0.18% 78
2020
Q2 		$11.4M Buy
48,118
+33,282
+224% +$6.74M 0.16% 85
2020
Q1 		$2.48M Sell
14,836
-9,329
-39% -$1.6M 0.1% 118
2019
Q4 		$4.3M Buy
24,165
+3,359
+16% +$536K 0.07% 152
2019
Q3 		$3.24M Sell
20,806
-13,942
-40% -$2.08M 0.05% 218
2019
Q2 		$4.72M Buy
34,748
+2,086
+6% +$284K 0.08% 176
2019
Q1 		$4.42M Buy
32,662
+3,099
+10% +$407K 0.07% 159
2018
Q4 		$3.44M Sell
29,563
-831
-3% -$99.4K 0.08% 121
2018
Q3 		$3.81M Sell
30,394
-15,164
-33% -$2.11M 0.06% 154
2018
Q2 		$6.09M Sell
45,558
-305
-0.7% -$38.8K 0.09% 110
2018
Q1 		$5.31M Buy
45,863
+8,976
+24% +$1.06M 0.08% 126
2017
Q4 		$4.14M Buy
36,887
+14,818
+67% +$1.72M 0.07% 143
2017
Q3 		$2.35M Buy
22,069
+2,583
+13% +$262K 0.05% 199
2017
Q2 		$1.88M Buy
19,486
+6,794
+54% +$647K 0.05% 222
2017
Q1 		$1.17M Buy
+12,692
New +$1.12M 0.03% 291
2016
Q3 		– Sell
-5,719
Closed -$391K – 516
2016
Q2 		$391K Buy
5,719
+2,127
+59% +$139K 0.03% 433
2016
Q1 		$229K Buy
+3,592
New +$214K 0.01% 496

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

Rafferty Asset Management's MPWR Position: Q1 2026 in Review

Rafferty Asset Management reduced its Monolithic Power Systems (MPWR) stake by 20% in Q1 2026, selling an estimated $86.3M and leaving 317,473 shares worth $347M. The position accounts for 1.41% of the portfolio, ranked #21.

Rafferty Asset Management first reported a position in MPWR in Q1 2016 and has held it in 39 quarters since. The position peaked at $387M in Q2 2025. 1,114 funds tracked by Wall St. Rank hold MPWR as of Q1 2026.

  • Rafferty Asset Management held 317,473 shares of Monolithic Power Systems worth $347M as of Q1 2026.
  • Rafferty Asset Management sold 78,991 Monolithic Power Systems shares in Q1 2026, an estimated $86.3M.
  • Monolithic Power Systems made up 1.41% of Rafferty Asset Management's portfolio in Q1 2026, its #21 holding.
  • Rafferty Asset Management first reported a position in Monolithic Power Systems in Q1 2016 and has held it in 39 quarters since.
  • Rafferty Asset Management's Monolithic Power Systems position peaked at $387M in Q2 2025.
  • 1,114 funds tracked by Wall St. Rank held Monolithic Power Systems as of Q1 2026.

Based on Rafferty Asset Management's 13F filing for Q1 2026, filed 15 May 2026.