Janus Henderson Group
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Janus Henderson Group’s Monolithic Power Systems MPWR Stock Holding History

Janus Henderson Group’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 		$8.06M Buy
7,374
+128
+2% +$140K ﹤0.01% 829
2025
Q4 		$6.57M Sell
7,246
-120,492
-94% -$116M ﹤0.01% 843
2025
Q3 		$118M Buy
127,738
+309
+0.2% +$251K 0.05% 254
2025
Q2 		$93.2M Buy
127,429
+21,816
+21% +$13.9M 0.05% 275
2025
Q1 		$61.3M Buy
105,613
+99,668
+1,677% +$62.8M 0.03% 336
2024
Q4 		$3.52M Sell
5,945
-51
-0.9% -$36.9K ﹤0.01% 1045
2024
Q3 		$5.55M Buy
5,996
+2,134
+55% +$1.84M ﹤0.01% 852
2024
Q2 		$3.17M Sell
3,862
-1,137
-23% -$821K ﹤0.01% 1041
2024
Q1 		$3.38M Buy
4,999
+2
+0% +$1.33K ﹤0.01% 1038
2023
Q4 		$3.15M Sell
4,997
-36
-0.7% -$18.8K ﹤0.01% 1021
2023
Q3 		$2.33M Sell
5,033
-186
-4% -$95.1K ﹤0.01% 1104
2023
Q2 		$2.82M Sell
5,219
-558
-10% -$265K ﹤0.01% 1071
2023
Q1 		$2.89M Buy
5,777
+1,167
+25% +$536K ﹤0.01% 1081
2022
Q4 		$1.63M Buy
4,610
+1
+0% +$359 ﹤0.01% 1156
2022
Q3 		$1.68M Buy
4,609
+4
+0.1% +$1.78K ﹤0.01% 1385
2022
Q2 		$1.77M Sell
4,605
-641
-12% -$271K ﹤0.01% 1088
2022
Q1 		$2.55M Buy
5,246
+1,245
+31% +$543K ﹤0.01% 1164
2021
Q4 		$1.98M Buy
4,001
+182
+5% +$93.9K ﹤0.01% 1271
2021
Q3 		$1.85M Sell
3,819
-159
-4% -$72.3K ﹤0.01% 1267
2021
Q2 		$1.49M Buy
3,978
+44
+1% +$15.5K ﹤0.01% 1279
2021
Q1 		$1.39M Sell
3,934
-3,406
-46% -$1.24M ﹤0.01% 1233
2020
Q4 		$2.69M Sell
7,340
-5,722
-44% -$1.83M ﹤0.01% 1081
2020
Q3 		$3.65M Sell
13,062
-2,393
-15% -$623K ﹤0.01% 960
2020
Q2 		$3.66M Buy
15,455
+7,855
+103% +$1.59M ﹤0.01% 957
2020
Q1 		$1.27M Sell
7,600
-252,094
-97% -$43.2M ﹤0.01% 1070
2019
Q4 		$46.2M Sell
259,694
-2,628
-1% -$420K 0.02% 619
2019
Q3 		$40.8M Buy
262,322
+1,002
+0.4% +$150K 0.02% 642
2019
Q2 		$35.5M Sell
261,320
-1,625
-0.6% -$221K 0.02% 669
2019
Q1 		$35.6M Buy
262,945
+3,055
+1% +$401K 0.02% 651
2018
Q4 		$30.2M Sell
259,890
-7,218
-3% -$864K 0.02% 652
2018
Q3 		$33.5M Sell
267,108
-1,584
-0.6% -$221K 0.02% 687
2018
Q2 		$35.9M Buy
268,692
+15,237
+6% +$1.94M 0.02% 647
2018
Q1 		$29.3M Buy
253,455
+27,541
+12% +$3.26M 0.02% 696
2017
Q4 		$25.4M Buy
225,914
+111,725
+98% +$13M 0.02% 695
2017
Q3 		$12.2M Sell
114,189
-33,554
-23% -$3.41M 0.01% 825
2017
Q2 		$14.2M Buy
147,743
+68,089
+85% +$6.49M 0.01% 806
2017
Q1 		$7.34M Sell
79,654
-2,338
-3% -$207K 0.05% 315
2016
Q4 		$6.72M Buy
+81,992
New +$6.58M 0.05% 325

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

Janus Henderson Group's MPWR Position: Q1 2026 in Review

Janus Henderson Group increased its Monolithic Power Systems (MPWR) stake by 1.8% in Q1 2026, buying an estimated $140K and bringing the position to 7,374 shares worth $8.06M. The position accounts for ﹤0.01% of the portfolio, ranked #829.

Janus Henderson Group first reported a position in MPWR in Q4 2016 and has held it in 38 quarters since. The position peaked at $118M in Q3 2025. 1,114 funds tracked by Wall St. Rank hold MPWR as of Q1 2026.

  • Janus Henderson Group held 7,374 shares of Monolithic Power Systems worth $8.06M as of Q1 2026.
  • Janus Henderson Group bought 128 Monolithic Power Systems shares in Q1 2026, an estimated $140K.
  • Monolithic Power Systems made up ﹤0.01% of Janus Henderson Group's portfolio in Q1 2026, its #829 holding.
  • Janus Henderson Group first reported a position in Monolithic Power Systems in Q4 2016 and has held it in 38 quarters since.
  • Janus Henderson Group's Monolithic Power Systems position peaked at $118M in Q3 2025.
  • 1,114 funds tracked by Wall St. Rank held Monolithic Power Systems as of Q1 2026.

Based on Janus Henderson Group's 13F filing for Q1 2026, filed 15 May 2026.