Jane Street
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Jane Street’s Monolithic Power Systems MPWR Stock Holding History

Jane Street’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
Q2 		$168M Buy
121,300
+73,700
+155% +$111M 0.01% 667
2026
Q1 		$52M Buy
47,600
+4,400
+10% +$4.81M 0.01% 1027
2025
Q4 		$39.2M Buy
43,200
+13,500
+45% +$13M 0.01% 1083
2025
Q3 		$27.3M Sell
29,700
-200
-0.7% -$162K ﹤0.01% 1380
2025
Q2 		$21.9M Buy
29,900
+6,700
+29% +$4.27M ﹤0.01% 1369
2025
Q1 		$13.5M Sell
23,200
-53,700
-70% -$33.8M ﹤0.01% 1654
2024
Q4 		$45.5M Buy
76,900
+37,700
+96% +$27.3M 0.01% 740
2024
Q3 		$36.2M Sell
39,200
-11,200
-22% -$9.67M 0.01% 849
2024
Q2 		$41.4M Sell
50,400
-17,000
-25% -$12.3M 0.01% 796
2024
Q1 		$45.7M Buy
67,400
+9,200
+16% +$6.14M 0.01% 677
2023
Q4 		$36.7M Buy
58,200
+14,000
+32% +$7.31M 0.01% 845
2023
Q3 		$20.4M Buy
44,200
+40,100
+978% +$20.5M 0.01% 1082
2023
Q2 		$2.21M Sell
4,100
-300
-7% -$143K ﹤0.01% 4018
2023
Q1 		$2.2M Sell
4,400
-5,100
-54% -$2.34M ﹤0.01% 3652
2022
Q4 		$3.36M Sell
9,500
-15,900
-63% -$5.71M ﹤0.01% 3050
2022
Q3 		$9.23M Buy
25,400
+4,600
+22% +$2.05M ﹤0.01% 1779
2022
Q2 		$7.99M Sell
20,800
-15,300
-42% -$6.46M ﹤0.01% 2009
2022
Q1 		$17.5M Buy
36,100
+30,300
+522% +$13.2M 0.01% 1382
2021
Q4 		$2.86M Sell
5,800
-11,100
-66% -$5.73M ﹤0.01% 3770
2021
Q3 		$8.19M Buy
16,900
+5,900
+54% +$2.68M ﹤0.01% 2059
2021
Q2 		$4.11M Sell
11,000
-16,000
-59% -$5.63M ﹤0.01% 2994
2021
Q1 		$9.54M Buy
27,000
+22,400
+487% +$8.16M ﹤0.01% 1589
2020
Q4 		$1.69M Sell
4,600
-10,200
-69% -$3.27M ﹤0.01% 3797
2020
Q3 		$4.14M Buy
+14,800
New +$3.85M ﹤0.01% 2065

Other funds holding MPWR

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return
Franklin Resources
Franklin Resources San Mateo, California $462B AUM 39.16% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return

Jane Street's MPWR Position: Q2 2026 in Review

Jane Street increased its Monolithic Power Systems (MPWR) stake by 3,427% in Q2 2026, buying an estimated $262M and bringing the position to 179,293 shares worth $248M. The position accounts for 0.02% of the portfolio, ranked #497.

Jane Street first reported a position in MPWR in Q3 2013 and has held it in 37 quarters since. 1,245 funds tracked by Wall St. Rank hold MPWR as of Q2 2026.

  • Jane Street held 179,293 shares of Monolithic Power Systems worth $248M as of Q2 2026.
  • Jane Street bought 174,210 Monolithic Power Systems shares in Q2 2026, an estimated $262M.
  • Monolithic Power Systems made up 0.02% of Jane Street's portfolio in Q2 2026, its #497 holding.
  • Jane Street first reported a position in Monolithic Power Systems in Q3 2013 and has held it in 37 quarters since.
  • 1,245 funds tracked by Wall St. Rank held Monolithic Power Systems as of Q2 2026.

Based on Jane Street's 13F filing for Q2 2026, filed 14 Aug 2026.