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
Q3 		$192M Buy
142,400
+21,600
+18% +$28.3M 0.02% 557
2026
Q2 		$167M Buy
120,800
+101,600
+529% +$153M 0.01% 668
2026
Q1 		$21M Sell
19,200
-6,000
-24% -$6.56M ﹤0.01% 1748
2025
Q4 		$22.8M Buy
25,200
+2,400
+11% +$2.31M ﹤0.01% 1498
2025
Q3 		$21M Buy
22,800
+7,400
+48% +$6M ﹤0.01% 1624
2025
Q2 		$11.3M Sell
15,400
-2,900
-16% -$1.85M ﹤0.01% 1999
2025
Q1 		$10.6M Sell
18,300
-49,200
-73% -$31M ﹤0.01% 1919
2024
Q4 		$39.9M Buy
67,500
+53,300
+375% +$38.6M 0.01% 817
2024
Q3 		$13.1M Sell
14,200
-8,200
-37% -$7.08M ﹤0.01% 1640
2024
Q2 		$18.4M Sell
22,400
-21,600
-49% -$15.6M ﹤0.01% 1391
2024
Q1 		$29.8M Sell
44,000
-23,000
-34% -$15.4M 0.01% 923
2023
Q4 		$42.3M Buy
67,000
+15,700
+31% +$8.2M 0.01% 768
2023
Q3 		$23.7M Buy
51,300
+46,200
+906% +$23.6M 0.01% 975
2023
Q2 		$2.76M Sell
5,100
-5,400
-51% -$2.57M ﹤0.01% 3645
2023
Q1 		$5.26M Sell
10,500
-4,500
-30% -$2.07M ﹤0.01% 2370
2022
Q4 		$5.3M Sell
15,000
-10,400
-41% -$3.74M ﹤0.01% 2393
2022
Q3 		$9.23M Buy
25,400
+8,000
+46% +$3.56M ﹤0.01% 1778
2022
Q2 		$6.68M Sell
17,400
-54,600
-76% -$23.1M ﹤0.01% 2248
2022
Q1 		$35M Buy
72,000
+6,000
+9% +$2.61M 0.01% 877
2021
Q4 		$32.6M Sell
66,000
-14,800
-18% -$7.64M 0.01% 858
2021
Q3 		$39.2M Buy
80,800
+69,400
+609% +$31.6M 0.01% 708
2021
Q2 		$4.26M Buy
11,400
+1,000
+10% +$352K ﹤0.01% 2938
2021
Q1 		$3.67M Buy
10,400
+3,400
+49% +$1.24M ﹤0.01% 2886
2020
Q4 		$2.56M Sell
7,000
-10,600
-60% -$3.4M ﹤0.01% 3080
2020
Q3 		$4.92M Buy
17,600
+9,000
+105% +$2.34M ﹤0.01% 1867
2020
Q2 		$2.04M Buy
+8,600
New +$1.74M ﹤0.01% 3040

Other funds holding MPWR

BlackRock
BlackRock New York $6.79T AUM 37.06% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.32T AUM 44.66% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.76T AUM
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.21T AUM
Invesco
Invesco Atlanta, Georgia $1.27T AUM 50.62% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.44T AUM 36.12% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.92T AUM 36.1% 1-Year Est. Return
VanEck Associates
VanEck Associates New York $165B AUM 72.14% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.96T AUM 27.49% 1-Year Est. Return
Franklin Resources
Franklin Resources San Mateo, California $474B AUM 32.39% 1-Year Est. Return

Jane Street's MPWR Position: Q3 2026 in Review

Jane Street reduced its Monolithic Power Systems (MPWR) stake by 97% in Q3 2026, selling an estimated $228M and leaving 5,520 shares worth $7.44M. The position accounts for ﹤0.01% of the portfolio, ranked #3177.

Jane Street first reported a position in MPWR in Q3 2013 and has held it in 38 quarters since. The position peaked at $248M in Q2 2026. 1,045 funds tracked by Wall St. Rank hold MPWR as of Q3 2026.

  • Jane Street held 5,520 shares of Monolithic Power Systems worth $7.44M as of Q3 2026.
  • Jane Street sold 173,773 Monolithic Power Systems shares in Q3 2026, an estimated $228M.
  • Monolithic Power Systems made up ﹤0.01% of Jane Street's portfolio in Q3 2026, its #3177 holding.
  • Jane Street first reported a position in Monolithic Power Systems in Q3 2013 and has held it in 38 quarters since.
  • Jane Street's Monolithic Power Systems position peaked at $248M in Q2 2026.
  • 1,045 funds tracked by Wall St. Rank held Monolithic Power Systems as of Q3 2026.

Based on Jane Street's 13F filing for Q3 2026, filed 12 Nov 2026.