Jane Street
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Jane Street’s Arrowhead Research ARWR Stock Holding History

Jane Street’s Portfolio ARWR Stock Details ARWR Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$11.1M Sell
136,600
-18,600
-12% -$1.37M ﹤0.01% 2715
2026
Q1 		$9.73M Sell
155,200
-88,800
-36% -$5.62M ﹤0.01% 2575
2025
Q4 		$16.2M Buy
244,000
+149,300
+158% +$7.32M ﹤0.01% 1796
2025
Q3 		$3.27M Buy
94,700
+46,300
+96% +$1.02M ﹤0.01% 4080
2025
Q2 		$765K Buy
48,400
+25,900
+115% +$372K ﹤0.01% 6104
2025
Q1 		$287K Sell
22,500
-36,500
-62% -$664K ﹤0.01% 7888
2024
Q4 		$1.11M Buy
+59,000
New +$1.22M ﹤0.01% 5180
2024
Q3 		– Sell
-15,100
Closed -$392K – 9535
2024
Q2 		$392K Sell
15,100
-11,700
-44% -$288K ﹤0.01% 7405
2024
Q1 		$766K Sell
26,800
-9,500
-26% -$304K ﹤0.01% 5901
2023
Q4 		$1.11M Buy
36,300
+3,500
+11% +$92.9K ﹤0.01% 5366
2023
Q3 		$881K Buy
32,800
+2,300
+8% +$70.5K ﹤0.01% 5379
2023
Q2 		$1.09M Sell
30,500
-1,700
-5% -$58.6K ﹤0.01% 5067
2023
Q1 		$818K Sell
32,200
-14,200
-31% -$447K ﹤0.01% 5395
2022
Q4 		$1.88M Sell
46,400
-38,200
-45% -$1.27M ﹤0.01% 3959
2022
Q3 		$2.8M Buy
84,600
+41,400
+96% +$1.67M ﹤0.01% 3576
2022
Q2 		$1.52M Buy
43,200
+12,000
+38% +$451K ﹤0.01% 4678
2022
Q1 		$1.44M Sell
31,200
-82,700
-73% -$4.09M ﹤0.01% 5381
2021
Q4 		$7.55M Buy
113,900
+28,900
+34% +$1.99M ﹤0.01% 2247
2021
Q3 		$5.31M Sell
85,000
-27,600
-25% -$1.79M ﹤0.01% 2625
2021
Q2 		$9.33M Sell
112,600
-27,400
-20% -$2.04M ﹤0.01% 1804
2021
Q1 		$9.28M Sell
140,000
-63,400
-31% -$4.92M ﹤0.01% 1626
2020
Q4 		$15.6M Buy
203,400
+125,900
+162% +$8.05M 0.01% 1054
2020
Q3 		$3.34M Sell
77,500
-122,800
-61% -$5.3M ﹤0.01% 2309
2020
Q2 		$8.65M Buy
200,300
+146,800
+274% +$5.18M 0.01% 1293
2020
Q1 		$1.54M Sell
53,500
-30,100
-36% -$1.21M ﹤0.01% 2294
2019
Q4 		$5.3M Buy
+83,600
New +$4.15M 0.01% 1039
2018
Q3 		– Sell
-16,500
Closed -$224K – 5050
2018
Q2 		$224K Buy
+16,500
New +$154K ﹤0.01% 4443

Other funds holding ARWR

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
ACA
Avoro Capital Advisors New York $11.1B AUM 207.82% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Norges Bank
Norges Bank Oslo, Norway $1T AUM
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
FAM
Fred Alger Management New York $30B AUM 76.99% 1-Year Est. Return

Jane Street's ARWR Position: Q2 2026 in Review

Jane Street increased its Arrowhead Research (ARWR) stake by 1,144% in Q2 2026, buying an estimated $13.3M and bringing the position to 196,205 shares worth $16M. The position accounts for ﹤0.01% of the portfolio, ranked #2362.

Jane Street first reported a position in ARWR in Q2 2013 and has held it in 40 quarters since. The position peaked at $18.1M in Q2 2024. 502 funds tracked by Wall St. Rank hold ARWR as of Q2 2026.

  • Jane Street held 196,205 shares of Arrowhead Research worth $16M as of Q2 2026.
  • Jane Street bought 180,430 Arrowhead Research shares in Q2 2026, an estimated $13.3M.
  • Arrowhead Research made up ﹤0.01% of Jane Street's portfolio in Q2 2026, its #2362 holding.
  • Jane Street first reported a position in Arrowhead Research in Q2 2013 and has held it in 40 quarters since.
  • Jane Street's Arrowhead Research position peaked at $18.1M in Q2 2024.
  • 502 funds tracked by Wall St. Rank held Arrowhead Research as of Q2 2026.

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