Jim Simons
ARWR icon

Jim Simons’s Arrowhead Research ARWR Stock Holding History

Jim Simons’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 		$38.2M Sell
468,921
-567,574
-55% -$41.9M 0.05% 428
2026
Q1 		$65M Buy
+1,036,495
New +$65.6M 0.1% 250
2024
Q4 		– Sell
-231,300
Closed -$4.48M – 3558
2024
Q3 		$4.48M Buy
+231,300
New +$5.65M 0.01% 1516
2024
Q1 		– Sell
-122,000
Closed -$3.73M – 3690
2023
Q4 		$3.73M Sell
122,000
-259,500
-68% -$6.89M 0.01% 1540
2023
Q3 		$10.3M Sell
381,500
-3,400
-0.9% -$104K 0.02% 906
2023
Q2 		$13.7M Buy
384,900
+92,100
+31% +$3.18M 0.02% 864
2023
Q1 		$7.44M Sell
292,800
-201,000
-41% -$6.32M 0.01% 1253
2022
Q4 		$20M Sell
493,800
-261,600
-35% -$8.67M 0.03% 709
2022
Q3 		$25M Buy
755,400
+314,400
+71% +$12.7M 0.04% 571
2022
Q2 		$15.5M Buy
441,000
+60,700
+16% +$2.28M 0.02% 863
2022
Q1 		$17.5M Buy
+380,300
New +$18.8M 0.02% 820
2021
Q4 		– Sell
-54,100
Closed -$3.38M – 3883
2021
Q3 		$3.38M Sell
54,100
-125,100
-70% -$8.1M ﹤0.01% 1701
2021
Q2 		$14.8M Sell
179,200
-62,400
-26% -$4.65M 0.02% 927
2021
Q1 		$16M Buy
+241,600
New +$18.7M 0.02% 910
2020
Q2 		– Sell
-666,400
Closed -$19.2M – 3422
2020
Q1 		$19.2M Sell
666,400
-55,900
-8% -$2.25M 0.02% 795
2019
Q4 		$45.8M Buy
722,300
+64,700
+10% +$3.21M 0.04% 563
2019
Q3 		$18.5M Sell
657,600
-131,200
-17% -$3.88M 0.02% 1001
2019
Q2 		$20.9M Buy
788,800
+618,400
+363% +$13.6M 0.02% 936
2019
Q1 		$3.13M Buy
+170,400
New +$2.81M ﹤0.01% 2089
2017
Q3 		– Sell
-374,164
Closed -$606K – 3190
2017
Q2 		$606K Buy
+374,164
New +$606K ﹤0.01% 2716
2014
Q1 		– Sell
-54,400
Closed -$590K – 2806
2013
Q4 		$590K Buy
+54,400
New +$435K ﹤0.01% 2303

Other funds holding ARWR

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Avoro Capital Advisors
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 $3.38T AUM 44.17% 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
Fred Alger Management
Fred Alger Management New York $30B AUM 76.99% 1-Year Est. Return

Jim Simons's ARWR Position: Q2 2026 in Review

Jim Simons reduced its Arrowhead Research (ARWR) stake by 55% in Q2 2026, selling an estimated $41.9M and leaving 468,921 shares worth $38.2M. The position accounts for 0.05% of the portfolio, ranked #428.

Jim Simons first reported a position in ARWR in Q4 2013 and has held it in 21 quarters since. The position peaked at $65M in Q1 2026. 502 funds tracked by Wall St. Rank hold ARWR as of Q2 2026.

  • Jim Simons held 468,921 shares of Arrowhead Research worth $38.2M as of Q2 2026.
  • Jim Simons sold 567,574 Arrowhead Research shares in Q2 2026, an estimated $41.9M.
  • Arrowhead Research made up 0.05% of Jim Simons's portfolio in Q2 2026, its #428 holding.
  • Jim Simons first reported a position in Arrowhead Research in Q4 2013 and has held it in 21 quarters since.
  • Jim Simons's Arrowhead Research position peaked at $65M in Q1 2026.
  • 502 funds tracked by Wall St. Rank held Arrowhead Research as of Q2 2026.

Based on Renaissance Technologies's 13F filing for Q2 2026, filed 13 Aug 2026.