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RTW Investments’s Arrowhead Research ARWR Stock Holding History

RTW Investments’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 		– Sell
-585,682
Closed -$36.7M – 87
2026
Q1 		$36.7M Buy
585,682
+966
+0.2% +$61.1K 0.37% 48
2025
Q4 		$38.8M Buy
+584,716
New +$28.7M 0.39% 53
2022
Q1 		– Sell
-346,842
Closed -$23M – 108
2021
Q4 		$23M Buy
+346,842
New +$23.8M 0.34% 65
2019
Q3 		– Sell
-1,120,346
Closed -$29.7M – 61
2019
Q2 		$29.7M Sell
1,120,346
-407,867
-27% -$8.95M 1.59% 21
2019
Q1 		$28M Sell
1,528,213
-3,787,943
-71% -$62.5M 1.91% 18
2018
Q4 		$66M Sell
5,316,156
-2,288,069
-30% -$31.3M 6.06% 2
2018
Q3 		$146M Sell
7,604,225
-695,317
-8% -$11.4M 8.73% 3
2018
Q2 		$113M Buy
8,299,542
+5,382,981
+185% +$50.3M 8.14% 5
2018
Q1 		$21M Buy
+2,916,561
New +$18M 2% 15
2016
Q4 		– Sell
-1,116,777
Closed -$8.21M – 34
2016
Q3 		$8.21M Buy
+1,116,777
New +$7.24M 2.48% 12
2015
Q4 		– Sell
-2,097,185
Closed -$12.1M – 39
2015
Q3 		$12.1M Sell
2,097,185
-462,815
-18% -$2.91M 3.75% 10
2015
Q2 		$18.3M Buy
2,560,000
+150,000
+6% +$1.03M 5.33% 7
2015
Q1 		$16.3M Sell
2,410,000
-200,000
-8% -$1.42M 7.36% 7
2014
Q4 		$19.3M Buy
+2,610,000
New +$17.8M 7.13% 7

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

RTW Investments's ARWR Position: Q2 2026 in Review

RTW Investments sold out of Arrowhead Research (ARWR) in Q2 2026, closing a stake of 585,682 shares — an estimated $36.7M sold.

RTW Investments first reported a position in ARWR in Q4 2014 and held it in 14 quarters. The position peaked at $146M in Q3 2018. 501 funds tracked by Wall St. Rank hold ARWR as of Q2 2026.

  • RTW Investments reported no remaining Arrowhead Research position as of Q2 2026 after selling out during the quarter.
  • RTW Investments sold 585,682 Arrowhead Research shares in Q2 2026, an estimated $36.7M.
  • RTW Investments first reported a position in Arrowhead Research in Q4 2014 and held it in 14 quarters.
  • RTW Investments's Arrowhead Research position peaked at $146M in Q3 2018.
  • 501 funds tracked by Wall St. Rank held Arrowhead Research as of Q2 2026.

Based on RTW Investments's 13F filing for Q2 2026, filed 14 Aug 2026.