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Thomas Steyer’s Arrowhead Research ARWR Stock Holding History

Thomas Steyer’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
-15,800
Closed -$991K – 99
2026
Q1 		$991K Hold
15,800
– – 0.01% 100
2025
Q4 		$1.05M Hold
15,800
– – ﹤0.01% 86
2025
Q3 		$545K Hold
15,800
– – ﹤0.01% 89
2025
Q2 		$250K Hold
15,800
– – ﹤0.01% 113
2025
Q1 		$201K Sell
15,800
-613,000
-97% -$11.1M ﹤0.01% 123
2024
Q4 		$11.8M Buy
+628,800
New +$12.9M 0.05% 81
2023
Q3 		– Sell
-5,800
Closed -$207K – 167
2023
Q2 		$207K Buy
+5,800
New +$200K ﹤0.01% 136
2022
Q2 		– Sell
-142,700
Closed -$6.56M – 315
2022
Q1 		$6.56M Sell
142,700
-177,917
-55% -$8.81M 0.03% 172
2021
Q4 		$21.3M Sell
320,617
-475,961
-60% -$32.7M 0.11% 93
2021
Q3 		$49.7M Buy
796,578
+431,578
+118% +$27.9M 0.23% 75
2021
Q2 		$30.2M Buy
365,000
+192,546
+112% +$14.3M 0.12% 88
2021
Q1 		$11.4M Buy
172,454
+104,854
+155% +$8.14M 0.06% 130
2020
Q4 		$5.19M Sell
67,600
-356,000
-84% -$22.8M 0.03% 123
2020
Q3 		$18.2M Sell
423,600
-376,400
-47% -$16.2M 0.13% 87
2020
Q2 		$34.6M Sell
800,000
-200,000
-20% -$7.06M 0.28% 68
2020
Q1 		$28.8M Buy
1,000,000
+900,000
+900% +$36.3M 0.25% 57
2019
Q4 		$6.34M Sell
100,000
-550,000
-85% -$27.3M 0.04% 106
2019
Q3 		$18.3M Sell
650,000
-1,350,000
-68% -$40M 0.14% 75
2019
Q2 		$53M Buy
2,000,000
+79,391
+4% +$1.74M 0.34% 55
2019
Q1 		$35.2M Buy
1,920,609
+420,609
+28% +$6.94M 0.27% 59
2018
Q4 		$18.6M Buy
+1,500,000
New +$20.5M 0.14% 66

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

Thomas Steyer's ARWR Position: Q2 2026 in Review

Thomas Steyer sold out of Arrowhead Research (ARWR) in Q2 2026, closing a stake of 15,800 shares — an estimated $991K sold.

Thomas Steyer first reported a position in ARWR in Q4 2018 and held it in 21 quarters. The position peaked at $53M in Q2 2019. 498 funds tracked by Wall St. Rank hold ARWR as of Q2 2026.

  • Thomas Steyer reported no remaining Arrowhead Research position as of Q2 2026 after selling out during the quarter.
  • Thomas Steyer sold 15,800 Arrowhead Research shares in Q2 2026, an estimated $991K.
  • Thomas Steyer first reported a position in Arrowhead Research in Q4 2018 and held it in 21 quarters.
  • Thomas Steyer's Arrowhead Research position peaked at $53M in Q2 2019.
  • 498 funds tracked by Wall St. Rank held Arrowhead Research as of Q2 2026.

Based on Farallon Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.