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Deerfield Management’s Arrowhead Research ARWR Stock Holding History

Deerfield Management’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 		$113M Sell
1,389,055
-184,242
-12% -$13.6M 1.18% 24
2026
Q1 		$98.6M Sell
1,573,297
-259,649
-14% -$16.4M 1.16% 22
2025
Q4 		$122M Buy
1,832,946
+839,946
+85% +$41.2M 1.55% 19
2025
Q3 		$34.2M Buy
+993,000
New +$21.8M 0.52% 45
2024
Q4 		– Sell
-26,439
Closed -$512K – 139
2024
Q3 		$512K Buy
26,439
+6,978
+36% +$170K 0.01% 283
2024
Q2 		$506K Buy
+19,461
New +$478K 0.01% 261
2014
Q1 		– Sell
-142,017
Closed -$1.54M – 126
2013
Q4 		$1.54M Buy
+142,017
New +$1.14M 0.08% 91

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

Deerfield Management's ARWR Position: Q2 2026 in Review

Deerfield Management reduced its Arrowhead Research (ARWR) stake by 12% in Q2 2026, selling an estimated $13.6M and leaving 1,389,055 shares worth $113M. The position accounts for 1.18% of the portfolio, ranked #24.

Deerfield Management first reported a position in ARWR in Q4 2013 and has held it in 7 quarters since. The position peaked at $122M in Q4 2025. 500 funds tracked by Wall St. Rank hold ARWR as of Q2 2026.

  • Deerfield Management held 1,389,055 shares of Arrowhead Research worth $113M as of Q2 2026.
  • Deerfield Management sold 184,242 Arrowhead Research shares in Q2 2026, an estimated $13.6M.
  • Arrowhead Research made up 1.18% of Deerfield Management's portfolio in Q2 2026, its #24 holding.
  • Deerfield Management first reported a position in Arrowhead Research in Q4 2013 and has held it in 7 quarters since.
  • Deerfield Management's Arrowhead Research position peaked at $122M in Q4 2025.
  • 500 funds tracked by Wall St. Rank held Arrowhead Research as of Q2 2026.

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