SL
ARWR icon

Siren LLC’s Arrowhead Research ARWR Stock Holding History

Siren LLC’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 		$140M Buy
1,715,476
+100,000
+6% +$7.39M 2.83% 8
2026
Q1 		$101M Buy
1,615,476
+115,000
+8% +$7.28M 2.81% 9
2025
Q4 		$99.6M Sell
1,500,476
-1,169,404
-44% -$57.3M 2.97% 7
2025
Q3 		$92.1M Hold
2,669,880
– – 3.6% 4
2025
Q2 		$42.2M Hold
2,669,880
– – 2.18% 12
2025
Q1 		$34M Sell
2,669,880
-231,801
-8% -$4.21M 1.92% 15
2024
Q4 		$54.6M Buy
2,901,681
+442,903
+18% +$9.12M 2.41% 8
2024
Q3 		$47.6M Buy
+2,458,778
New +$60M 2.38% 14

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

Siren LLC's ARWR Position: Q2 2026 in Review

Siren LLC increased its Arrowhead Research (ARWR) stake by 6.2% in Q2 2026, buying an estimated $7.39M and bringing the position to 1,715,476 shares worth $140M. The position accounts for 2.83% of the portfolio, ranked #8.

Siren LLC first reported a position in ARWR in Q3 2024 and has held it in 8 quarters since. 500 funds tracked by Wall St. Rank hold ARWR as of Q2 2026.

  • Siren LLC held 1,715,476 shares of Arrowhead Research worth $140M as of Q2 2026.
  • Siren LLC bought 100,000 Arrowhead Research shares in Q2 2026, an estimated $7.39M.
  • Arrowhead Research made up 2.83% of Siren LLC's portfolio in Q2 2026, its #8 holding.
  • Siren LLC first reported a position in Arrowhead Research in Q3 2024 and has held it in 8 quarters since.
  • 500 funds tracked by Wall St. Rank held Arrowhead Research as of Q2 2026.

Based on Siren LLC's 13F filing for Q2 2026, filed 13 Aug 2026.