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David Greenspan’s Arrowhead Research ARWR Stock Holding History

David Greenspan’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
Q1 		– Sell
-2,523,500
Closed -$168M – 47
2025
Q4 		$168M Sell
2,523,500
-2,458,500
-49% -$120M 2.26% 20
2025
Q3 		$172M Sell
4,982,000
-250,000
-5% -$5.5M 2.66% 12
2025
Q2 		$82.7M Hold
5,232,000
– – 1.43% 30
2025
Q1 		$66.7M Hold
5,232,000
– – 1.2% 32
2024
Q4 		$98.4M Buy
5,232,000
+347,000
+7% +$7.15M 1.78% 26
2024
Q3 		$94.6M Buy
4,885,000
+746,000
+18% +$18.2M 1.46% 28
2024
Q2 		$108M Hold
4,139,000
– – 2.05% 19
2024
Q1 		$118M Buy
4,139,000
+2,810,000
+211% +$89.9M 2.35% 16
2023
Q4 		$40.7M Buy
+1,329,000
New +$35.3M 0.9% 32

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
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
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
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
VPC
Vestal Point Capital New York $4.28B AUM 239% 1-Year Est. Return

David Greenspan's ARWR Position: Q1 2026 in Review

David Greenspan sold out of Arrowhead Research (ARWR) in Q1 2026, closing a stake of 2,523,500 shares — an estimated $168M sold.

David Greenspan first reported a position in ARWR in Q4 2023 and held it in 9 quarters. The position peaked at $172M in Q3 2025. 437 funds tracked by Wall St. Rank hold ARWR as of Q1 2026.

  • David Greenspan reported no remaining Arrowhead Research position as of Q1 2026 after selling out during the quarter.
  • David Greenspan sold 2,523,500 Arrowhead Research shares in Q1 2026, an estimated $168M.
  • David Greenspan first reported a position in Arrowhead Research in Q4 2023 and held it in 9 quarters.
  • David Greenspan's Arrowhead Research position peaked at $172M in Q3 2025.
  • 437 funds tracked by Wall St. Rank held Arrowhead Research as of Q1 2026.

Based on Slate Path Capital's 13F filing for Q1 2026, filed 15 May 2026.