Marshall Wace’s Arrowhead Research ARWR Stock Holding History

Marshall Wace’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	$24.9M	Buy	305,031 +125,458	+70%	+$9.27M	0.02%	630
2026 Q1	$11.3M	Buy	179,573 +55,718	+45%	+$3.53M	0.01%	918
2025 Q4	$8.22M	Sell	123,855 -1,312,985	-91%	-$64.4M	0.01%	943
2025 Q3	$49.6M	Sell	1,436,840 -719,158	-33%	-$15.8M	0.05%	321
2025 Q2	$34.1M	Buy	2,155,998 +2,096,238	+3,508%	+$30.1M	0.04%	403
2025 Q1	$761K	Sell	59,760 -26,873	-31%	-$489K	﹤0.01%	1897
2024 Q4	$1.63M	Buy	+86,633	New	+$1.78M	﹤0.01%	1526
2023 Q4	–	Sell	-107,648	Closed	-$2.89M	–	2158
2023 Q3	$2.89M	Sell	107,648 -193,393	-64%	-$5.92M	0.01%	1067
2023 Q2	$10.7M	Buy	+301,041	New	+$10.4M	0.02%	702
2022 Q2	–	Sell	-182,799	Closed	-$8.41M	–	3397
2022 Q1	$8.41M	Buy	+182,799	New	+$9.05M	0.02%	1001
2021 Q3	–	Sell	-250,380	Closed	-$20.7M	–	3002
2021 Q2	$20.7M	Buy	+250,380	New	+$18.6M	0.09%	227
2021 Q1	–	Sell	-287,817	Closed	-$22.1M	–	2453
2020 Q4	$22.1M	Buy	+287,817	New	+$18.4M	0.12%	172

Other funds holding ARWR

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 Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Norges Bank Oslo, Norway $1T AUM

Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return

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

Marshall Wace's ARWR Position: Q2 2026 in Review

Marshall Wace increased its Arrowhead Research (ARWR) stake by 70% in Q2 2026, buying an estimated $9.27M and bringing the position to 305,031 shares worth $24.9M. The position accounts for 0.02% of the portfolio, ranked #630.

Marshall Wace first reported a position in ARWR in Q4 2020 and has held it in 12 quarters since. The position peaked at $49.6M in Q3 2025. 500 funds tracked by Wall St. Rank hold ARWR as of Q2 2026.

Marshall Wace held 305,031 shares of Arrowhead Research worth $24.9M as of Q2 2026.
Marshall Wace bought 125,458 Arrowhead Research shares in Q2 2026, an estimated $9.27M.
Arrowhead Research made up 0.02% of Marshall Wace's portfolio in Q2 2026, its #630 holding.
Marshall Wace first reported a position in Arrowhead Research in Q4 2020 and has held it in 12 quarters since.
Marshall Wace's Arrowhead Research position peaked at $49.6M in Q3 2025.
500 funds tracked by Wall St. Rank held Arrowhead Research as of Q2 2026.

Based on Marshall Wace's 13F filing for Q2 2026, filed 13 Aug 2026.