Weiss Asset Management’s Arrowhead Research ARWR Stock Holding History

Weiss Asset 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	$10.9M	Buy	+134,014	New	+$9.9M	0.11%	136
2026 Q1	–	Sell	-111,375	Closed	-$7.39M	–	516
2025 Q4	$7.39M	Buy	+111,375	New	+$5.46M	0.1%	162
2018 Q2	–	Sell	-16,017	Closed	-$115K	–	202
2018 Q1	$115K	Sell	16,017 -3,076	-16%	-$18.9K	0.01%	201
2017 Q4	$70K	Buy	+19,093	New	+$70.9K	0.01%	240

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

Weiss Asset Management's ARWR Position: Q2 2026 in Review

Weiss Asset Management opened a new position in Arrowhead Research (ARWR) in Q2 2026: 134,014 shares worth $10.9M. The stake represents 0.11% of the portfolio and ranks #136 among its holdings. This is a return to the name: Weiss Asset Management previously reported a position in ARWR as recently as Q4 2025.

Weiss Asset Management first reported a position in ARWR in Q4 2017 and has held it in 4 quarters since. 500 funds tracked by Wall St. Rank hold ARWR as of Q2 2026.

Weiss Asset Management held 134,014 shares of Arrowhead Research worth $10.9M as of Q2 2026.
Arrowhead Research was a new Weiss Asset Management position in Q2 2026.
Arrowhead Research made up 0.11% of Weiss Asset Management's portfolio in Q2 2026, its #136 holding.
Weiss Asset Management first reported a position in Arrowhead Research in Q4 2017 and has held it in 4 quarters since.
500 funds tracked by Wall St. Rank held Arrowhead Research as of Q2 2026.

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