Calamos Advisors’s Arrowhead Research ARWR Stock Holding History

Calamos Advisors’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	$1.68M	Buy	20,612 +5,216	+34%	+$385K	0.01%	685
2026 Q1	$965K	Buy	+15,396	New	+$975K	﹤0.01%	794
2022 Q1	–	Sell	-29,571	Closed	-$1.96M	–	1161
2021 Q4	$1.96M	Buy	+29,571	New	+$2.03M	0.01%	909
2021 Q2	–	Sell	-27,249	Closed	-$1.81M	–	956
2021 Q1	$1.81M	Sell	27,249 -17,220	-39%	-$1.34M	0.01%	706
2020 Q4	$3.41M	Buy	+44,469	New	+$2.84M	0.02%	560
2020 Q1	–	Sell	-5,000	Closed	-$317K	–	709
2019 Q4	$317K	Sell	5,000 -6,000	-55%	-$298K	﹤0.01%	744
2019 Q3	$310K	Buy	+11,000	New	+$326K	﹤0.01%	727

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

Calamos Advisors's ARWR Position: Q2 2026 in Review

Calamos Advisors increased its Arrowhead Research (ARWR) stake by 34% in Q2 2026, buying an estimated $385K and bringing the position to 20,612 shares worth $1.68M. The position accounts for 0.01% of the portfolio, ranked #685.

Calamos Advisors first reported a position in ARWR in Q3 2019 and has held it in 7 quarters since. The position peaked at $3.41M in Q4 2020. 500 funds tracked by Wall St. Rank hold ARWR as of Q2 2026.

Calamos Advisors held 20,612 shares of Arrowhead Research worth $1.68M as of Q2 2026.
Calamos Advisors bought 5,216 Arrowhead Research shares in Q2 2026, an estimated $385K.
Arrowhead Research made up 0.01% of Calamos Advisors's portfolio in Q2 2026, its #685 holding.
Calamos Advisors first reported a position in Arrowhead Research in Q3 2019 and has held it in 7 quarters since.
Calamos Advisors's Arrowhead Research position peaked at $3.41M in Q4 2020.
500 funds tracked by Wall St. Rank held Arrowhead Research as of Q2 2026.

Based on Calamos Advisors's 13F filing for Q2 2026, filed 31 Jul 2026.