Platinum Investment Management’s Arrowhead Research ARWR Stock Holding History

Platinum Investment 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	$5.28M	Hold	64,752	–	–	1.3%	21
2026 Q1	$4.06M	Sell	64,752 -24,732	-28%	-$1.57M	1.02%	37
2025 Q4	$5.94M	Sell	89,484 -21,538	-19%	-$1.06M	1.37%	20
2025 Q3	$3.83M	Hold	111,022	–	–	0.25%	45
2025 Q2	$1.75M	Buy	111,022 +12,613	+13%	+$181K	0.12%	58
2025 Q1	$1.25M	Buy	98,409 +9,984	+11%	+$182K	0.07%	66
2024 Q4	$1.66M	Hold	88,425	–	–	0.1%	64
2024 Q3	$1.71M	Hold	88,425	–	–	0.08%	71
2024 Q2	$2.3M	Sell	88,425 -8,743	-9%	-$215K	0.09%	62
2024 Q1	$2.78M	Hold	97,168	–	–	0.11%	61
2023 Q4	$2.97M	Hold	97,168	–	–	0.12%	69
2023 Q3	$2.61M	Hold	97,168	–	–	0.1%	71
2023 Q2	$3.47M	Buy	97,168 +20,960	+28%	+$723K	0.12%	68
2023 Q1	$1.94M	Buy	+76,208	New	+$2.4M	0.07%	84

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

Platinum Investment Management's ARWR Position: Q2 2026 in Review

Platinum Investment Management held its Arrowhead Research (ARWR) position steady in Q2 2026 at 64,752 shares worth $5.28M. The position accounts for 1.3% of the portfolio, ranked #21.

Platinum Investment Management first reported a position in ARWR in Q1 2023 and has held it in 14 quarters since. The position peaked at $5.94M in Q4 2025. 500 funds tracked by Wall St. Rank hold ARWR as of Q2 2026.

Platinum Investment Management held 64,752 shares of Arrowhead Research worth $5.28M as of Q2 2026.
Platinum Investment Management left its Arrowhead Research share count unchanged in Q2 2026.
Arrowhead Research made up 1.3% of Platinum Investment Management's portfolio in Q2 2026, its #21 holding.
Platinum Investment Management first reported a position in Arrowhead Research in Q1 2023 and has held it in 14 quarters since.
Platinum Investment Management's Arrowhead Research position peaked at $5.94M in Q4 2025.
500 funds tracked by Wall St. Rank held Arrowhead Research as of Q2 2026.

Based on Platinum Investment Management's 13F filing for Q2 2026, filed 13 Aug 2026.