American Century Companies’s Arrowhead Research ARWR Stock Holding History

American Century Companies’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	$29.7M	Sell	364,211 -287,333	-44%	-$21.2M	0.01%	1090
2026 Q1	$40.9M	Buy	651,544 +643,802	+8,316%	+$40.8M	0.02%	846
2025 Q4	$514K	Buy	+7,742	New	+$379K	﹤0.01%	2509
2022 Q2	–	Sell	-5,791	Closed	-$266K	–	2309
2022 Q1	$266K	Sell	5,791 -7,195	-55%	-$356K	﹤0.01%	2105
2021 Q4	$861K	Buy	12,986 +1,474	+13%	+$101K	﹤0.01%	1717
2021 Q3	$719K	Buy	11,512 +1,279	+12%	+$82.8K	﹤0.01%	1738
2021 Q2	$847K	Buy	10,233 +515	+5%	+$38.3K	﹤0.01%	1629
2021 Q1	$644K	Buy	9,718 +2,504	+35%	+$194K	﹤0.01%	1625
2020 Q4	$554K	Buy	7,214 +761	+12%	+$48.7K	﹤0.01%	1509
2020 Q3	$278K	Buy	6,453 +718	+13%	+$31K	﹤0.01%	1577
2020 Q2	$248K	Sell	5,735 -26,976	-82%	-$952K	﹤0.01%	1522
2020 Q1	$941K	Buy	32,711 +2,139	+7%	+$86.3K	﹤0.01%	1002
2019 Q4	$1.94M	Sell	30,572 -96,723	-76%	-$4.8M	﹤0.01%	950
2019 Q3	$3.59M	Sell	127,295 -53,398	-30%	-$1.58M	﹤0.01%	872
2019 Q2	$4.79M	Buy	180,693 +126,152	+231%	+$2.77M	﹤0.01%	845
2019 Q1	$1M	Buy	+54,541	New	+$900K	﹤0.01%	1058

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

American Century Companies's ARWR Position: Q2 2026 in Review

American Century Companies reduced its Arrowhead Research (ARWR) stake by 44% in Q2 2026, selling an estimated $21.2M and leaving 364,211 shares worth $29.7M. The position accounts for 0.01% of the portfolio, ranked #1090.

American Century Companies first reported a position in ARWR in Q1 2019 and has held it in 16 quarters since. The position peaked at $40.9M in Q1 2026. 500 funds tracked by Wall St. Rank hold ARWR as of Q2 2026.

American Century Companies held 364,211 shares of Arrowhead Research worth $29.7M as of Q2 2026.
American Century Companies sold 287,333 Arrowhead Research shares in Q2 2026, an estimated $21.2M.
Arrowhead Research made up 0.01% of American Century Companies's portfolio in Q2 2026, its #1090 holding.
American Century Companies first reported a position in Arrowhead Research in Q1 2019 and has held it in 16 quarters since.
American Century Companies's Arrowhead Research position peaked at $40.9M in Q1 2026.
500 funds tracked by Wall St. Rank held Arrowhead Research as of Q2 2026.

Based on American Century Companies's 13F filing for Q2 2026, filed 12 Aug 2026.