$ARWR

$59.03 +$0.00 (0.0%) After hours

$ARWR Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 141.3M shares outstanding

Who owns ARWR?

By type of holder

Institutions 84.0% Insiders 4.1% Everyone else 11.9%

Concentration Top 10 holders own 47.8%

BlackRock, Inc. 10.5% · Avoro Capital Advisors LLC 8.0%

Institutional ownership

84.0%

-1.5 pts vs last qtr

Institutional holders

499

+62 vs last qtr

Net shares bought

−2.1M

by institutions in Q2 2026

New / sold out

127 / 65

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Norges Bank NEW +3.9M
Jupiter Topco LLC NEW +1.2M

Biggest sellers in Q2 2026

BlackRock, Inc. −3.3M
Janus Henderson Group PLC SOLD OUT −1.4M

Who is planning to sell?

Notices of proposed sale, last 12 months

$36.2M

19 notices from 10 people

Shares covered

546.9K

0.39% of the company

Arranged in advance

47%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Christopher Anzalone Officer $24M
James Hamilton Officer 10b5-1 $3.93M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2017–FY2025

+81.0%

+7.70% a year

Each share's claim on the business

−44.8%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $485M

over 9 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years55% 3–5 years11% 1–3 years9% Under 1 year25%

Quarterly turnover

15.5%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting ARWR on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	14.8M	10.50%	−3.3M (−18.3%)	≤2021	0.0%
Shares held by quarter Peak holding21.3M (Q4'25) Change over 8 quarters−1.0M Share of the company10.500% BlackRock, Inc.'s full portfolio →
AC Avoro Capital Advisors LLC	11.4M	8.04%	+655.6K (+6.1%)	2023	8.3%
Shares held by quarter Peak holding11.4M (Q2'26) Change over 8 quarters+2.5M Share of the company8.040% Avoro Capital Advisors LLC's full portfolio →

BlackRock, Inc.

14.8M

% of company

10.50%

Change vs last qtr

−3.3M (−18.3%)

Held since

≤2021

Avoro Capital Advisors LLC

11.4M

% of company

8.04%

Change vs last qtr

+655.6K (+6.1%)

Held since

2023

28 more super investors behind a free account

See every manager holding Arrowhead Pharmaceuticals, Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting ARWR on Form N-PORT; together they hold 41.9% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IC iShares Core S&P Mid-Cap ETF iShares Trust	$393M	4.8M	3.41%	0.32%	June 30, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$346M	4.2M	3.01%	0.02%	June 30, 2026

iShares Core S&P Mid-Cap ETF

iShares Trust

Position value

$393M

% of company

3.41%

% of the fund

0.32%

As of

June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$346M

% of company

3.01%

% of the fund

0.02%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Arrowhead Pharmaceuticals, Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
AC Anzalone Christopher Richard Insider	3.8M	2.69%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company2.690% Anzalone Christopher Richard's insider activity →
OP O'Brien Patrick Insider	547.4K	0.39%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.390% O'Brien Patrick's insider activity →

Anzalone Christopher Richard

Insider

3.8M

% of company

2.69%

Change vs last qtr

—

Held since

—

O'Brien Patrick

Insider

547.4K

% of company

0.39%

Change vs last qtr

—

Held since

—

12 more holders behind a free account

See every insider and 5%+ holder of Arrowhead Pharmaceuticals, Inc..

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