Arrowhead Pharmaceuticals Inc
Ownership
Ownership Structure
Who owns Arrowhead Pharmaceuticals Inc (ARWR)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 86.7% of the shares are freely tradable; institutional investors hold 88.6%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 12.86 | 18,161,519 | -14.8 | 03/31/2026 |
| venBio Select Advisor LLC | 7.58 | 10,699,999 | +0.7 | 03/31/2026 |
| FMR Inc | 5.14 | 7,266,652 | +11.4 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 5.06 | 7,146,136 | +0.0 | 03/31/2026 |
| State Street Corp | 4.60 | 6,496,130 | +1.4 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.27 | 6,032,416 | +0.0 | 03/31/2026 |
| Geode Capital Management, LLC | 3.03 | 4,278,828 | +31.1 | 03/31/2026 |
| NORGES BANK | 2.76 | 3,896,536 | +128.6 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Mid-Cap ETF | 3.49 | 4,933,309 | +0.0 | 08/31/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.02 | 4,260,142 | +0.3 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Perry Michael S | Director | 111,459 | 7,412,024 $ | Aug 18, 2026 | direct |
| Olukotun Adeoye Y | Director | 31,600 | 2,101,400 $ | Aug 18, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 18, 2026 | Perry Michael S | Director | Sell | 11,600 | 87.30 | 1,012,680 |
| Aug 18, 2026 | Olukotun Adeoye Y | Director | Sell | 2,000 | 86.96 | 173,920 |
| Apr 23, 2026 | James C Hamilton | Insider | Sell | 10,000 | 75.00 | 750,000 |
| Apr 22, 2026 | Daniel Joseph Apel | CFO | Sell | 13,095 | 71.35 | 934,328 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 18, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.