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 | 10.50 | 14,830,553 | -18.3 | 06/30/2026 |
| venBio Select Advisor LLC | 8.04 | 11,355,555 | +6.1 | 06/30/2026 |
| FMR Inc | 5.69 | 8,039,804 | +10.6 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 4.50 | 6,351,355 | -11.1 | 06/30/2026 |
| Vanguard Capital Management, LLC | 4.33 | 6,110,953 | +1.3 | 06/30/2026 |
| State Street Corp | 4.03 | 5,694,640 | -12.3 | 06/30/2026 |
| NORGES BANK | 2.76 | 3,896,536 | +128.6 | 06/30/2026 |
| Amvescap Plc. | 2.75 | 3,883,976 | +18.4 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Mid-Cap ETF | 3.56 | 5,031,501 | +0.0 | 09/30/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.02 | 4,266,874 | +0.3 | 09/30/2026 |
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 | 6,877,020 $ | Aug 18, 2026 | direct |
| Olukotun Adeoye Y | Director | 31,600 | 1,949,720 $ | 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: November 4, 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.