ARROWHEAD PHARMACEUTICALS IN ARWR
COM · Common Stock · CUSIP 04280A100 · ISIN US04280A1007
Biopharmaceutical company
- SectorHealth care
- IndustryPharmaceutical Preparations
- HeadquartersPasadena, CA
- Founded1989
- Websitearrowheadpharma.com
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($12.7m this quarter). Holder counts are more reliable. Shares outstanding: 141.3m as of 2026-07-30, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $81.55. Options: 16 managers hold calls ($157.9m notional), 14 hold puts ($66.2m).
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 278 |
| Q4 2022 | 283 |
| Q1 2023 | 257 |
| Q2 2023 | 274 |
| Q3 2023 | 258 |
| Q4 2023 | 267 |
| Q1 2024 | 276 |
| Q2 2024 | 274 |
| Q3 2024 | 273 |
| Q4 2024 | 271 |
| Q1 2025 | 266 |
| Q2 2025 | 282 |
| Q3 2025 | 303 |
| Q4 2025 | 402 |
| Q1 2026 | 438 |
| Q2 2026 | 500 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2024 | 121 | 123 |
| Q4 2024 | 122 | 127 |
| Q1 2025 | 130 | 126 |
| Q2 2025 | 151 | 120 |
| Q3 2025 | 165 | 121 |
| Q4 2025 | 234 | 137 |
| Q1 2026 | 264 | 171 |
| Q2 2026 | 271 | 214 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2025 | $39.1m | $9.8m | 0.25 |
| Q4 2025 | $156.8m | $38.8m | 0.25 |
| Q1 2026 | $106.3m | $55.8m | 0.53 |
| Q2 2026 | $157.9m | $66.2m | 0.42 |
Biggest buyers
| FIRST TRUST ADVISORS LP | Added | +1.2m |
| Holocene Advisors, LP | New | +1.1m |
| FMR LLC | Added | +773.2k |
| Avoro Capital Advisors LLC | Added | +655.6k |
| Invesco Ltd. | Added | +603.3k |
| DIMENSIONAL FUND ADVISORS LP | Added | +573.1k |
| TWO SIGMA INVESTMENTS, LP | Added | +544.8k |
| 1832 Asset Management L.P. | New | +538.5k |
| HRT FINANCIAL LP | New | +498.7k |
| Assenagon Asset Management S.A. | Added | +345.1k |
Biggest sellers
| BlackRock, Inc. | Reduced | -3.3m |
| STATE STREET CORP | Reduced | -801.5k |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Reduced | -794.8k |
| D. E. Shaw & Co., Inc. | Reduced | -752.3k |
| GEODE CAPITAL MANAGEMENT, LLC | Reduced | -748.2k |
| Vestal Point Capital, LP | Reduced | -700.0k |
| Pictet Asset Management Holding SA | Reduced | -699.8k |
| GOLDMAN SACHS GROUP INC | Reduced | -589.9k |
| RTW INVESTMENTS, LP | Sold out | -585.7k |
| RENAISSANCE TECHNOLOGIES LLC | Reduced | -567.6k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $70.7m867.6k shares |
| Caption Management, LLC | Added | $25.7m315.6k shares |
| CITADEL ADVISORS LLC | Added | $21.8m266.9k shares |
| JANE STREET GROUP, LLC | Reduced | $11.1m136.6k shares |
| MILLENNIUM MANAGEMENT LLC | New | $6.4m78.2k shares |
| GROUP ONE TRADING LLC | Added | $5.8m71.4k shares |
| IMC-Chicago, LLC | New | $5.7m70.2k shares |
| CITIGROUP INC | Added | $3.2m38.7k shares |
| SIMPLEX TRADING, LLC | Added | $2.5m31.2k shares |
| Point72 Asset Management, L.P. | Reduced | $2.0m24.5k shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $34.6m424.5k shares |
| JANE STREET GROUP, LLC | Reduced | $8.2m100.2k shares |
| Ikarian Capital, LLC | Added | $8.2m100.0k shares |
| CITADEL ADVISORS LLC | Reduced | $4.8m59.1k shares |
| BOOTHBAY FUND MANAGEMENT, LLC | Added | $2.4m29.6k shares |
| CITIGROUP INC | Added | $2.2m26.7k shares |
| HRT FINANCIAL LP | Added | $1.5m18.9k shares |
| Point72 Asset Management, L.P. | Added | $1.3m15.4k shares |
| IMC-Chicago, LLC | New | $1.1m13.9k shares |
| SIMPLEX TRADING, LLC | Reduced | $1.0m12.3k shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| BlackRock, Inc. 13G · institution -2.1 pts · filed 2026-07-27 | 10.1% |
| Avoro Capital Advisors LLC 13G · institution +1.3 pts · filed 2026-08-14 | 9.6% |
| FMR LLC 13G · institution new · filed 2026-05-06 | 5.2% |
| VANGUARD CAPITAL MANAGEMENT LLC 13G · institution new · filed 2026-04-29 | 5.0% |
Fell to 5% or below in the last year: VANGUARD PORTFOLIO MANAGEMENT LLC (4.5%, 2026-07-31; now reported by VANGUARD CAPITAL MANAGEMENT LLC), VANGUARD GROUP INC (0.0%, 2026-03-26; now reported by VANGUARD CAPITAL MANAGEMENT LLC)
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 0 | — | 5 | $1.4m | $1.4m |
| Q1 2025 | 0 | — | 5 | $8.6m | $7.8m |
| Q2 2025 | 0 | — | 1 | $1.5m | — |
| Q3 2025 | 0 | — | 1 | $1.0m | $1.0m |
| Q4 2025 | 0 | — | 7 | $27.8m | $8.5m |
| Q1 2026 | 0 | — | 3 | $7.2m | $7.2m |
| Q2 2026 | 0 | — | 3 | $1.9m | $1.9m |
| Q3 2026 | 0 | — | 2 | $1.2m | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2026-08-18 | PERRY MICHAEL S Director | Sold | $1.0m11.6k shares |
| 2026-08-18 | OLUKOTUN ADEOYE Y Director | Sold | $173.9k2.0k shares |
| 2026-05-12 | Lu Hongbo Director | Sold plan | $228.3k3.0k shares |
| 2026-04-23 | Hamilton James C Chief Medical Officer | Sold plan | $750.0k10.0k shares |
| 2026-04-22 | Apel Daniel Joseph Chief Financial Officer | Sold plan | $934.3k13.1k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| BlackRock, Inc. 0.02% of their portfolio | 14.8m $1.2bn | Reduced -3.3m |
| Avoro Capital Advisors LLC 8.31% of their portfolio | 11.4m $925.6m | Added +655.6k |
| FMR LLC 0.03% of their portfolio | 8.0m $655.3m | Added +773.2k |
| VANGUARD PORTFOLIO MANAGEMENT LLC 0.02% of their portfolio | 6.4m $517.7m | Reduced -794.8k |
| VANGUARD CAPITAL MANAGEMENT LLC 0.01% of their portfolio | 6.1m $498.1m | Added +78.5k |
| STATE STREET CORP 0.01% of their portfolio | 5.7m $464.2m | Reduced -801.5k |
| NORGES BANK 0.03% of their portfolio | 3.9m $317.6m | Not comparable |
| Invesco Ltd. 0.03% of their portfolio | 3.9m $316.6m | Added +603.3k |
| GEODE CAPITAL MANAGEMENT, LLC 0.02% of their portfolio | 3.5m $298.8m | Reduced -748.2k |
| FRED ALGER MANAGEMENT, LLC 0.90% of their portfolio | 3.3m $269.1m | Reduced -40.6k |
| BAKER BROS. ADVISORS LP 0.81% of their portfolio | 2.0m $162.4m | Unchanged |
| Siren, L.L.C. 2.84% of their portfolio | 1.7m $139.8m | Added +100.0k |
| Vestal Point Capital, LP 3.00% of their portfolio | 1.6m $128.4m | Reduced -700.0k |
| DEERFIELD MANAGEMENT COMPANY, L.P. 1.18% of their portfolio | 1.4m $113.2m | Reduced -184.2k |
| FIRST TRUST ADVISORS LP 0.06% of their portfolio | 1.4m $110.3m | Added +1.2m |
| Driehaus Capital Management LLC 0.64% of their portfolio | 1.4m $110.1m | Added +160.2k |
| Jupiter Topco LLC 0.04% of their portfolio | 1.2m $99.6m | First filing |
| NORTHERN TRUST CORP 0.01% of their portfolio | 1.2m $97.2m | Reduced -463.0k |
| DIMENSIONAL FUND ADVISORS LP 0.02% of their portfolio | 1.2m $96.3m | Added +573.1k |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 1.2m $93.7m | Reduced -589.9k |
| BANK OF AMERICA CORP /DE/ 0.01% of their portfolio | 1.1m $92.9m | Added +75.4k |
| Hood River Capital Management LLC 0.66% of their portfolio | 1.1m $91.4m | Added +64.2k |
| Holocene Advisors, LP 0.21% of their portfolio | 1.1m $90.2m | New |
| MORGAN STANLEY 0.00% of their portfolio | 1.1m $88.4m | Added +124.3k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.01% of their portfolio | 964.5k $78.6m | Reduced -366.5k |
| Fisher Asset Management, LLC 0.02% of their portfolio | 957.7k $78.1m | Reduced -155.9k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 923.9k $75.3m | Reduced -268.2k |
| VANGUARD FIDUCIARY TRUST CO 0.02% of their portfolio | 896.7k $73.1m | Reduced -69.0k |
| UBS Group AG 0.01% of their portfolio | 861.5k $70.2m | Reduced -474.8k |
| Bank of New York Mellon Corp 0.01% of their portfolio | 859.5k $70.1m | Reduced -100.6k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.01% of their portfolio | 853.4k $69.6m | Reduced -190.4k |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC 1.76% of their portfolio | 830.2k $67.7m | Added +290.1k |
| Western Financial Corp/CA 19.58% of their portfolio | 820.2k $66.9m | Unchanged |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 637.4k $51.8m | Reduced -45.7k |
| Connor, Clark & Lunn Investment Management Ltd. 0.10% of their portfolio | 625.6k $51.0m | Reduced -211.4k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.04% of their portfolio | 596.6k $48.6m | Added +217.7k |
| TWO SIGMA INVESTMENTS, LP 0.04% of their portfolio | 580.6k $47.3m | Added +544.8k |
| Pictet Asset Management Holding SA 0.04% of their portfolio | 573.4k $46.7m | Reduced -699.8k |
| BNP PARIBAS FINANCIAL MARKETS 0.02% of their portfolio | 558.6k $45.5m | Reduced -92.0k |
| LORD, ABBETT & CO. LLC 0.13% of their portfolio | 540.5k $44.1m | Added +227.6k |
| 1832 Asset Management L.P. 0.05% of their portfolio | 538.5k $43.9m | New |
| PRINCIPAL FINANCIAL GROUP INC 0.02% of their portfolio | 514.7k $41.9m | Added +24.5k |
| HRT FINANCIAL LP 0.10% of their portfolio | 498.7k $40.6m | New |
| VOYA INVESTMENT MANAGEMENT LLC 0.03% of their portfolio | 483.5k $39.4m | Reduced -172.6k |
| Balyasny Asset Management L.P. 0.07% of their portfolio | 470.8k $38.4m | Added +264.3k |
| RENAISSANCE TECHNOLOGIES LLC 0.05% of their portfolio | 468.9k $38.2m | Reduced -567.6k |
| FRANKLIN RESOURCES INC 0.01% of their portfolio | 462.1k $37.7m | Reduced -574 |
| D. E. Shaw & Co., Inc. 0.02% of their portfolio | 431.6k $35.2m | Reduced -752.3k |
| Nuveen, LLC 0.01% of their portfolio | 415.9k $33.9m | Reduced -84.0k |
| Assenagon Asset Management S.A. 0.02% of their portfolio | 403.9k $32.9m | Added +345.1k |
| RHUMBLINE ADVISERS 0.02% of their portfolio | 374.9k $30.6m | Reduced -29.5k |
| EVENTIDE ASSET MANAGEMENT, LLC 0.40% of their portfolio | 370.0k $30.2m | Unchanged |
| AMERICAN CENTURY COMPANIES INC 0.01% of their portfolio | 364.2k $29.7m | Reduced -287.3k |
| MILLENNIUM MANAGEMENT LLC 0.02% of their portfolio | 329.3k $26.8m | New |
| LPL Financial LLC 0.01% of their portfolio | 310.8k $25.3m | Added +181.3k |
| Artisan Partners Limited Partnership 0.04% of their portfolio | 310.7k $25.3m | New |
| MARSHALL WACE, LLP 0.02% of their portfolio | 305.0k $24.9m | Added +125.5k |
| SEI INVESTMENTS CO 0.02% of their portfolio | 300.6k $24.5m | Added +97.4k |
| NORDEA INVESTMENT MANAGEMENT AB 0.02% of their portfolio | 284.2k $23.6m | Reduced -22.3k |
| Russell Investments Group, Ltd. 0.02% of their portfolio | 284.1k $23.2m | Added +110.1k |
| CITIGROUP INC 0.01% of their portfolio | 264.7k $21.6m | Added +13.1k |
| California Public Employees Retirement System 0.01% of their portfolio | 256.3k $20.9m | Reduced -819 |
| Squarepoint Ops LLC 0.04% of their portfolio | 255.9k $20.9m | New |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 254.2k $20.7m | Added +187.5k |
| Aberdeen Group plc 0.03% of their portfolio | 252.0k $20.5m | Reduced -112.0k |
| Swiss National Bank 0.01% of their portfolio | 238.9k $19.5m | Reduced -3.1k |
| Legal & General Group Plc 0.00% of their portfolio | 237.2k $19.3m | Added +8.1k |
| Privium Fund Management B.V. 3.51% of their portfolio | 234.2k $19.1m | Reduced -132.7k |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 0.01% of their portfolio | 218.1k $17.8m | Reduced -369.0k |
| Life Cycle Investment Partners Ltd 0.08% of their portfolio | 209.1k $17.0m | New |
| HSBC HOLDINGS PLC 0.01% of their portfolio | 203.8k $16.8m | Added +52.8k |
| Woodline Partners LP 0.05% of their portfolio | 200.2k $16.3m | Unchanged |
| Integral Health Asset Management, LLC 0.67% of their portfolio | 200.0k $16.3m | Reduced -100.0k |
| AQR CAPITAL MANAGEMENT LLC 0.01% of their portfolio | 198.8k $15.8m | Added +31.6k |
| JANE STREET GROUP, LLC 0.01% of their portfolio | 196.2k $16.0m | Added +180.4k |
| MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC 0.15% of their portfolio | 191.4k $15.6m | Added +7.1k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 173.3k $10.9m | Reduced -107.1k |
| WCM INVESTMENT MANAGEMENT, LLC 0.02% of their portfolio | 171.2k $13.8m | Reduced -343 |
| PINNACLE ASSOCIATES LTD 0.15% of their portfolio | 170.1k $13.9m | Reduced -5.3k |
| RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio | 169.9k $13.8m | Reduced -12.6k |
| SEB Asset Management AB 0.05% of their portfolio | 158.2k $12.9m | Unchanged |
| Clearbridge Investments, LLC 0.01% of their portfolio | 157.1k $12.8m | Reduced -45.2k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 155.9k $12.7m | Reduced -35.1k |
| Affinity Asset Advisors, LLC 0.60% of their portfolio | 150.0k $12.2m | Reduced -50.0k |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 149.2k $12.2m | Reduced -110.7k |
| WEALTH EFFECTS LLC 3.24% of their portfolio | 147.3k $12.0m | Added +4.0k |
| Retirement Systems of Alabama 0.04% of their portfolio | 145.7k $11.9m | Reduced -26.0k |
| TORONTO DOMINION BANK 0.02% of their portfolio | 144.9k $11.8m | Reduced -5.3k |
| HighTower Advisors, LLC 0.01% of their portfolio | 140.4k $11.4m | Reduced -6.1k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio | 139.8k $11.4m | Reduced -4.5k |
| Weiss Asset Management LP 0.12% of their portfolio | 134.0k $10.9m | Not comparable |
| BANK OF NOVA SCOTIA 0.02% of their portfolio | 133.8k $10.9m | Reduced -2.2k |
| PFM Health Sciences, LP 0.93% of their portfolio | 131.7k $10.7m | Added +67.4k |
| Tetragon Partners GP Ltd 1.73% of their portfolio | 130.5k $10.6m | Added +3.3k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 128.8k $10.5m | Reduced -29.6k |
| Rhenman & Partners Asset Management AB 0.98% of their portfolio | 128.0k $10.4m | Reduced -16.5k |
| VANGUARD ASSET MANAGEMENT, Ltd 0.01% of their portfolio | 119.1k $9.7m | Added +6.1k |
| Catalyst Funds Management Pty Ltd 0.54% of their portfolio | 117.6k $9.6m | New |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM 0.02% of their portfolio | 116.9k $9.5m | Reduced -7.9k |
| Universal- Beteiligungs- und Servicegesellschaft mbH 0.01% of their portfolio | 116.4k $9.5m | Reduced -3.8k |