Arrowhead Pharmaceuticals, Inc.: which funds bought and sold
Institutions that bought and sold Arrowhead Pharmaceuticals shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.
Between March 31, 2026 and June 30, 2026, 269 institutions that filed 13F reports for both quarters added to or opened positions in Arrowhead Pharmaceuticals, and 214 cut or closed them. Together they sold a net 5.2M shares, −4.4% on what they held at the start of the quarter. Active managers and hedge funds on our list were net sellers of 1.2M shares (−3.1%); index fund managers were net sellers of 6.5M shares (−14.0%). 117 opened a new position and 58 sold out entirely.
Bought, Q2 2026 269 institutions, 117 of them new holders Sold, Q2 2026 214 institutions, 58 of them sold out
Net change, all compared −5.2M shares (−4.4%)
Net change, active managers −1.2M shares (−3.1%), 25 bought, 46 sold
Buyers versus sellers
269 bought 63 214 sold
Active managers and hedge funds 25 bought · 46 sold · −1.2M
Index fund managers 2 bought · 10 sold · −6.5M
Other institutions 242 bought · 158 sold · +2.5M
Biggest buyers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| First Trust Advisors LP | +1.2M +807.1% | 1.4M | $110M |
| Holocene Advisors, LP Hedge fund | +1.1M New position | 1.1M | $90.2M |
| FMR LLC Active manager | +773K +10.6% | 8.0M | $655M |
| Avoro Capital Advisors LLC Hedge fund | +656K +6.1% | 11.4M | $926M |
| Invesco Ltd. | +603K +18.4% | 3.9M | $317M |
| Dimensional Fund Advisors LP | +573K +94.2% | 1.2M | $96.3M |
| Two Sigma Investments, LP Hedge fund | +545K +1521.8% | 581K | $47.3M |
| 1832 Asset Management L.P. | +539K New position | 539K | $43.9M |
| HRT Financial LP | +499K New position | 499K | $40.6M |
| Assenagon Asset Management S.A. | +345K +587.6% | 404K | $32.9M |
| Millennium Management LLC Hedge fund | +329K New position | 329K | $26.8M |
| Artisan Partners Limited Partnership Active manager | +311K New position | 311K | $25.3M |
| Summit Partners Public Asset Management, LLC | +290K +53.7% | 830K | $67.7M |
| Balyasny Asset Management L.P. Hedge fund | +264K +128.1% | 471K | $38.4M |
| Squarepoint Ops LLC Hedge fund | +256K New position | 256K | $20.9M |
| Lord, Abbett & Co. LLC | +228K +72.8% | 540K | $44.1M |
| Susquehanna International Group, LLP | +218K +57.5% | 597K | $48.6M |
| Life Cycle Investment Partners Ltd | +209K New position | 209K | $17M |
| Envestnet Asset Management Inc | +187K +280.9% | 254K | $20.7M |
| LPL Financial LLC | +181K +140.0% | 311K | $25.3M |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Holocene Advisors, LP Hedge fund | +1.1M New position | 1.1M | $90.2M |
| FMR LLC Active manager | +773K +10.6% | 8.0M | $655M |
| Avoro Capital Advisors LLC Hedge fund | +656K +6.1% | 11.4M | $926M |
| Two Sigma Investments, LP Hedge fund | +545K +1521.8% | 581K | $47.3M |
| Millennium Management LLC Hedge fund | +329K New position | 329K | $26.8M |
| Artisan Partners Limited Partnership Active manager | +311K New position | 311K | $25.3M |
| Balyasny Asset Management L.P. Hedge fund | +264K +128.1% | 471K | $38.4M |
| Squarepoint Ops LLC Hedge fund | +256K New position | 256K | $20.9M |
| Driehaus Capital Management LLC Active manager | +160K +13.5% | 1.4M | $110M |
| Marshall Wace, LLP Hedge fund | +125K +69.9% | 305K | $24.9M |
Biggest sellers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Blackrock, Inc. Index funds | −3.3M −18.3% | 14.8M | $1.2B |
| State Street Corp Index funds | −801K −12.3% | 5.7M | $464M |
| Vanguard Portfolio Management LLC Index funds | −795K −11.1% | 6.4M | $518M |
| D. E. Shaw & Co., Inc. Hedge fund | −752K −63.5% | 432K | $35.2M |
| Geode Capital Management, LLC Index funds | −748K −17.5% | 3.5M | $299M |
| Vestal Point Capital, LP Hedge fund | −700K −30.8% | 1.6M | $128M |
| Pictet Asset Management Holding SA | −700K −55.0% | 573K | $46.7M |
| Goldman Sachs Group Inc | −590K −33.9% | 1.2M | $93.7M |
| RTW Investments, LP Hedge fund | −586K Sold out | 0 | — |
| Renaissance Technologies LLC Hedge fund | −568K −54.8% | 469K | $38.2M |
| UBS Group AG | −475K −35.5% | 862K | $70.2M |
| Northern Trust Corp Index funds | −463K −28.0% | 1.2M | $97.2M |
| Panagora Asset Management Inc Active manager | −426K −92.4% | 35K | $2.9M |
| Alyeska Investment Group, L.P. Hedge fund | −414K −87.6% | 59K | $4.8M |
| Arrowstreet Capital, Limited Partnership Hedge fund | −369K −62.8% | 218K | $17.8M |
| UBS Am, A Distinct Business Unit Of UBS Asset Management Americas LLC | −367K −27.5% | 964K | $78.6M |
| Canada Pension Plan Investment Board | −326K Sold out | 0 | — |
| American Century Companies Inc Active manager | −287K −44.1% | 364K | $29.7M |
| Charles Schwab Investment Management Inc Index funds | −268K −22.5% | 924K | $75.3M |
| Trexquant Investment LP Hedge fund | −263K −95.0% | 14K | $1.1M |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| D. E. Shaw & Co., Inc. Hedge fund | −752K −63.5% | 432K | $35.2M |
| Vestal Point Capital, LP Hedge fund | −700K −30.8% | 1.6M | $128M |
| RTW Investments, LP Hedge fund | −586K Sold out | 0 | — |
| Renaissance Technologies LLC Hedge fund | −568K −54.8% | 469K | $38.2M |
| Panagora Asset Management Inc Active manager | −426K −92.4% | 35K | $2.9M |
| Alyeska Investment Group, L.P. Hedge fund | −414K −87.6% | 59K | $4.8M |
| Arrowstreet Capital, Limited Partnership Hedge fund | −369K −62.8% | 218K | $17.8M |
| American Century Companies Inc Active manager | −287K −44.1% | 364K | $29.7M |
| Trexquant Investment LP Hedge fund | −263K −95.0% | 14K | $1.1M |
| Price T Rowe Associates Inc Active manager | −190K −18.2% | 853K | $69.6M |
New positions
| Institution | Shares | Value June 30, 2026 |
|---|---|---|
| Holocene Advisors, LPHedge fund | 1.1M | $90.2M |
| 1832 Asset Management L.P. | 539K | $43.9M |
| HRT Financial LP | 499K | $40.6M |
| Millennium Management LLCHedge fund | 329K | $26.8M |
| Artisan Partners Limited PartnershipActive manager | 311K | $25.3M |
| Squarepoint Ops LLCHedge fund | 256K | $20.9M |
| Life Cycle Investment Partners Ltd | 209K | $17M |
| Catalyst Funds Management Pty Ltd | 118K | $9.6M |
| Dorsey Wright & Associates | 97K | $7.9M |
| Jain Global LLCHedge fund | 62K | $5M |
Sold out
| Institution | Shares | Value March 31, 2026 |
|---|---|---|
| RTW Investments, LPHedge fund | 586K | $36.7M |
| Canada Pension Plan Investment Board | 326K | $20.4M |
| Longaeva Partners L.P. | 195K | $12.2M |
| Schroder Investment Management GroupActive manager | 162K | $9.3M |
| Citadel Advisors LLCHedge fund | 98K | $6.2M |
| Bridgewater Associates, LPHedge fund | 96K | $6M |
| Aquatic Capital Management LLC | 80K | $5M |
| PDT Partners, LLCHedge fund | 70K | $4.4M |
| Quadrature Capital LtdHedge fund | 56K | $3.5M |
| Ishara Investments LP | 55K | $3.5M |
Who holds the shares
- Institutions reporting
- 498
- Ten largest holders
- 56.1% of 13F-reported shares
- Index fund managers
- 33.4% of 13F-reported shares
- Active managers and hedge funds
- 32.1% of 13F-reported shares
| Type | Bought | Sold | New | Sold out | Net change in shares | Net % |
|---|---|---|---|---|---|---|
| Active managers and hedge funds | 25 | 46 | 13 | 12 | −1.2M | −3.1% |
| Index fund managers | 2 | 10 | 0 | 0 | −6.5M | −14.0% |
| Other institutions | 242 | 158 | 104 | 46 | +2.5M | +7.5% |
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