Arrowhead Pharmaceuticals, Inc. (ARWR): Ownership & Insider Activity
Hedge funds and institutional managers reporting a position in ARWR · Health Care. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.
Reported Holders
24
13F filers
Aggregate Value
$915.1M
Across holders
Last Price
$86.73
2026-08-24
Sector
Health Care
GICS
Quarterly fund activity12 increased10 reduced3 exited
| Manager⇅ | Type⇅ | Shares⇅ | Market Value▼ | % of Total⇅ | % of Portfolio⇅ | Action⇅ | QoQ Change⇅ | Quarter⇅ |
|---|---|---|---|---|---|---|---|---|
| FRED ALGER MANAGEMENT, LLC CIK 0000003520 | Hedge Fund | 3.30M | $269.1M | 29.4% | 0.9% | Reduced | $-3.3M | Q2 2026 |
| BAKER BROS. ADVISORS LP CIK 0001263508 | Hedge Fund | 1.99M | $162.4M | 17.7% | 0.8% | Unchanged | +$0 | Q2 2026 |
| Holocene Advisors, LP CIK 0001700574 | Hedge Fund | 1.11M | $90.2M | 9.9% | 0.2% | Added | — | Q2 2026 |
| Fisher Asset Management, LLC CIK 0000850529 | Institutional Manager | 958K | $78.1M | 8.5% | 0.0% | Reduced | $-12.7M | Q2 2026 |
| TWO SIGMA INVESTMENTS, LP CIK 0001179392 | Hedge Fund | 581K | $47.3M | 5.2% | 0.0% | Added | +$47.0M | Q2 2026 |
| BALYASNY ASSET MANAGEMENT LLC CIK 0001218710 | Hedge Fund | 471K | $38.4M | 4.2% | 0.0% | Added | +$4.7M | Q2 2026 |
| RENAISSANCE TECHNOLOGIES LLC CIK 0001037389 | Hedge Fund | 469K | $38.2M | 4.2% | 0.1% | Reduced | $-46.3M | Q2 2026 |
| SHAW D E & CO INC CIK 0001009207 | Hedge Fund | 432K | $35.2M | 3.8% | 0.0% | Reduced | $-139.9M | Q2 2026 |
| MILLENNIUM MANAGEMENT LLC CIK 0001273087 | Hedge Fund | 329K | $26.8M | 2.9% | 0.0% | Added | — | Q2 2026 |
| MARSHALL WACE, LLP CIK 0001318757 | Hedge Fund | 305K | $24.9M | 2.7% | 0.0% | Added | +$411K | Q2 2026 |
Reduced
Hedge Fund
$269.1M· 29.4% of total· 0.9% port· 3.30M sh· $-3.3M QoQ· Q2 2026
Unchanged
Hedge Fund
$162.4M· 17.7% of total· 0.8% port· 1.99M sh· +$0 QoQ· Q2 2026
Added
Hedge Fund
$90.2M· 9.9% of total· 0.2% port· 1.11M sh· — QoQ· Q2 2026
Reduced
Institutional Manager
$78.1M· 8.5% of total· 0.0% port· 958K sh· $-12.7M QoQ· Q2 2026
Added
Hedge Fund
$47.3M· 5.2% of total· 0.0% port· 581K sh· +$47.0M QoQ· Q2 2026
Added
Hedge Fund
$38.4M· 4.2% of total· 0.0% port· 471K sh· +$4.7M QoQ· Q2 2026
Reduced
Hedge Fund
$38.2M· 4.2% of total· 0.1% port· 469K sh· $-46.3M QoQ· Q2 2026
Reduced
Hedge Fund
$35.2M· 3.8% of total· 0.0% port· 432K sh· $-139.9M QoQ· Q2 2026
Added
Hedge Fund
$26.8M· 2.9% of total· 0.0% port· 329K sh· — QoQ· Q2 2026
Added
Hedge Fund
$24.9M· 2.7% of total· 0.0% port· 305K sh· +$411K QoQ· Q2 2026
Added
Hedge Fund
$20.9M· 2.3% of total· 0.0% port· 256K sh· — QoQ· Q2 2026
Reduced
Hedge Fund
$17.8M· 1.9% of total· 0.0% port· 218K sh· $-30.1M QoQ· Q2 2026
Unchanged
Hedge Fund
$16.3M· 1.8% of total· 0.1% port· 200K sh· +$0 QoQ· Q2 2026
Added
Hedge Fund
$15.8M· 1.7% of total· 0.0% port· 199K sh· +$15.5M QoQ· Q2 2026
Reduced
Hedge Fund
$12.8M· 1.4% of total· 0.0% port· 157K sh· $-3.7M QoQ· Q2 2026
Added
Hedge Fund
$10.6M· 1.2% of total· 1.7% port· 130K sh· +$268K QoQ· Q2 2026
Added
Hedge Fund
$4.8M· 0.5% of total· 0.0% port· 59K sh· — QoQ· Q2 2026
Reduced
Hedge Fund
$2.1M· 0.2% of total· 0.0% port· 26K sh· +$1.8M QoQ· Q2 2026
Added
Hedge Fund
$1.1M· 0.1% of total· 0.0% port· 13K sh· — QoQ· Q2 2026
Reduced
Hedge Fund
$749K· 0.1% of total· 0.0% port· 9K sh· $-66K QoQ· Q2 2026
Reduced
Hedge Fund
$611K· 0.1% of total· 0.0% port· 8K sh· $-1.8M QoQ· Q2 2026
Reduced
Hedge Fund
$546K· 0.1% of total· 0.0% port· 7K sh· $-2.6M QoQ· Q2 2026
Added
Hedge Fund
$432K· 0.0% of total· 0.0% port· 5K sh· +$287K QoQ· Q2 2026
Added
Hedge Fund
$10K· 0.0% of total· 0.0% port· 128 sh· — QoQ· Q2 2026
1–10 of 24
1 / 3
Loading recent insider activity…