IBB holdings
What iShares Biotech (IBB) holds: its top holdings by weight and its sector weights.
IBB top holdings
| Holding | Weight |
|---|---|
| GILD Gilead | 8.94% |
| AMGN Amgen | 8.31% |
| VRTX Vertex | 7.87% |
| REGN Regeneron | 6.24% |
| MRNA Moderna | 5.49% |
| NTRA Natera | 3.78% |
| ARGX argenx | 3.36% |
| BIIB Biogen | 2.52% |
| RVMD Revolution Medicines | 2.50% |
| ILMN Illumina | 2.41% |
| GMAB Genmab | 2.14% |
| ONC BeOne Medicines | 2.11% |
| UTHR United Therapeutics | 1.68% |
| INSM Insmed | 1.64% |
| INCY Incyte | 1.64% |
| ALNY Alnylam | 1.49% |
| ROIV Roivant Sciences | 1.31% |
| CRL Charles River | 1.15% |
| EXEL Exelixis | 1.13% |
| ASND Ascendis Pharma | 1.05% |
| HALO Halozyme | 1.00% |
| NBIX Neurocrine Biosciences | 1.00% |
| MEDP Medpace | 0.99% |
| BBIO BridgeBio Pharma | 0.89% |
| TECH Bio-Techne | 0.77% |
| BMRN BioMarin | 0.76% |
| RGEN Repligen | 0.72% |
| TWST Twist Bioscience | 0.66% |
| KYMR Kymera Therapeutics | 0.64% |
| MDGL Madrigal Pharma | 0.63% |
| PCVX Vaxcyte | 0.61% |
| PTGX Protagonist Therapeutics | 0.60% |
| KRYS Krystal Biotech | 0.58% |
| BNTX BioNTech | 0.57% |
| CYTK Cytokinetics | 0.57% |
| TXG 10x Genomics | 0.55% |
| ARWR Arrowhead | 0.54% |
| TEM Tempus AI | 0.53% |
| SYRE Spyre Therapeutics | 0.52% |
| PRAX PRAXIS PRECISION MEDICINES | 0.51% |
| ALKS Alkermes | 0.50% |
| IONS Ionis Pharmaceuticals | 0.48% |
| AXSM Axsome Therapeutics | 0.43% |
| BRKR Bruker | 0.43% |
| ABVX Abivax | 0.43% |
| RYTM Rhythm Pharmaceuticals | 0.41% |
| GRAL GRAIL | 0.41% |
| KOD Kodiak Sciences | 0.39% |
| ORKA Oruka Therapeutics | 0.39% |
| COGT Cogent Biosciences | 0.33% |
IBB sector weights
| Sector | Weight |
|---|---|
| Biotechnology | 87.45% |
| Life Sciences Tools & Services | 9.55% |
| Pharmaceuticals | 2.66% |
| Health Care Services | 0.14% |
| Cash and/or Derivatives | 0.10% |
| Health Care Equipment | 0.10% |
- IBB's biggest holdings: GILD 8.94%, AMGN 8.31%, VRTX 7.87%, REGN 6.24%, MRNA 5.49%.
Updated 2026-11-02 20:40 UTC