Total Holdings
248
As of Oct 4, 2026
iShares Biotechnology ETF
IBBNASDAQBlackRockEquity
$207.41Today:- (-)1Y +35.19%
As of Oct 15, 2026 close
- Assets (AUM)
- $10.64B
- Expense ratio
- 0.44%
- Dividend yield
- 0.16%
- Holdings
- 248
- 52-week range
- $151.01$217.12
- Volume (live)
- -
- Avg. volume (3M)
- 1.64M
IBB ETF Holdings: iShares Biotechnology ETF
Every listed position with its portfolio weight, plus sector breakdown and geographic exposure for this Equity ETF. Analyze fund diversification and concentration.
Top 10 Holdings
49.9%
Share of fund assets
Assets (AUM)
$10.64B
Total fund assets
Expense Ratio
0.44%
Annual management fee
Portfolio Allocations
Distribution breakdown by sector, asset type, and geographic region. Understand the fund's diversification strategy across markets and asset classes.
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Top 50 of 248 IBB Holdings by Portfolio Weight
Holdings as of Oct 4, 2026. Ticker, name, asset type and portfolio weight for each position. Fund disclosures available to us list the largest 50 positions.
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| # | Symbol | Name | Type | Weight |
|---|---|---|---|---|
| 1 |  | Gilead Sciences, Inc | Stock | 8.26% |
| 2 |  | Amgen Inc. | Stock | 7.63% |
| 3 |  | Vertex Pharmaceuticals Incorporated | Stock | 7.54% |
| 4 |  | Regeneron Pharmaceuticals, Inc | Stock | 5.58% |
| 5 |  | Moderna, Inc. | Stock | 5.00% |
| 6 |  | Natera, Inc. | Stock | 3.98% |
| 7 |  | argenx NV ADR | Stock | 3.75% |
| 8 |  | Illumina, Inc. | Stock | 2.96% |
| 9 |  | Revolution Medicines, Inc. | Stock | 2.87% |
| 10 |  | Alnylam Pharmaceuticals, Inc | Stock | 2.35% |
| 11 |  | Biogen Inc. | Stock | 2.32% |
| 12 |  | BeOne Medicines AG | Stock | 2.17% |
| 13 |  | Insmed Incorporated | Stock | 1.82% |
| 14 |  | Incyte Corporation | Stock | 1.79% |
| 15 |  | United Therapeutics Corporation | Stock | 1.62% |
| 16 |  | Roivant Sciences Ltd | Stock | 1.40% |
| 17 |  | Genmab A/S | Stock | 1.39% |
| 18 |  | Neurocrine Biosciences, Inc. | Stock | 1.04% |
| 19 |  | Ascendis Pharma AS | Stock | 1.03% |
| 20 |  | Exelixis, Inc. | Stock | 1.01% |
| 21 |  | Medpace Holdings, Inc | Stock | 0.99% |
| 22 |  | Charles River Laboratories International, Inc. | Stock | 0.99% |
| 23 |  | Halozyme Therapeutics, Inc | Stock | 0.91% |
| 24 |  | Twist Bioscience Corporation | Stock | 0.87% |
| 25 |  | BridgeBio Pharma, Inc. | Stock | 0.85% |
| 26 |  | BioMarin Pharmaceutical Inc | Stock | 0.85% |
| 27 |  | Bio-Techne Corporation | Stock | 0.79% |
| 28 |  | Madrigal Pharmaceuticals, Inc | Stock | 0.78% |
| 29 |  | Repligen Corporation | Stock | 0.70% |
| 30 |  | BioNTech SE | Stock | 0.68% |
| 31 |  | Arrowhead Pharmaceuticals, Inc | Stock | 0.67% |
| 32 |  | 10x Genomics, Inc | Stock | 0.66% |
| 33 |  | Kymera Therapeutics, Inc | Stock | 0.64% |
| 34 |  | Krystal Biotech, Inc | Stock | 0.64% |
| 35 |  | Cytokinetics, Incorporated | Stock | 0.63% |
| 36 |  | Axsome Therapeutics, Inc | Stock | 0.63% |
| 37 |  | Protagonist Therapeutics Inc | Stock | 0.62% |
| 38 |  | Vaxcyte, Inc | Stock | 0.60% |
| 39 |  | Tempus AI, Inc. Class A Common Stock | Stock | 0.58% |
| 40 |  | Praxis Precision Medicines, Inc | Stock | 0.55% |
| 41 |  | Ionis Pharmaceuticals, Inc | Stock | 0.52% |
| 42 |  | Spyre Therapeutics Inc. | Stock | 0.51% |
| 43 |  | Abivax SA American Depositary Shares | Stock | 0.50% |
| 44 |  | Alkermes plc | Stock | 0.49% |
| 45 |  | Bruker Corporation | Stock | 0.48% |
| 46 |  | Rhythm Pharmaceuticals, Inc | Stock | 0.46% |
| 47 |  | Oruka Therapeutics, Inc. | Stock | 0.39% |
| 48 |  | Travere Therapeutics Inc | Stock | 0.39% |
| 49 |  | CRISPR Therapeutics AG | Stock | 0.37% |
| 50 |  | PTC Therapeutics, Inc | Stock | 0.37% |
Source: Fund holdings disclosures. Data as of Oct 4, 2026. Data sources and methodology
Frequently Asked Questions About iShares Biotechnology ETF Holdings
What are the top holdings in IBB?
As of Oct 4, 2026, iShares Biotechnology ETF (IBB) holds 248 securities. The largest are Gilead Sciences, Inc (8.26%), Amgen Inc. (7.63%), Vertex Pharmaceuticals Incorporated (7.54%). The holdings table lists each position by portfolio weight with its ticker, name and asset type.
How concentrated is IBB's portfolio?
As of Oct 4, 2026, the 10 largest positions make up 49.9% of IBB's assets. A concentrated portfolio has fewer large positions with higher individual weights, while a diversified portfolio distributes holdings more evenly.
What is IBB's sector allocation?
The Sector Allocation chart shows how IBB distributes investments across different industries like Technology, Healthcare, Financials, and more. This sector exposure helps understand the fund's industry diversification strategy.
What countries does IBB invest in?
IBB's geographic exposure is shown in the Countries tab under Portfolio Allocations. This reveals the fund's international diversification and exposure to different regions and global markets.
How diversified is IBB ETF?
IBB's diversification can be assessed by reviewing its 248 holdings (as of Oct 4, 2026), sector allocation, and geographic exposure. A well-diversified ETF spreads investments across multiple securities, sectors, and regions to reduce concentration risk.