ETF · holdings as filed 2026-03-31

What's inside IBB?

iShares Biotechnology ETF

Holdings

257

positions in the fund

Top 10

55%

of fund assets

Expense ratio

—

net, per year

Fund size

$8B

total net assets

Top 15 holdings

BISXXBCF INSTITUTIONAL-SL AGNCY

9.66%

GILDGILEAD SCIENCES INC

7.75%

AMGNAMGEN INC

7.51%

VRTXVERTEX PHARMACEUTICALS INC

7.44%

REGNREGENERON PHARMACEUTICALS

7.21%

ALNYALNYLAM PHARMACEUTICALS INC

3.99%

INSMINSMED INC

3.20%

ARGXARGENX SE - ADR

3.07%

BIIBBIOGEN INC

2.46%

NTRANATERA INC

2.41%

UTHRUNITED THERAPEUTICS CORP

2.30%

ONCBEONE MEDICINES LTD-ADR

1.93%

INCYINCYTE CORP

1.70%

MRNAMODERNA INC

1.68%

ILMNILLUMINA INC

1.68%

Sectors

1Health Care

93%

2Unclassified

13%

3Industrials

4Information Technology

Geography

1United States

103%

2Bermuda

3Germany

4Unclassified

5Canada

6Ireland

7Switzerland

8Netherlands

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Data source: official SEC Form N-PORT filings (as of 2026-03-31); expense ratio from SEC prospectus (risk/return) filings. Fund holdings are disclosed quarterly and may reflect a 60-day reporting delay.
Informational and educational only — not investment advice.