iShares Biotechnology ETF (IBB) is an ETF managed by BlackRock / iShares. Its largest position is BLACKROCK FUNDS III (BISXX), representing 9.66% of fund assets.
iShares Biotechnology ETF Portfolio Holdings
Source: SEC Form N-PORT institutional portfolio disclosures
- Ticker:
- IBB
- Type:
- ETF
- Manager:
- BlackRock / iShares
- Total Assets:
- —
- Report Date:
- Mar 31, 2026
- Filing Date:
- May 28, 2026
| Holding | Weight | Market Value | Shares |
|---|---|---|---|
|
-
BLACKROCK FUNDS III
|
9.66% | $784,812,698.34 | 784,655,767 |
|
-
GILEAD SCIENCES, INC.
|
7.75% | $629,354,084.59 | 4,515,707 |
|
-
AMGEN INC
|
7.51% | $609,808,123.80 | 1,733,148 |
|
-
VERTEX PHARMACEUTICALS INC / MA
|
7.44% | $604,629,895.82 | 1,354,033 |
|
-
REGENERON PHARMACEUTICALS, INC.
|
7.21% | $585,840,372.48 | 758,232 |
|
-
ALNYLAM PHARMACEUTICALS, INC.
|
3.99% | $324,134,148.54 | 979,642 |
|
-
INSMED Inc
|
3.20% | $259,651,282.24 | 1,587,887 |
|
-
ARGENX SE
|
3.07% | $249,660,060.75 | 341,883 |
|
-
BIOGEN INC.
|
2.46% | $200,021,463.18 | 1,091,046 |
|
-
Natera, Inc.
|
2.41% | $196,114,593.78 | 980,622 |
|
-
UNITED THERAPEUTICS Corp
|
2.30% | $187,090,526.82 | 315,509 |
|
-
BeOne Medicines Ltd.
|
1.93% | $157,139,596.71 | 529,143 |
|
-
INCYTE CORP
|
1.70% | $138,160,912.76 | 1,467,923 |
|
-
Moderna, Inc.
|
1.68% | $136,776,917.20 | 2,692,459 |
|
-
ILLUMINA, INC.
|
1.68% | $136,484,688.66 | 1,107,291 |
|
-
Revolution Medicines, Inc.
|
1.54% | $124,860,442.00 | 1,283,912 |
|
-
Roivant Sciences Ltd.
|
1.24% | $100,898,828.90 | 3,642,557 |
|
-
NEUROCRINE BIOSCIENCES INC
|
1.18% | $95,841,113.48 | 727,502 |
|
-
GENMAB A/S
|
1.17% | $95,383,279.34 | 3,555,098 |
|
-
BridgeBio Pharma, Inc.
|
1.13% | $91,984,896.62 | 1,238,687 |
|
-
IONIS PHARMACEUTICALS INC
|
1.11% | $90,524,674.41 | 1,205,549 |
|
-
Medpace Holdings, Inc.
|
1.00% | $81,594,845.18 | 169,922 |
|
-
MADRIGAL PHARMACEUTICALS, INC.
|
1.00% | $81,316,353.27 | 155,341 |
|
-
EXELIXIS, INC.
|
0.99% | $80,261,172.14 | 1,871,326 |
|
-
BIOMARIN PHARMACEUTICAL INC
|
0.98% | $79,782,521.70 | 1,412,330 |
|
-
Ascendis Pharma A/S
|
0.96% | $77,756,306.04 | 339,948 |
|
-
Praxis Precision Medicines, Inc.
|
0.77% | $62,858,302.43 | 195,097 |
|
-
CHARLES RIVER LABORATORIES INTERNATIONAL, INC.
|
0.77% | $62,473,462.50 | 362,165 |
|
-
ARROWHEAD PHARMACEUTICALS, INC.
|
0.75% | $61,143,472.50 | 975,175 |
|
-
Vaxcyte, Inc.
|
0.75% | $60,765,336.45 | 1,045,695 |
|
-
BIO-TECHNE Corp
|
0.74% | $60,200,907.00 | 1,151,950 |
|
-
CYTOKINETICS INC
|
0.73% | $59,119,424.52 | 896,972 |
|
-
HALOZYME THERAPEUTICS, INC.
|
0.69% | $56,131,284.26 | 868,502 |
|
-
Axsome Therapeutics, Inc.
|
0.66% | $53,932,253.76 | 319,088 |
|
-
BioNTech SE
|
0.66% | $53,284,093.28 | 599,506 |
|
-
Krystal Biotech, Inc.
|
0.60% | $48,813,697.12 | 188,966 |
|
-
Protagonist Therapeutics, Inc
|
0.58% | $47,118,753.80 | 447,047 |
|
-
REPLIGEN CORP
|
0.58% | $46,762,286.72 | 396,896 |
|
-
Kymera Therapeutics, Inc.
|
0.53% | $43,426,156.65 | 521,385 |
|
-
Alkermes plc.
|
0.53% | $43,021,168.32 | 1,216,662 |
|
-
RHYTHM PHARMACEUTICALS, INC.
|
0.51% | $41,270,656.83 | 474,539 |
|
-
Abivax S.A.
|
0.50% | $40,916,782.35 | 367,461 |
|
-
PTC THERAPEUTICS, INC.
|
0.50% | $40,411,445.76 | 593,152 |
|
-
Cogent Biosciences, Inc.
|
0.48% | $38,851,652.04 | 1,009,396 |
|
-
ARCELLX INC
|
0.47% | $38,558,163.48 | 335,814 |
|
-
TERNS PHARMACEUTICALS INC
|
0.46% | $37,634,066.56 | 713,848 |
|
-
NUVALENT INC-A
|
0.45% | $36,419,028.45 | 355,481 |
|
-
Mirum Pharmaceuticals, Inc.
|
0.45% | $36,275,501.26 | 392,677 |
|
-
Tempus AI, Inc.
|
0.43% | $34,996,029.32 | 773,906 |
|
-
Xenon Pharmaceuticals Inc.
|
0.43% | $34,796,378.50 | 598,390 |
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