Which returned more over the last year, IBB or IWF?

In the year to Sep 12, 2026, with distributions reinvested, IBB returned +41.5% and IWF returned +7.0%, so IBB returned more. One year is one year; the longer windows are in the table.

Which is cheaper, IBB or IWF?

IBB charges 0.44% a year and IWF charges 0.18%, so IWF is cheaper. Fees come from each fund's prospectus.

How much do IBB and IWF overlap with the S&P 500?

By their latest filed holdings, 36% of IBB and 94% of IWF by weight is stocks the S&P 500 already holds. Between the two funds, 1% of their books are the same securities at the same weight.

Data as of Sep 12, 2026. Both funds on the fields they both publish, from the same sources.

ETFIQetfiq.com · independent ETF data

IBB vs IWF: how they differ

IBB and IWF hold 1% of their weight in the same names, and IBB returned more over the year.

iShares Biotechnology ETF and iShares Russell 1000 Growth ETF.

What they hold in common

By the books each fund has filed, IBB and IWF hold 1% of their money in the same securities at the same weight.

Positions IBB and IWF both hold, largest shared weight first
Holding	IBB	IWF
Amgen, Inc.	7.84%	0.41%
Alnylam Pharmaceuticals, Inc.	3.12%	0.12%
Natera, Inc.	2.89%	0.11%
Revolution Medicines, Inc.	2.78%	0.11%
Insmed, Inc.	1.79%	0.07%
Neurocrine Biosciences, Inc.	1.30%	0.04%
Ionis Pharmaceuticals, Inc.	1.00%	0.04%
Medpace Holdings, Inc.	0.95%	0.04%
Bridgebio Pharma, Inc.	0.98%	0.04%
Axsome Therapeutics, Inc.	0.82%	0.03%
Madrigal Pharmaceuticals, Inc.	0.91%	0.03%
Halozyme Therapeutics, Inc.	0.72%	0.03%

Largest positions each one holds and the other does not
Only in IBB	Only in IWF
Vertex Pharmaceuticals, Inc. 8.09%	NVIDIA CORPORATION 13.85%
Gilead Sciences, Inc. 6.85%	APPLE INC. 6.72%
Regeneron Pharmaceuticals, Inc. 4.91%	ALPHABET INC. 6.18%
Argenx SE 3.76%	BROADCOM INC. 5.21%
Biogen, Inc. 2.47%	ALPHABET INC. 4.98%
Illumina, Inc. 2.07%	MICROSOFT CORPORATION 4.11%
Moderna, Inc. 1.99%	MICRON TECHNOLOGY, INC. 3.86%
BeOne Medicines Ltd. 1.77%	TESLA, INC. 3.65%

Weight overlap is an ETFIQ calculation: for every security both funds hold, the smaller of the two weights, summed. Above 50%, holding both is close to holding one of them twice. Holdings dated Jun 30, 2026.

IBB and IWF on the fields both publish, as of Sep 12, 2026. Source: ETFIQ.
	IBB iShares Biotechnology ETF	IWF iShares Russell 1000 Growth ETF
Where it sits	Core index fund	Core index fund
Issuer	iShares	iShares
What it is	Biotechnology	Russell 1000 growth
Total return, 1 year	+41.5%	+7.0%
S&P 500 over the same days	+17.5%	+17.5%
Gap to the S&P 500	+24.0 pts	−10.5 pts
Expense ratio	0.44%	0.18%
Already in the S&P 500	35.6%	93.6%
Holdings	248	368

IBB in plain words

IBB is an index equity fund tracking the Biotechnology. Over the year to Sep 11, 2026 it returned +41.5% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.44% a year. By its holdings filed for Jun 30, 2026, 36% of the fund by weight is stocks the S&P 500 also holds, across 248 positions, with the top ten at 44.8%. It sat 6.5% below its high of Aug 19, 2026 on Sep 11, 2026.

IWF in plain words

IWF is an index equity fund tracking the Russell 1000 growth. Over the year to Sep 11, 2026 it returned +7.0% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.18% a year. By its holdings filed for Jun 30, 2026, 94% of the fund by weight is stocks the S&P 500 also holds, across 368 positions, with the top ten at 54.4%. It sat 5.0% below its high of Jun 1, 2026 on Sep 11, 2026.

Questions people ask

Which returned more over the last year, IBB or IWF?: In the year to Sep 12, 2026, with distributions reinvested, IBB returned +41.5% and IWF returned +7.0%, so IBB returned more. One year is one year; the longer windows are in the table.
Which is cheaper, IBB or IWF?: IBB charges 0.44% a year and IWF charges 0.18%, so IWF is cheaper. Fees come from each fund's prospectus.
How much do IBB and IWF overlap with the S&P 500?: By their latest filed holdings, 36% of IBB and 94% of IWF by weight is stocks the S&P 500 already holds. Between the two funds, 1% of their books are the same securities at the same weight.

Other comparisons

Where to next

Where these figures came from

ETFIQ links to the documents behind every figure. It is not affiliated with any issuer, and a link is not an endorsement.

IBB against IWF, ETFIQ, data as of Sep 12, 2026. Every figure is arithmetic on a named public source; the method is at etfiq.com/methodology. A comparison is not a recommendation.

Cite this page. ETFIQ, IBB against IWF, data as of Sep 12, 2026. https://etfiq.com/compare/any/IBB-IWF Free to use with attribution; the underlying files are at Open data.

A comparison is not a recommendation. Standards and sources