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IBB vs SOXX: which is really different?

IBB and SOXX hold 0% of their weight in the same names, and SOXX returned +93.4% over the year. iShares Biotechnology ETF and iShares Semiconductor ETF.

SOXX costs 0.11 points a year less; their one-year returns differ by 57.3 points; SOXX is 4.5 times larger.

IBBSOXX
Expense ratio0.44%0.33%
Net assets, as of Oct 8, 2026$10.3bn$46.6bn
Total return, 1 year+36.1%+93.4%
What it tracksBiotechSemiconductors
Holdings in common0%
S&P 500, total return, 1 year+17.3%
Against the S&P 500, 1 yearahead by 18.8 ptsahead by 76.1 pts
Below its all-time high14.5%, high on Jun 22, 2026

Holdings in common uses holdings dated Oct 8, 2026.

39.5%
IBB in the S&P 500
73.5%
SOXX in the S&P 500
+36.1%
IBB total return, 1 year
+93.4%
SOXX total return, 1 year
IBB · 1 year to Oct 9, 202661% of its weight is outside the S&P 500
61% of its weight is outside the S&P 50040% of IBB's weight is in S&P 500 companies and 61% is outside the index. Holdings as of Oct 8, 2026.40%61%of its weight in S&P 500 companiesof its weight outside the S&P 500active share 99% · top ten 50% of the fund · 245 holdings as published by its issuer for Oct 8, 2026 · Nasdaq-100: 33% in61% of its weight is outside the S&P 50040% of IBB's weight is in S&P 500 companies and 61% is outside the index. Holdings as of Oct 8, 2026.40%61%in the S&P 500outside the S&P 500active share 99% · Nasdaq-100: 33% in

40% of IBB's weight is in S&P 500 companies and 61% is outside the index. Holdings as of Oct 8, 2026.

SOXX · 1 year to Oct 9, 202627% of its weight is outside the S&P 500
27% of its weight is outside the S&P 50074% of SOXX's weight is in S&P 500 companies and 27% is outside the index. Holdings as of Oct 8, 2026.74%27%of its weight in S&P 500 companiesoutside the S&P 500active share 82% · top ten 61% of the fund · 31 holdings as published by its issuer for Oct 8, 2026 · Nasdaq-100: 66% in27% of its weight is outside the S&P 50074% of SOXX's weight is in S&P 500 companies and 27% is outside the index. Holdings as of Oct 8, 2026.74%27%in the S&P 500outsideactive share 82% · Nasdaq-100: 66% in

74% of SOXX's weight is in S&P 500 companies and 27% is outside the index. Holdings as of Oct 8, 2026.

ETFIQ Off-Index Score · IBB scores higherHow much of it is not the index it is sold as an alternative to?
0.1, the lowest in this set92.3, the highest

A percentile among the 391 thematic ETFs with a holdings filing. All thematic ETFs ranked by it → How it is computed →

What they hold in common

By the books each fund has filed, IBB and SOXX hold 0% of their money in the same securities at the same weight. Above 50%, holding both is close to holding one of them twice. Holdings dated Oct 8, 2026.

half

0% in common

Positions both hold, largest shared weight first
Holding IBB SOXX
Only in IBB
GILEAD SCIENCES 8.37%
AMGEN INC 7.89%
VERTEX PHARMACEUTICALS 7.69%
REGENERON PHARMACEUTICALS 5.40%
MODERNA 5.30%
NATERA 3.88%
ARGENX SE ADR 3.35%
ILLUMINA INC 2.94%
Only in SOXX
ADVANCED MICRO DEVICES 9.50%
INTEL CORPORATION 8.62%
MICRON TECHNOLOGY 7.78%
NVIDIA 7.52%
BROADCOM INC 7.01%
MARVELL TECHNOLOGY 4.67%
ANALOG DEVICES 4.04%
KLA 4.04%

0% of the two portfolios are the same securities at the same weight.

Performance, window by window

Total returnvs the S&P 500vs the Nasdaq-100
WindowIBBSOXXIBBSOXXIBBSOXX
3 months+7.5%−3.7%+4.1 pts−7.1 pts+3.9 pts−7.4 pts
6 months+21.9%+44.9%+6.8 pts+29.7 pts−1.3 pts+21.7 pts
1 year+36.1%+93.4%+18.8 pts+76.1 pts+12.5 pts+69.8 pts
3 years+69.1%+251.9%−16.7 pts+166.1 pts−38.2 pts+144.6 pts
Since launch
IBB Feb 2001 · SOXX Jul 2001
+525.3%+2,733.5%−299.7 pts+1,830.1 pts−936.3 pts+767.8 pts

Source: ETFIQ. Open the live comparison on ETFIQ →

On the same fields

IBB
iShares Biotechnology ETF · Holds 245 stocks in biotech, 40% of its weight in S&P 500 companies
SOXX
iShares Semiconductor ETF · Holds 31 stocks in semiconductors, 74% of its weight in S&P 500 companies
Issuer iShares iShares
Theme Biotech Semiconductors
In the S&P 500 39.5% 73.5%
Active share vs the S&P 500 99.0% 82.3%
In the Nasdaq-100 33.1% 66.0%
Holdings 245 31
Top ten, share of the fund 49.9% 61.2%
Expense ratio 0.44% 0.33%
Fee for the differing part 0.44% 0.40%
Total return, 1 year +36.1% +93.4%
vs the S&P 500 +18.8 pts +76.1 pts
vs the Nasdaq-100 +12.5 pts +69.8 pts
Below its high −4.8% −14.5%
Net assets, as of Oct 8, 2026 $10.3bn $46.6bn

As of Oct 9, 2026. Source: ETFIQ.

IBB in plain words

By weight, 40% of IBB's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 99%. The top ten holdings are 50% of the fund across 245 positions, as published by its issuer for Oct 8, 2026. Over the year to Oct 9, 2026 the fund returned +36.1% with distributions reinvested against +17.3% for the S&P 500, so a holder was ahead by 18.8 pts.

SOXX in plain words

By weight, 74% of SOXX's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 82%. The top ten holdings are 61% of the fund across 31 positions, as published by its issuer for Oct 8, 2026. Over the year to Oct 9, 2026 the fund returned +93.4% with distributions reinvested against +17.3% for the S&P 500, so a holder was ahead by 76.1 pts. It sits 14.5% below its all-time high of Jun 22, 2026.

Questions people ask

Do IBB and SOXX hold the same stocks?
By their latest filings, 0% of their books are the same securities at the same weight, which is mostly different names. Overlap is the sum of the smaller weight of every security they share.
Which is more different from the S&P 500, IBB or SOXX?
IBB has 40% of its weight in S&P 500 names and SOXX has 74%, so IBB differs more from the index.
Which is cheaper, IBB or SOXX?
IBB charges 0.44% a year and SOXX charges 0.33%, so SOXX is cheaper. Fees come from each fund's prospectus.
Other comparisons
IBB vs SMHIBB vs URAIBB vs SILIBB vs XMESOXX vs XBISOXX vs QTUMSOXX vs XARSOXX vs URA
IBB on its own →SOXX on its own →How every figure is computed →Standards and sources →
Where these figures came from
IBB and SOXX filings on SEC EDGAR ↗IBB and SOXX prospectus with the expense ratio (SEC) ↗iShares page for IBB ↗iShares page for SOXX ↗

ETFIQ links to the documents behind every figure; a link is not an endorsement. A comparison is not a recommendation.

How this is computed

It is a position in a set, not a rating, and neither end of it is a recommendation.

Weight overlap is an ETFIQ calculation: for every security both funds hold, the smaller of the two weights, summed.

Every figure is an ETFIQ calculation with distributions reinvested.

Cite this page

ETFIQ, IBB against SOXX, data as of Oct 9, 2026. https://etfiq.com/compare/themes/ibb-vs-soxx

Open data

Free to use with attribution for figures ETFIQ computes; issuer data stays under its owner's terms.