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BAI vs IBB: which is really different?

BAI and IBB hold 0% of their weight in the same names. iShares A.I. Innovation and Tech Active ETF and iShares Biotechnology ETF.

IBB costs 0.11 points a year less; their one-year returns differ by 0.5 points; BAI is 1.4 times larger.

BAIIBB
Expense ratio0.55%0.44%
Net assets, as of Oct 8, 2026$14.6bn$10.3bn
Total return, 1 year+36.6%+36.1%
What it tracksArtificial intelligenceBiotech
Holdings in common0%
S&P 500, total return, 1 year+17.3%
Against the S&P 500, 1 yearahead by 19.4 ptsahead by 18.8 pts
Below its all-time high11.1%, high on Jun 22, 2026

Holdings in common uses holdings dated Oct 8, 2026.

54.1%
BAI in the S&P 500
39.5%
IBB in the S&P 500
+36.6%
BAI total return, 1 year
+36.1%
IBB total return, 1 year
BAI · 1 year to Oct 9, 202646% of its weight is outside the S&P 500
46% of its weight is outside the S&P 50054% of BAI's weight is in S&P 500 companies and 46% is outside the index. Holdings as of Oct 8, 2026.54%46%of its weight in S&P 500 companiesof its weight outside the S&P 500active share 77% · top ten 42% of the fund · 49 holdings as published by its issuer for Oct 8, 2026 · Nasdaq-100: 49% in46% of its weight is outside the S&P 50054% of BAI's weight is in S&P 500 companies and 46% is outside the index. Holdings as of Oct 8, 2026.54%46%in the S&P 500outsideactive share 77% · Nasdaq-100: 49% in

54% of BAI's weight is in S&P 500 companies and 46% is outside the index. Holdings as of Oct 8, 2026.

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.

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, BAI and IBB 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 BAI IBB
Only in BAI
MICRON TECHNOLOGY 6.27%
ADVANCED MICRO DEVICES 5.43%
NVIDIA 5.24%
TAIWAN SEMICONDUCTOR MANUFACTURING 4.64%
BROADCOM INC 4.31%
LAM RESEARCH 4.04%
SPACE EXPLORATION TECHNOLOGIES COR 3.24%
LUMENTUM HOLDINGS 2.98%
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%

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
WindowBAIIBBBAIIBBBAIIBB
3 months+1.0%+7.5%−2.4 pts+4.1 pts−2.6 pts+3.9 pts
6 months+26.9%+21.9%+11.7 pts+6.8 pts+3.7 pts−1.3 pts
1 year+36.6%+36.1%+19.4 pts+18.8 pts+13.0 pts+12.5 pts
3 yearsnot published+69.1%not published−16.7 ptsnot published−38.2 pts
Since launch
BAI Oct 2024 · IBB Feb 2001
+95.8%+525.3%+59.3 pts−299.7 pts+42.8 pts−936.3 pts

Source: ETFIQ. Open the live comparison on ETFIQ →

On the same fields

BAI
iShares A.I. Innovation and Tech Active ETF · Holds 49 stocks in artificial intelligence, 54% of its weight in S&P 500 companies
IBB
iShares Biotechnology ETF · Holds 245 stocks in biotech, 40% of its weight in S&P 500 companies
Issuer iShares iShares
Theme Artificial intelligence Biotech
In the S&P 500 54.1% 39.5%
Active share vs the S&P 500 77.2% 99.0%
In the Nasdaq-100 48.8% 33.1%
Holdings 49 245
Top ten, share of the fund 41.8% 49.9%
Expense ratio 0.55% 0.44%
Fee for the differing part 0.71% 0.44%
Total return, 1 year +36.6% +36.1%
vs the S&P 500 +19.4 pts +18.8 pts
vs the Nasdaq-100 +13.0 pts +12.5 pts
Below its high −11.1% −4.8%
Net assets, as of Oct 8, 2026 $14.6bn $10.3bn

As of Oct 9, 2026. Source: ETFIQ.

BAI in plain words

By weight, 54% of BAI's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 77%. The top ten holdings are 42% of the fund across 49 positions, as published by its issuer for Oct 8, 2026. Over the year to Oct 9, 2026 the fund returned +36.6% with distributions reinvested against +17.3% for the S&P 500, so a holder was ahead by 19.4 pts. It sits 11.1% below its all-time high of Jun 22, 2026.

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.

Questions people ask

Do BAI and IBB 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, BAI or IBB?
BAI has 54% of its weight in S&P 500 names and IBB has 40%, so IBB differs more from the index.
Which is cheaper, BAI or IBB?
BAI charges 0.55% a year and IBB charges 0.44%, so IBB is cheaper. Fees come from each fund's prospectus.
Other comparisons
BAI vs XBIBAI vs AIHYBAI vs IGFBAI vs AIRRIBB vs AIQIBB vs ARTYIBB vs IGVIBB vs PAVE
BAI on its own →IBB on its own →How every figure is computed →Standards and sources →
Where these figures came from
BAI filings on SEC EDGAR ↗BAI prospectus with the expense ratio (SEC) ↗iShares page for BAI ↗IBB filings on SEC EDGAR ↗IBB prospectus with the expense ratio (SEC) ↗iShares page for IBB ↗

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

Open data

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