BBC vs IBB: which is really different?
BBC and IBB hold 12% of their weight in the same names, and BBC returned +51.4% over the year. Virtus Biotech Clinical Trials ETF and iShares Biotechnology ETF.
IBB costs 0.21 points a year less; their one-year returns differ by 15.3 points; IBB is far larger, $10.8bn against $46m.
| BBC | IBB | |
|---|---|---|
| Expense ratio | 0.65% | 0.44% |
| Net assets, BBC as of Jul 31, 2026 and IBB as of Oct 9, 2026 | $46m | $10.8bn |
| Total return, 1 year | +51.4% | +36.1% |
| What it tracks | Biotech | Biotech |
| Holdings in common | 12% | |
| S&P 500, total return, 1 year | +17.3% | |
| Against the S&P 500, 1 year | ahead by 34.1 pts | ahead by 18.8 pts |
| Below its all-time high | 26.6%, high on Feb 8, 2021 | |
Holdings in common uses holdings dated Jul 31, 2026 and Oct 8, 2026.
0% of BBC's weight is in S&P 500 companies and 100% is outside the index. Holdings as of Jul 31, 2026.
40% of IBB's weight is in S&P 500 companies and 61% is outside the index. Holdings as of Oct 8, 2026.
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, BBC and IBB hold 12% 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 Jul 31, 2026 and Oct 8, 2026.
half
12% in common
12% of the two portfolios are the same securities at the same weight.
Performance, window by window
| Total return | vs the S&P 500 | vs the Nasdaq-100 | ||||
|---|---|---|---|---|---|---|
| Window | BBC | IBB | BBC | IBB | BBC | IBB |
| 3 months | −17.0% | +7.5% | −20.3 pts | +4.1 pts | −20.6 pts | +3.9 pts |
| 6 months | +1.7% | +21.9% | −13.4 pts | +6.8 pts | −21.5 pts | −1.3 pts |
| 1 year | +51.4% | +36.1% | +34.1 pts | +18.8 pts | +27.8 pts | +12.5 pts |
| 3 years | +132.7% | +69.1% | +46.9 pts | −16.7 pts | +25.4 pts | −38.2 pts |
| Since launch BBC Dec 2014 · IBB Feb 2001 | +74.9% | +525.3% | −296.4 pts | −299.7 pts | −633.5 pts | −936.3 pts |
Source: ETFIQ. Open the live comparison on ETFIQ →
On the same fields
As of Oct 9, 2026. Source: ETFIQ.
BBC in plain words
By weight, 0% of BBC's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 100%. The top ten holdings are 12% of the fund across 131 positions, as filed for Jul 31, 2026. Over the year to Oct 9, 2026 the fund returned +51.4% with distributions reinvested against +17.3% for the S&P 500, so a holder was ahead by 34.1 pts. It sits 26.6% below its all-time high of Feb 8, 2021.
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 BBC and IBB hold the same stocks?
- By their latest filings, 12% 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.
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.
ETFIQ, BBC against IBB, data as of Oct 9, 2026. https://etfiq.com/compare/themes/bbc-vs-ibb
ETFIQ. (Oct 9, 2026). BBC against IBB. Retrieved from https://etfiq.com/compare/themes/bbc-vs-ibb
[BBC against IBB (ETFIQ, Oct 9, 2026)](https://etfiq.com/compare/themes/bbc-vs-ibb)
Free to use with attribution for figures ETFIQ computes; issuer data stays under its owner's terms.