Data as of Oct 28, 2026.
IBB vs RSP: Differences, Returns & Fees
Over the year to Oct 28, 2026, IBB returned +37.5% to RSP's +16.0%, and RSP charges 0.20% to IBB's 0.44%.
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Net assets on Oct 27, 2026: $11.0bn for iShares Biotechnology ETF and $99.8bn for Invesco S&P 500 Equal Weight ETF.
Pair scorecard
RSP costs 0.24 points a year less; their one-year returns differ by 21.5 points; RSP is 9.1 times larger.
| Measure | IBB | RSP |
|---|---|---|
| Return | ||
| Total return, 1 year | +37.5% | +16.0% |
| Benchmark | ||
| What it tracks | Biotech | S&P 500 Equal Weight Index |
| Cost and size | ||
| Expense ratio | 0.44% | 0.20% |
| Net assets, as of Oct 27, 2026 | $11.0bn | $99.8bn |
| Active share vs the S&P 500 | 99% | |
| Holdings | ||
| Holdings in common | 2% | |
| Top ten holdings, share of the fund | 50% | 2.7% |
Holdings in common uses holdings dated Oct 27, 2026. Method
What they share
By the books each fund has filed, IBB and RSP hold 2% of their money in the same securities at the same weight. Holdings dated Oct 27, 2026.
half
2% in common
Only in one fund ↓
Side by side
IBB and RSP on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.
IBB
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 27, 2026. Over the year to Oct 28, 2026 the fund returned +37.5% with distributions reinvested.
RSP
RSP tracks the S&P 500 equal weight. Over the year to Oct 28, 2026 it returned +16.0% with distributions reinvested, against +13.7% for its benchmark, the S&P 500 Index. The prospectus expense ratio is 0.20% a year. By its holdings published by its issuer for Oct 27, 2026, 100% of the fund by weight is stocks the S&P 500 also holds, across 508 positions, with the top ten at 2.7%.
Questions people ask
- Are IBB and RSP in the same category?
- IBB is a thematic ETF and RSP is a stock ETF, so they do different jobs. The table compares what both publish: return, cost and holdings.
- Which returned more over the last year, IBB or RSP?
- In the year to Oct 28, 2026, with distributions reinvested, IBB returned +37.5% and RSP +16.0%.
- Which is cheaper, IBB or RSP?
- RSP is cheaper, by 0.24 percentage points a year. That is about $24 on $10,000 held for a year. Fees come from each fund's prospectus.
Links are sources, not endorsements. A comparison is not a recommendation.
How this is computed
Overlap adds up the smaller of the two weights for each security both funds hold.
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ETFIQ, IBB against RSP, data as of Oct 28, 2026. https://etfiq.com/compare/any/ibb-vs-rsp
ETFIQ. (Oct 28, 2026). IBB against RSP. Retrieved from https://etfiq.com/compare/any/ibb-vs-rsp
[IBB against RSP (ETFIQ, Oct 28, 2026)](https://etfiq.com/compare/any/ibb-vs-rsp)
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