IBB vs SIL: which is really different?
IBB and SIL hold 0% of their weight in the same names, and IBB returned +36.1% over the year. iShares Biotechnology ETF and Global X Silver Miners ETF.
IBB costs 0.21 points a year less; their one-year returns differ by 12.1 points; IBB is 2.4 times larger.
| IBB | SIL | |
|---|---|---|
| Expense ratio | 0.44% | 0.65% |
| Net assets, as of Oct 8, 2026 | $10.3bn | $4.3bn |
| Total return, 1 year | +36.1% | +24.0% |
| What it tracks | Biotech | Silver miners |
| Holdings in common | 0% | |
| S&P 500, total return, 1 year | +17.3% | |
| Against the S&P 500, 1 year | ahead by 18.8 pts | ahead by 6.7 pts |
| Below its all-time high | 26.3%, high on Feb 27, 2026 | |
Holdings in common uses holdings dated Oct 8, 2026.
40% of IBB's weight is in S&P 500 companies and 61% is outside the index. Holdings as of Oct 8, 2026.
0% of SIL's weight is in S&P 500 companies and 100% 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, IBB and SIL 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
0% 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 | IBB | SIL | IBB | SIL | IBB | SIL |
| 3 months | +7.5% | +13.8% | +4.1 pts | +10.4 pts | +3.9 pts | +10.1 pts |
| 6 months | +21.9% | −10.0% | +6.8 pts | −25.2 pts | −1.3 pts | −33.2 pts |
| 1 year | +36.1% | +24.0% | +18.8 pts | +6.7 pts | +12.5 pts | +0.4 pts |
| 3 years | +69.1% | +281.8% | −16.7 pts | +196.0 pts | −38.2 pts | +174.5 pts |
| Since launch IBB Feb 2001 · SIL Apr 2010 | +525.3% | +134.2% | −299.7 pts | −628.1 pts | −936.3 pts | −1,505.1 pts |
Source: ETFIQ. Open the live comparison on ETFIQ →
On the same fields
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.
SIL in plain words
By weight, 0% of SIL'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 76% of the fund across 39 positions, as published by its issuer for Oct 8, 2026. Over the year to Oct 9, 2026 the fund returned +24.0% with distributions reinvested against +17.3% for the S&P 500, so a holder was ahead by 6.7 pts. It sits 26.3% below its all-time high of Feb 27, 2026.
Questions people ask
- Do IBB and SIL 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.
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, IBB against SIL, data as of Oct 9, 2026. https://etfiq.com/compare/themes/ibb-vs-sil
ETFIQ. (Oct 9, 2026). IBB against SIL. Retrieved from https://etfiq.com/compare/themes/ibb-vs-sil
[IBB against SIL (ETFIQ, Oct 9, 2026)](https://etfiq.com/compare/themes/ibb-vs-sil)
Free to use with attribution for figures ETFIQ computes; issuer data stays under its owner's terms.