GNMX vs IBB: which is really different?
GNMX and IBB hold 31% of their weight in the same names. Corgi Genomics & Precision Medicine ETF and iShares Biotechnology ETF.
GNMX costs 0.09 points a year less; IBB is far larger, $10.8bn against $1m.
| GNMX | IBB | |
|---|---|---|
| Expense ratio | 0.35% | 0.44% |
| Net assets | $1m | $10.8bn |
| Total return, 1 year | not published | +36.1% |
| What it tracks | Genomics and gene editing | Biotech |
| Holdings in common | 31% | |
| S&P 500, total return, since May 6, 2026 | +6.6% | |
| S&P 500, total return, 1 year | +17.3% | |
| Against the S&P 500, since May 6, 2026 | ahead by 39.3 pts | |
| Against the S&P 500, 1 year | ahead by 18.8 pts | |
Holdings in common uses holdings dated Oct 8, 2026 and Oct 9, 2026.
29% of GNMX's weight is in S&P 500 companies and 71% is outside the index. Holdings as of Oct 9, 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, GNMX and IBB hold 31% 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 and Oct 9, 2026.
half
31% in common
31% 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 | GNMX | IBB | GNMX | IBB | GNMX | IBB |
| 3 months | +21.0% | +7.5% | +17.6 pts | +4.1 pts | +17.4 pts | +3.9 pts |
| 6 months | not published | +21.9% | not published | +6.8 pts | not published | −1.3 pts |
| 1 year | not published | +36.1% | not published | +18.8 pts | not published | +12.5 pts |
| 3 years | not published | +69.1% | not published | −16.7 pts | not published | −38.2 pts |
| Since launch GNMX May 2026 · IBB Feb 2001 | +45.9% | +525.3% | +39.3 pts | −299.7 pts | +37.7 pts | −936.3 pts |
Source: ETFIQ. Open the live comparison on ETFIQ →
On the same fields
As of Oct 9, 2026. Source: ETFIQ.
GNMX in plain words
By weight, 29% of GNMX'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 48% of the fund across 57 positions, as published by its issuer for Oct 9, 2026. Since it first traded on May 6, 2026 the fund returned +45.9% with distributions reinvested against +6.6% for the S&P 500, so a holder was ahead by 39.3 pts.
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 GNMX and IBB hold the same stocks?
- By their latest filings, 31% of their books are the same securities at the same weight, which is a meaningful overlap. 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, GNMX against IBB, data as of Oct 9, 2026. https://etfiq.com/compare/themes/gnmx-vs-ibb
ETFIQ. (Oct 9, 2026). GNMX against IBB. Retrieved from https://etfiq.com/compare/themes/gnmx-vs-ibb
[GNMX against IBB (ETFIQ, Oct 9, 2026)](https://etfiq.com/compare/themes/gnmx-vs-ibb)
Free to use with attribution for figures ETFIQ computes; issuer data stays under its owner's terms.