Data as of .
BBC vs IDNA: which is really different?
BBC and IDNA hold 9% of their weight in the same names, and BBC returned more over the year.
ETFIQ Off-Index Score: BBC scores higher
How much of it is not the index it is sold as an alternative to?
A percentile among the 379 thematic ETFs with a holdings filing. It is a position in a set, not a rating, and neither end of it is a recommendation. All thematic ETFs ranked by it · How it is computed
9% of the two portfolios are the same securities at the same weight.
What they hold in common
By the books each fund has filed, BBC and IDNA hold 9% of their money in the same securities at the same weight.
| Holding | BBC | IDNA |
|---|---|---|
| REVOLUTION MEDICINES INC | 1.35% | 3.86% |
| VIR BIOTECHNOLOGY INC | 1.13% | 1.34% |
| ARCUS BIOSCIENCES INC | 0.88% | 1.96% |
| ABCELLERA BIOLOGICS INC | 0.85% | 2.74% |
| CORVUS PHARMACEUTICALS INC | 1.34% | 0.73% |
| JANUX THERAPEUTICS INC | 0.69% | 0.88% |
| IDEAYA BIOSCIENCES INC | 0.63% | 2.95% |
| RIGEL PHARMACEUTICALS INC | 0.52% | 0.75% |
| XENCOR INC | 0.53% | 0.51% |
| INTELLIA THERAPEUTICS INC | 1.11% | 0.48% |
| CYTOMX THERAPEUTICS INC | 0.74% | 0.45% |
| VERASTEM INC | 0.42% | 0.57% |
| Only in BBC | Only in IDNA |
|---|---|
| ERASCA INC 2.19% | MODERNA 9.74% |
| ENLIVEN THERAPEUTICS INC 1.81% | TWIST BIOSCIENCE 6.57% |
| TANGO THERAPEUTICS INC 1.71% | GENMAB 4.09% |
| ORUKA THERAPEUTICS INC 1.68% | BAYER AG 3.94% |
| SPYRE THERAPEUTICS INC 1.64% | INCYTE CORP 3.64% |
| ALUMIS INC 1.59% | REGENERON PHARMACEUTICALS 3.63% |
| DIANTHUS THERAPEUTICS INC 1.54% | TAKEDA PHARMACEUTICAL 3.63% |
| KODIAK SCIENCES INC 1.35% | IOVANCE BIOTHERAPEUTICS INC 3.57% |
Weight overlap is an ETFIQ calculation: for every security both funds hold, the smaller of the two weights, summed. Above 50%, holding both is close to holding one of them twice. Holdings dated Apr 30, 2026 and Sep 17, 2026.
Performance, window by window
| Window | Total return | vs the S&P 500 | vs the Nasdaq-100 | |||
|---|---|---|---|---|---|---|
| BBC | IDNA | BBC | IDNA | BBC | IDNA | |
| 3 months | +6.9% | +30.3% | +4.7 pts | +28.1 pts | +9.4 pts | +32.8 pts |
| 6 months | +22.7% | +41.4% | +4.7 pts | +23.4 pts | −1.5 pts | +17.2 pts |
| 1 year | +95.6% | +73.4% | +79.0 pts | +56.9 pts | +73.8 pts | +51.7 pts |
| 3 years | +143.8% | +91.3% | +65.3 pts | +12.9 pts | +45.6 pts | −6.9 pts |
| Since launch | +92.6% | +69.7% | −268.5 pts | −123.9 pts | −583.0 pts | −242.0 pts |
| BBC Virtus Biotech Clinical Trials ETF Holds 124 stocks in biotech, 0% of its weight in S&P 500 companies | IDNA iShares Genomics Immunology and Healthcare ETF Holds 62 stocks in genomics and gene editing, 24% of its weight in S&P 500 companies | |
|---|---|---|
| Issuer | Virtus | iShares |
| Theme | Biotech | Genomics and gene editing |
| In the S&P 500 | 0.0% | 23.9% |
| Active share vs the S&P 500 | 100.0% | 99.1% |
| In the Nasdaq-100 | 0.0% | 7.0% |
| Holdings | 124 | 62 |
| Top ten, share of the fund | 16.2% | 46.2% |
| Expense ratio | 0.65% | 0.47% |
| Fee for the differing part | 0.65% | 0.47% |
| Total return, 1 year | +95.6% | +73.4% |
| vs the S&P 500 | +79.0 pts | +56.9 pts |
| vs the Nasdaq-100 | +73.8 pts | +51.7 pts |
| Below its high | −19.1% | −24.7% |
| Net assets | $37m | $271m |
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 16% of the fund across 124 positions, as filed for Apr 30, 2026. Over the year to Sep 18, 2026 the fund returned +95.6% with distributions reinvested against +16.6% for the S&P 500, so a holder was ahead by 79.0 pts. It sits 19.1% below its all-time high of Feb 8, 2021.
IDNA in plain words
By weight, 24% of IDNA'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 46% of the fund across 62 positions, as published by its issuer for Sep 17, 2026. Over the year to Sep 18, 2026 the fund returned +73.4% with distributions reinvested against +16.6% for the S&P 500, so a holder was ahead by 56.9 pts. It sits 24.7% below its all-time high of Sep 2, 2021.
Questions people ask
- Do BBC and IDNA hold the same stocks?
- By their latest filings, 9% 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, BBC or IDNA?
- BBC has 0% of its weight in S&P 500 names and IDNA has 24%, so BBC differs more from the index.
- Which is cheaper, BBC or IDNA?
- BBC charges 0.65% a year and IDNA charges 0.47%, so IDNA is cheaper. Fees come from each fund's prospectus.
Other comparisons
Where these figures came from
ETFIQ links to the documents behind every figure. It is not affiliated with any issuer, and a link is not an endorsement.
Cite this page. ETFIQ, BBC against IDNA, data as of Sep 18, 2026. https://etfiq.com/compare/themes/bbc-vs-idna Free to use with attribution; the underlying files are at Open data.