{"url":"https://etfiq.com/compare/themes/gnmx-vs-ibb","section":"compare","title":"GNMX vs IBB: which is really different? | ETFIQ","description":"28.7% of GNMX and 39.5% of IBB is already in the S&P 500 by weight, as filed, and 31% of the two books are the same names at the same weight.","as_of":"Oct 9, 2026","structured_data":[{"@type":"FAQPage","mainEntity":[{"@type":"Question","name":"Do GNMX and IBB hold the same stocks?","acceptedAnswer":{"@type":"Answer","text":"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."}},{"@type":"Question","name":"Which is more different from the S&P 500, GNMX or IBB?","acceptedAnswer":{"@type":"Answer","text":"GNMX has 29% of its weight in S&P 500 names and IBB has 40%, so GNMX differs more from the index."}},{"@type":"Question","name":"Which is cheaper, GNMX or IBB?","acceptedAnswer":{"@type":"Answer","text":"GNMX charges 0.35% a year and IBB charges 0.44%, so GNMX is cheaper. Fees come from each fund's prospectus."}}]},{"@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"ETFIQ","item":"https://etfiq.com/"},{"@type":"ListItem","position":2,"name":"Thematic ETFs","item":"https://etfiq.com/themes/"},{"@type":"ListItem","position":3,"name":"GNMX vs IBB","item":"https://etfiq.com/compare/themes/gnmx-vs-ibb"}]},{"@type":"WebPage","name":"GNMX vs IBB: which is really different?","description":"28.7% of GNMX and 39.5% of IBB is already in the S&P 500 by weight, as filed, and 31% of the two books are the same names at the same weight.","url":"https://etfiq.com/compare/themes/gnmx-vs-ibb","dateModified":"2026-10-10","abstract":"GNMX and IBB hold 31% of their weight in the same names.","publisher":{"@id":"https://etfiq.com/#org"},"isPartOf":{"@id":"https://etfiq.com/#website"},"speakable":{"@type":"SpeakableSpecification","cssSelector":[".verdict",".faq"]}},{"@type":"Dataset","name":"ETFIQ comparison of GNMX and IBB","description":"28.7% of GNMX and 39.5% of IBB is already in the S&P 500 by weight, as filed, and 31% of the two books are the same names at the same weight.","dateModified":"2026-10-10","creator":{"@id":"https://etfiq.com/#org"},"isAccessibleForFree":true,"url":"https://etfiq.com/compare/themes/gnmx-vs-ibb","license":"https://etfiq.com/license/","publisher":{"@id":"https://etfiq.com/#org"},"inLanguage":"en","creativeWorkStatus":"Published","distribution":[{"@type":"DataDownload","encodingFormat":"application/json","contentUrl":"https://etfiq.com/data/thematic.json"}],"variableMeasured":["Weight overlap with the S&P 500","Active share","Holdings","Top ten share of the fund","Total return","Fee for the differing part","Expense ratio"],"keywords":["exchange-traded funds","ETF","Thematic ETFs","fund data","SEC filings"]}],"characters":7472,"truncated":true,"content":"ETFIQ / Thematic ETFs / Head to head / GNMX vs IBB \n ETFIQ etfiq.com \u00b7 independent ETF data \n\n Data as of Oct 9, 2026 .\n\n GNMX vs IBB: which is really different?\n\n GNMX and IBB hold 31% of their weight in the same names.\n Copy this for sharing \n \n GNMX costs 0.09 points a year less; IBB is far larger, $10.8bn against $1m.\n GNMX and IBB at a glance. As of Oct 9, 2026. Source: ETFIQ. GNMX IBB \n Expense ratio 0.35% 0.44% \n Net assets $1m $10.8bn \n Total return, 1 year not published +36.1% \n What it tracks Genomics and gene editing Biotech \n Holdings in common 31% \n Holdings in common uses holding","source":"ETFIQ, independent ETF data. Recomputed nightly from public filings and prices.","publisher":{"@id":"https://etfiq.com/#org","name":"ETFIQ","url":"https://etfiq.com"},"license":"https://etfiq.com/license/","license_text":"Figures ETFIQ computes are free to use with attribution: ETFIQ (etfiq.com). Issuer data stays under its owner's terms.","citation":"ETFIQ, GNMX against IBB, data as of Oct 9, 2026. https://etfiq.com/compare/themes/gnmx-vs-ibb","a":{"ticker":"GNMX","name":"Corgi Genomics & Precision Medicine ETF","issuer":"Corgi","desk":"themes","as_of":"2026-10-09","verdict":"GNMX holds 57 stocks, and 71% of its weight is outside the S&P 500.","url":"https://etfiq.com/funds/gnmx","key_facts":[{"label":"Already in the S&P 500","value":"28.7%","as_of":"2026-10-09","source":null},{"label":"Active share vs the S&P 500","value":"99.4%","as_of":"2026-10-09","source":null},{"label":"Top ten holdings","value":"47.9%","as_of":"2026-10-09","source":null},{"label":"Total return, since launch","value":"+45.9%","as_of":"2026-10-09","source":null},{"label":"Net assets","value":"$1m","as_of":"2026-10-09","source":"the issuer\u2019s own daily fund list, as of Oct 9, 2026"},{"label":"Expense ratio","value":"0.35%","as_of":"2026-10-09","source":"485BPOS XBRL, Apr 30, 2026"}]},"b":{"ticker":"IBB","name":"iShares Biotechnology ETF","issuer":"iShares","desk":"themes","as_of":"2026-10-09","verdict":"IBB holds 245 stocks, and 60% of its weight is outside the S&P 500.","url":"https://etfiq.com/funds/ibb","key_facts":[{"label":"Already in the S&P 500","value":"39.5%","as_of":"2026-10-09","source":null},{"label":"Active share vs the S&P 500","value":"99.0%","as_of":"2026-10-09","source":null},{"label":"Top ten holdings","value":"49.9%","as_of":"2026-10-09","source":null},{"label":"Total return, 1 year","value":"+36.1%","as_of":"2026-10-09","source":null},{"label":"Net assets","value":"$10.8bn","as_of":"2026-10-09","source":"the issuer\u2019s own daily fund list, as of Oct 9, 2026"},{"label":"Expense ratio","value":"0.44%","as_of":"2026-10-09","source":"485BPOS XBRL, Jul 27, 2026"}]},"overlap_pct":31,"full_text_at":"https://etfiq.com/compare/themes/gnmx-vs-ibb"}