{"url":"https://etfiq.com/compare/themes/arkk-vs-ibb","section":"compare","title":"ARKK vs IBB: which is really different? | ETFIQ","description":"ARKK and IBB hold 6% of their weight in the same names, and IBB returned +36.1% over the year. Returns and overlap to Oct 9, 2026.","as_of":"Oct 9, 2026","structured_data":[{"@type":"FAQPage","mainEntity":[{"@type":"Question","name":"Do ARKK and IBB hold the same stocks?","acceptedAnswer":{"@type":"Answer","text":"By their latest filings, 6% 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."}},{"@type":"Question","name":"Which is more different from the S&P 500, ARKK or IBB?","acceptedAnswer":{"@type":"Answer","text":"ARKK has 36% of its weight in S&P 500 names and IBB has 40%, so IBB differs more from the index."}},{"@type":"Question","name":"Which is cheaper, ARKK or IBB?","acceptedAnswer":{"@type":"Answer","text":"ARKK charges 0.75% a year and IBB charges 0.44%, so IBB 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":"ARKK vs IBB","item":"https://etfiq.com/compare/themes/arkk-vs-ibb"}]},{"@type":"WebPage","name":"ARKK vs IBB: which is really different?","description":"ARKK and IBB hold 6% of their weight in the same names, and IBB returned +36.1% over the year. Returns and overlap to Oct 9, 2026.","url":"https://etfiq.com/compare/themes/arkk-vs-ibb","dateModified":"2026-10-09","abstract":"ARKK and IBB hold 6% of their weight in the same names, and IBB returned +36.1% over the year.","publisher":{"@id":"https://etfiq.com/#org"},"isPartOf":{"@id":"https://etfiq.com/#website"},"speakable":{"@type":"SpeakableSpecification","cssSelector":[".verdict",".faq"]}},{"@type":"Dataset","name":"ETFIQ comparison of ARKK and IBB","description":"ARKK and IBB hold 6% of their weight in the same names, and IBB returned +36.1% over the year. Returns and overlap to Oct 9, 2026.","dateModified":"2026-10-09","creator":{"@id":"https://etfiq.com/#org"},"isAccessibleForFree":true,"url":"https://etfiq.com/compare/themes/arkk-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":7491,"truncated":true,"content":"ETFIQ / Thematic ETFs / Head to head / ARKK vs IBB \n ETFIQ etfiq.com \u00b7 independent ETF data \n\n Data as of Oct 9, 2026 .\n\n ARKK vs IBB: which is really different?\n\n ARKK and IBB hold 6% of their weight in the same names, and IBB returned +36.1% over the year.\n Copy this for sharing \n \n IBB costs 0.31 points a year less; their one-year returns differ by 38.3 points; IBB is 1.5 times larger.\n ARKK and IBB at a glance. As of Oct 9, 2026. Source: ETFIQ. ARKK IBB \n Expense ratio 0.75% 0.44% \n Net assets, as of Oct 8, 2026 $6.9bn $10.3bn \n Total return, 1 year \u22122.2% +36.1% \n What it tracks Broad inno","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, ARKK against IBB, data as of Oct 9, 2026. https://etfiq.com/compare/themes/arkk-vs-ibb","a":{"ticker":"ARKK","name":"ARK Innovation ETF","issuer":"ARK","desk":"themes","as_of":"2026-10-09","verdict":"ARKK holds 46 stocks, and 64% of its weight is outside the S&P 500.","url":"https://etfiq.com/funds/arkk","key_facts":[{"label":"Already in the S&P 500","value":"36.0%","as_of":"2026-10-09","source":null},{"label":"Active share vs the S&P 500","value":"85.0%","as_of":"2026-10-09","source":null},{"label":"Top ten holdings","value":"47.4%","as_of":"2026-10-09","source":null},{"label":"Total return, 1 year","value":"\u22122.2%","as_of":"2026-10-09","source":null},{"label":"Net assets","value":"$6.9bn","as_of":"2026-10-09","source":"the issuer\u2019s daily holdings, added up, as of Oct 8, 2026"},{"label":"Expense ratio","value":"0.75%","as_of":"2026-10-09","source":"485BPOS XBRL, Nov 26, 2025"}]},"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":"$10.3bn","as_of":"2026-10-09","source":"the issuer\u2019s own daily fund list, as of Oct 8, 2026"},{"label":"Expense ratio","value":"0.44%","as_of":"2026-10-09","source":"485BPOS XBRL, Jul 27, 2026"}]},"overlap_pct":6,"full_text_at":"https://etfiq.com/compare/themes/arkk-vs-ibb"}