{"url":"https://etfiq.com/compare/themes/mars-vs-nasa","section":"compare","title":"MARS vs NASA: which is really different? | ETFIQ","description":"0.0% of MARS and 2.6% of NASA is already in the S&P 500 by weight, as filed, and 51% of the two books are the same names at the same weight.","as_of":"Sep 30, 2026","structured_data":[{"@type":"FAQPage","mainEntity":[{"@type":"Question","name":"Do MARS and NASA hold the same stocks?","acceptedAnswer":{"@type":"Answer","text":"By their latest filings, 51% of their books are the same securities at the same weight, which is close to holding one of them twice. 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, MARS or NASA?","acceptedAnswer":{"@type":"Answer","text":"MARS has 0% of its weight in S&P 500 names and NASA has 3%, so MARS differs more from the index."}},{"@type":"Question","name":"Which is cheaper, MARS or NASA?","acceptedAnswer":{"@type":"Answer","text":"MARS charges 0.75% a year and NASA charges 0.75%, so MARS 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":"MARS vs NASA","item":"https://etfiq.com/compare/themes/mars-vs-nasa"}]},{"@type":"WebPage","name":"MARS vs NASA: which is really different?","description":"0.0% of MARS and 2.6% of NASA is already in the S&P 500 by weight, as filed, and 51% of the two books are the same names at the same weight. Returns and overlap to Sep 30, 2026.","url":"https://etfiq.com/compare/themes/mars-vs-nasa","dateModified":"2026-09-30","abstract":"MARS and NASA hold 51% 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 MARS and NASA","description":"0.0% of MARS and 2.6% of NASA is already in the S&P 500 by weight, as filed, and 51% of the two books are the same names at the same weight. Returns and overlap to Sep 30, 2026.","dateModified":"2026-09-30","creator":{"@id":"https://etfiq.com/#org"},"isAccessibleForFree":true,"url":"https://etfiq.com/compare/themes/mars-vs-nasa","license":"https://etfiq.com/standards/","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":6920,"truncated":true,"content":"ETFIQ / Thematic ETFs / Head to head / MARS vs NASA \n ETFIQ etfiq.com \u00b7 independent ETF data \n\n Data as of Sep 30, 2026 .\n\n MARS vs NASA: which is really different?\n\n MARS and NASA hold 51% of their weight in the same names.\n Copy this for sharing \n \n Roundhill Space & Technology ETF and Tema Space Innovators ETF.\n\n Download as PDF \n\n 0.0% MARS in the S&P 500 \n 2.6% NASA in the S&P 500 \n +1.4% MARS total return, since launch \n \u22124.8% NASA total return, since launch \n\n ETFIQ Off-Index Score: MARS scores higher\n How much of it is not the index it is sold as an alternative to?\n [MARS scores 92 and","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/","citation":"ETFIQ, as of Sep 30, 2026. https://etfiq.com/compare/themes/mars-vs-nasa","a":{"ticker":"MARS","name":"Roundhill Space & Technology ETF","issuer":"Roundhill","desk":"themes","as_of":"2026-09-30","verdict":"MARS holds 29 stocks, and 100% of its weight is outside the S&P 500.","url":"https://etfiq.com/funds/mars","key_facts":[{"label":"Already in the S&P 500","value":"0.0%","as_of":"2026-09-30","source":null},{"label":"Active share vs the S&P 500","value":"100.0%","as_of":"2026-09-30","source":null},{"label":"Top ten holdings","value":"67.9%","as_of":"2026-09-30","source":null},{"label":"Total return, since launch","value":"+1.4%","as_of":"2026-09-30","source":null},{"label":"Net assets","value":"$46m","as_of":"2026-09-30","source":"the issuer\u2019s own daily fund list, as of Sep 30, 2026"},{"label":"Expense ratio","value":"0.75%","as_of":"2026-09-30","source":"485BPOS XBRL, Jan 8, 2026"}]},"b":{"ticker":"NASA","name":"Tema Space Innovators ETF","issuer":"Tema","desk":"themes","as_of":"2026-09-30","verdict":"NASA holds 35 stocks, and 97% of its weight is outside the S&P 500.","url":"https://etfiq.com/funds/nasa","key_facts":[{"label":"Already in the S&P 500","value":"2.6%","as_of":"2026-09-30","source":null},{"label":"Active share vs the S&P 500","value":"99.9%","as_of":"2026-09-30","source":null},{"label":"Top ten holdings","value":"66.1%","as_of":"2026-09-30","source":null},{"label":"Total return, since launch","value":"\u22124.8%","as_of":"2026-09-30","source":null},{"label":"Net assets","value":"$1.1bn","as_of":"2026-09-30","source":"issuer page, as of Sep 30, 2026"},{"label":"Expense ratio","value":"0.75%","as_of":"2026-09-30","source":"485BPOS XBRL, Mar 30, 2026"}]},"overlap_pct":51,"full_text_at":"https://etfiq.com/compare/themes/mars-vs-nasa"}