'''Renaissance Technologies LLC''', også kendt som '''RenTech'''<ref>{{Cite web |last=Weiss |first=Miles |date=2019-02-01 |title=Hedge Fund RenTech Created the Ultimate, Tax-Free IRA Account for Employees |url=https://www.bloomberg.com/news/articles/2019-02-01/rentech-created-the-ultimate-tax-free-ira-account-for-employees |url-status=live |access-date=2020-04-07 |website=Bloomberg |archive-date=7. april 2020 |archive-url=https://web.archive.org/web/20200407025052/https://www.bloomberg.com/news/articles/2019-02-01/rentech-created-the-ultimate-tax-free-ira-account-for-employees }}</ref> eller '''RenTec''',<ref>{{Cite web |date=2019-11-23 |title=Inside Renaissance Technologies Medallion Fund |url=https://atticcapital.com/inside-renaissance-technologies-medallion-fund/ |access-date=2020-04-07 |website=Attic Capital |language=en-US |archive-date=7. april 2020 |archive-url=https://web.archive.org/web/20200407025055/https://atticcapital.com/inside-renaissance-technologies-medallion-fund/ |url-status=live }}</ref> er en amerikansk [[hedgefond]], der ligger i [[East Setauket]], [[New York (delstat)|New York]],<ref name="bloomberg_July_2014">{{Cite web |last1=Mider |first1=Zachary R. |last2=Rubin |first2=Richard |date=11. juli 2014 |title=Renaissance Said Probed by Senate Panel on Tax Maneuver |url=https://www.bloomberg.com/news/articles/2014-07-12/renaissance-said-probed-by-senate-panel-on-tax-maneuver |access-date=26. december 2015 |publisher=Bloomberg |archive-date=5. januar 2016 |archive-url=https://web.archive.org/web/20160105060315/http://www.bloomberg.com/news/articles/2014-07-12/renaissance-said-probed-by-senate-panel-on-tax-maneuver |url-status=live }}</ref> på [[Long Island]], der er specialiseret i [[systematisk handel]] ved brug af [[Kvantitativ analyse (økonomi)|kvantitative modeller]], der er udarbejdet på baggrund af [[matematik|matematiske]] modeller, [[algoritmer]] og [[statistisk analyse]]. Firmaet bliver betragtet som den mest succesfulde hedgefond i verden.<ref>{{Cite web |last=Duggan |first=Wayne |date=2016-11-21 |title=Inside One Of The Most Secretive And Successful Hedge Funds In The World |url=https://www.benzinga.com/news/16/11/8724328/inside-one-of-the-most-secretive-and-successful-hedge-funds-in-the-world |access-date=2020-01-03 |website=Benzinga |language=en |archive-date=3. januar 2020 |archive-url=https://web.archive.org/web/20200103163210/https://www.benzinga.com/news/16/11/8724328/inside-one-of-the-most-secretive-and-successful-hedge-funds-in-the-world |url-status=live }}</ref> Deres signatur; Medallion fund e berømt for at have det bedste [[afkast]] nogensinde. Renaissance blev grundlagt i 1982 [[James Harris Simons|James Simons]], en prisvindende [[matematiker]] og tidligere kodebryder under [[den kolde krig]].
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