The story
STOXX Limited began operations in 1998, when the EURO STOXX 50 blue-chip benchmark and other indices were launched. In 2000 STOXX was the first index provider to implement free float market capitalization in all its indices. In December 2009 Deutsche Börse and SIX Group became sole shareholders of STOXX after Dow Jones exited the joint venture. Shortly after STOXX renamed all indices by removing the "DJ/Dow Jones" prefix. In July 2010 STOXX became the marketing agent for Deutsche Börse and SIX Swiss Exchange indices.
In 2015 Deutsche Börse purchased the remaining 49.9% shares of STOXX from SIX Group along with the remaining shares of the joint venture Indexium AG at a cost of 650m Swiss Francs.
In 2019, STOXX was combined with Axioma Inc. to form Qontigo.
In 2023, STOXX became part of ISS STOXX which is part of the Investment Management Solutions business area of Deutsche Börse Group.
From Wikipedia’s article on STOXX, shared under CC BY-SA 4.0.4