COSSIOM* (Market Data Information Systems and Services Committee for Market Operators) is a French non-profit market data user group association which monitors technological and administrative changes in market data information and provision. The activity is focused on the provision of financial information and related services used in the Front Office.

COSSIOM is a user group that welcomes members from all kinds of financial institutions. This includes individuals from banks and insurance companies in addition to portfolio managers, stock exchange members, etc.

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*COmité chargé des Services et Systèmes d'Informations destinés aux Opérateurs de Marchés