ICMA co-operates globally with other securities regulatory agencies through its membership of the International Organization of Securities Commissions (IOSCO) and with other trade associations through the International Council of Securities Associations (ICSA) whose members represent and/or regulate the vast majority of the world's equity, bond and derivatives markets.  

ICMA is a founder member of the European Financial Markets Federation (EFMF).

The Association has established memoranda of understanding with the following organisations:

• The Association of National Exchanges Members of India (ANMI)
• International Islamic Financial Market (IIFM)
• Japan Securities Dealers Association (JSDA)
• National Association of Financial Market Institutional Investors (NAFMII)
• National Securities Market Association (NSMA)
• Taiwan Securities Association (TSA)
• Treasury Markets Association (TMA)
• Singapore Investment Banking Association (SIBA)

ICMA also works closely with:

• ACI UK - The Financial Markets Association
• ANBIMA - Brazilian Financial and Capital Markets Association
• ASSIOM FOREX The Financial Markets Association of Italy
• Australian Financial Markets Association (AFMA)
• Bundesverband der Wertpapierfirmen an den deutschen Börsen e.V. (bwf)
• Emerging Market Traders Association (EMTA)
• International Securities Services Association (ISSA)
• Nordic Capital Markets Forum (NCMF)
• The Danish Securities Dealers Association (Børsmæglerforeningen)
• The Futures and Options Association (FOA)