With the growth of the Internet, the choice of B2B e-commerce formats has expanded from Electronic Data Interchange (EDI) to a range of internet-based channels, such as e-marketplaces. Organisations can now adopt a portfolio of B2B ecommerce formats to support their electronic trading activities. In order to optimise their approach to B2B e-commerce, organisations must understand the range or choice of formats available. This paper builds upon existing B2B ecommerce format categorisations, resulting in a finite list of B2B e-commerce formats available to buyer and seller organisations. KEYWORDS E-commerce, e-marketplace, electronic trading, business-to-business, EDI, formats