In recent years, there has been a growing importance of sustainability communication and the role of the Internet in contemporary corporate communication that has allowed the diversification of information dissemination tools. Thus, the objective of this study is to determine the quantity and nature of the content of the information related to sustainability disclosed through the corporate website of Portuguese metal mould companies. The results obtained based on the content analysis seem to indicate that the number of metal mould companies that discloses sustainability information is quite low. Those who disclose information are in a very limited way whether in quantity or in relation to the type of information disclosed. Considering the various dimensions of sustainability, the information disclosed about environmental and social aspects is scarce. The focus is on aspects related to the economic dimension, particularly in the areas related to products and services and customers.