Companies have to communicate to be noticed on the market, to promote their services and products, and to give assurances that they are a credible partner in the relationship with stakeholders. In this paper, starting from the importance of marketing communication in business, the influence of sustainability communication on the success of the business was explored for the companies listed on the Stock Exchange for the period 2020–2021, during the financial crisis, seeking to show the awareness of the difficult moment and the use of communication. Then, based on the relevance of accounting information model, the relationship between the level of sustainability communication and the share price, basically its influence on the future performance of the company was explored. The regression analysis emphasizes the positive influence of the index of sustainability communication on the share price. The results of this study confirmed the link between sustainability communication and financial performance of business organizations that functioned during the time 2020-2021 in Sri Lanka.