The purpose of this paper was to clarify and approximate the concept of corporate social responsibility as well as GRI guidelines related to the concept of CSR, and to see how informed are stakeholders, all stakeholders, about the activities and effects of companies on the environment through the Sustainability Report. 48 Sustainability reports are not legally prescribed or mandatory, companies do them voluntarily, and in order to be as comparative as possible, GRI guidelines have been developed, now the fourth generation of them, according to which companies compile their Sustainability Reports. The goal of each of the companies, especially those that have a perceived negative impact on the environment in public, is certainly to respond to all stakeholders through the Sustainability Report, by processing as many GRI indicators as possible. Such companies need to emphasize to the public how much they invest in the concept of corporate social responsibility and to what extent they protect the environment, given that the public is increasingly aware and informed about the negative impact. Likewise, companies need to take responsibility for their negative impacts. The aim of this paper was to determine the extent to which the Sustainability Report of AD Plastik is in line with the GRI guidelines. The company AD Plastik has been a positive example of reporting on corporate social responsibility for years, and thus certainly improves the image of itself in public, attracts new employees, better manages costs, recycling materials, which in turn leads to increased revenue for the company. From the above it can be concluded that the compilation of the Sustainability Report, in addition to creating a positive image, is to the greatest extent actually beneficial to the companies themselves.