GRI Standards with their modules are defined as one of the criteria for assessing the quality of non-financial statements of companies. It is assumed that most large companies that aim to improve their reputation, or aim to give the best possible picture of their business to business stakeholders and to all other interested parties, present all the data required by GRI standards in their non-financial statements, but it is not known whether this was actually implemented in practice when it comes to companies operating in the Republic of Croatia. The subject matter can be defined as an analysis of non-financial reporting on the example of 10 large Croatian companies through the application of the economic and environmental module of the GRI Standard. The aim of this paper is to determine the compliance of non-financial information releases published by companies with GRI standards relating to the economic and environmental part. In the theoretical part of the paper, corporate social responsibility is considered as one of the foundations for the creation of the GRI Standard. GRI Standards are also theoretically defined, with special reference to the economic and environmental module, followed by the creation of an index of compliance with the GRI Standards. The empirical part of the paper analyzes the non-financial reports of 10 large companies from the Republic of Croatia, namely INA d.d., HT d.d., Podravka d.d., Valamar riviera d.d., Petrokemija d.d., Kraš d.d., AD Plastik d.d., Atlantic group d.d., Cemex d.d. These are very different companies, if one looks at their activity, even though a couple of companies have a monopolistic position in the market. The analysis of the non-financial reports shows that it is necessary to make additional efforts to improve the quality of the non-financial reports of the company, since there are a large number of non-financial reports that have shown a high level of non-compliance with the GRI Standards in both modules and it is evident that non-financial reports are most commonly used in marketing purposes.