The principle of integrated reporting (IR) that brings the financial and the non-financial information into one report is more and more accepted by corporate leaders. The idea of the study I propose is to measure the value relevance of IR and the way assurance practices can have an influence on European firms from the following list from the STOXX Europe 50 index over the 2010-2016 period. In this study by using the Ohlson valuation model, it is found that the introduction of IR into the mandatory reporting environment creates a negative impact on the market valuation due to the high costs of implementation more than benefits in a voluntary compliance. Surprisingly enough, reliability guarantee from trusty suppliers and apparent reporting standards do not lead to more real value relevance for IR. In fact, information dissemination becomes another dimension to take into account since it has approval or disapproval depending on the reporting quality for firms without providing high-quality investor relations(IR).

The principle of integrated reporting (IR) that brings the financial and the non-financial information into one report is more and more accepted by corporate leaders.