On 27 April 2021, the European Parliament adopted a decision on the conclusion of an interinstitutional agreement between the European Parliament, the Council of the European Union, and the European Commission on a mandatory transparency register. The text was adopted with 645 votes in favour, five votes against, and 49 abstentions. It shall enhance the transparency of the EU decision-making process and foster the accountability of the EU institutions.

The adopted text brings major changes to the already existing Transparency Register, making it mandatory for interest representatives to register themselves before carrying out certain lobbying activities (see Annex A to the Agreement) relating to any of the three signatory institutions (the European Parliament, the Council of the European Union, and the European Commission). The Parliament also made clear that the agreement covers indirect lobbying activities, especially since such activities have become more important during the Covid-19 pandemic.