The asset management arm of BNP Paribas SA said using a different interpretation of “sustainable investment” than some of its peers has allowed it to keep the European Union’s top ESG tag attached to about $20 billion worth of funds.

Amundi SA is removing the European Union’s highest ESG designation from virtually all funds that once carried it, as it joins a growing list of investment firms that have been wrong-footed by a change in regulatory guidelines in the bloc.