The European Banking Federation, together with AFME, Cboe, EFAMA and EPTA, signed a joint letter urging the introduction of mandatory interoperability for European Union cash equities central counterparties in the Market Integration and Supervision Package, arguing that the change would increase competition and user choice, reduce clearing costs, improve collateral optimisation and netting efficiency, and should be supported by stronger open access provisions under Articles 35 and 36 of MiFIR and consistent supervisory oversight.