This report of the Independent Expert Group (IEG), appointed under the auspices of the 2023 Indian G20 Presidency, recommends a triple agenda of reforms to multilateral development banks (MDBs). The three elements of this agenda are: (1) adopting a triple mandate of eliminating extreme poverty, boosting shared prosperity, and contributing to global public goods; (2) tripling sustainable lending levels by 2030; and (3) creating a third funding mechanism which would permit flexible and innovative arrangements for purposefully engaging with investors willing to support elements of the MDB agenda.