Environmental Finance Sustainable Awards judges deemed that NatWest's sustainable finance team "punches above its weight" when it comes to "investor service and tailored support, differentiated research, and market convening power".

In 2025, NatWest supported the issuance of the European Investment Bank (EIB)'s €1.5 billion ($1.98 billion equivalent at issuance) Sustainability Awareness Bond. This EIB trade captured £3.6 billion ($4.8 billion) worth of orders.

Earlier in the year, NatWest supported Region Île-de-France's €1 billion sustainable bond, with the issuer indicating ahead of the transaction that it would allocate the majority of funds to green projects. The deal was over four times oversubscribed.

Some of the other key transactions in the supranational, sub-sovereign and agency (SSA) sustainable bonds issuance category for NatWest in 2025 included the Asian Infrastructure Investment Bank, the International Development Association, BNG, and the International Bank for Reconstruction and Development.