Multilateral Development Banks Comparison Report 2026
Global Risk and Finance Forum / Asian Development Bank
Multilateral institutions
Asian Infrastructure Investment Bank
ShareholderInternational · Asia and other eligible member economies
A founding UK shareholding in the infrastructure-focused multilateral bank. Most of the UK subscription is callable rather than paid-in capital.
- UK ownership or participation
- 3.1288% of subscriptions · 28 Feb 2026
- Lead department or body
- HM Treasury
- UK voting rights
- 2.8533% · 28 Feb 2026
- Mandate
- Sustainable infrastructure and regional connectivity finance.
UK financial position
UK shareholding carrying value£562m31 Mar 2026
Treasury accounting valuation; not the dollar subscription.
Underlying source ↗UK subscribed capitalUS$3.0547bn30 Jun 2026
Total subscription, combining paid-in and callable capital.
Underlying source ↗UK paid-in capitalUS$610.9m30 Jun 2026
Paid-in component reported in AIIB note C15; separate from callable capital.
Underlying source ↗UK callable capitalUS$2.4438bn30 Jun 2026
Contingent capital obligation; not cash invested.
Underlying source ↗Accounting values, paid-in capital and funding commitments have different meanings and reporting dates. These figures are not added together.
Ownership and accountability
HM Treasury leads the shareholding and the Chancellor is UK Governor. The UK participates in a multi-country Board constituency.
Research hub
7 publications relevant to AIIB · Institution-specific research shown first
MDB Joint Methodologies for Measuring Mobilisation and Private Finance for Development
MDB Task Force on Mobilization / EDFI
Mobilising Private Capital for Growth, Resilience and Prosperity
OECD
News and announcements
View in News and announcements →- Development banks revise how they measure mobilisation and private finance ↗
BII, through EDFI, and UK-backed multilateral banks are covered by a new joint methodology package. It updates mobilisation rules and adds a separate generation measure for institution-backed finance; work on catalysation continues. The guides require these different indicators to remain separate. No new UK financial commitment is announced.
View in Research hub → - OECD examines how shareholders can strengthen private capital mobilisation ↗
New OECD research examines mandates, risk frameworks and staff incentives across development banks and DFIs, including BII and UK-backed multilaterals. It argues that mobilisation targets need to account for additionality and harder markets.
View in Research hub → - Treasury reports its EBRD and AIIB financial interests ↗
The annual accounts show €275m remained payable at March 2026 under the additional share subscription. The annual accounts report a £562m shareholding value and explain the separate callable-capital obligation.
View EBRD profile →