Most of ADB's lending comes from its ordinary capital resources, offered at near-market terms to lower- to middle-income countries. ADB also provides loans and grants from Special Funds, of which the Asian Development Fund is the largest. The Asian Development Fund offers loans at very low interest rates and grants that help reduce poverty in ADB's poorest borrowing countries.

In 2013, ADB’s operations totaled $21.02 billion, $14.38 billion financed by ADB and Special Funds and $6.64 billion by cofinancing partners. 

In 2013, official cofinancing from development partners increased by 77% compared to 2012 and reached $3.85 billion. The total official cofinancing amounting to $3.85 billion was for 208 projects. This includes loan cofinancing of $3.09 billion for 23 projects, grant cofinancing for investment projects of $485.6 million for 29 projects and grant cofinancing for technical assistance of $278.2 million for 163 projects. Loan cofinancing remains the largest component of official cofinancing.

Partnering with other development organizations helped ADB to achieve better results for DMCs.