As of December 2015, all of the 57 Prospective Founding Members of AIIB had signed the Articles of Agreement. The initial signatories were Australia, Austria, Azerbaijan, Bangladesh, Brazil, Brunei Darussalam, Cambodia, China, Denmark, Egypt, Finland, France, Georgia, Germany, Iceland, India, Indonesia, Iran, Israel, Italy, Jordan, Kazakhstan, Republic of Korea, Kyrgyz Republic, Kuwait, Lao PDR, Luxembourg, Malaysia, Maldives, Malta, Mongolia, Myanmar, Nepal, Netherlands, New Zealand, Norway, Oman, Pakistan, Philippines, Poland, Portugal, Qatar, Russia, Saudi Arabia, Singapore, South Africa, Spain, Sri Lanka, Sweden, Switzerland, Tajikistan, Thailand, Turkey, the United Arab Emirates, the United Kingdom, Uzbekistan, and Vietnam. As of 21 March 2018, AIIB had 86 approved members/prospective members in total (including Hong Kong).
The AIIB Articles of Agreement entered into force on 25 December 2015. On 16 January 2016, the Board of Governors held its inaugural meeting, declaring the Bank open for business and electing Mr. Jin Liqun as President for an initial five-year term.