It has been officially said that there are now 21 members as below:
Anchorage

Andreessen Horowitz

Bison Trails

Breakthrough Initiatives

Calibra

Coinbase

Creative Destruction Lab

Farfetch

Lliad

Kiva Microfunds

Lyft

Mercy Corps

PayU

Ribbit Capital

Spotify

Thrive Capital

Uber

Union Square Ventures

Vodafone

Women’s World Banking

Xapo