Since launching in November 2013, the total value of Wellesley loans now stand at £6,557,848.
The association are briefed with protecting lenders and promote the P2P industry.
Graham Wellesley, Joint chief executive officer of Wellesley said: “This admittance is a further endorsement of the Company’s platform.
“The Board thoroughly looks forward to working with the Association to promote the industry’s interests in the UK particularly as the sector becomes regulated by the FCA in April of this year.
“Our average monthly loan growth and average capital raisings puts us on target of becoming a major player within the P2P industry in a very short time.”
P2P investors have received fixed rates between 3.75% and 7.5%, while the average deposit per customer is around £10,000.