However, the buyer of the shares could not be ascertained immediately.
At the end of March quarter IFC held 7.95 per cent stake in the company.
AU Bank today slumped by 2 per cent to end at Rs 634.05.
The bank made its stock market debut last year after existing investors sold a part of their stake in the company.
It received licence from the RBI to set up a small finance bank in December 2016 and commenced its operations from April 2017.
The shares were purchased by Jasmine Capital Investments Pte Ltd.
Shares were sold at an average price of Rs 704.35, the data showed.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)