AU Small Finance Bank (AU SFB) has received RBI's letter dated 06 May 2026 according its approval to Kotak Mahindra Bank (KMBL) (along with its subsidiaries, the funds/schemes managed by KMBL's subsidiaries, collective referred as Kotak Mahindra Group) to acquire ‘aggregate holding' of up to 9.99% of the paid-up share capital or voting rights in AU SFB.