Big non-banking finance companies (NBFCs) backed by industrial houses like Bajaj Finance, Shriram Transport Finance, Tata Capital, Aditya Birla Capital, and Mahindra & Mahindra Financial Services will have to find a way around the Reserve Bank of India’s tightening regulations, as the Reserve Bank is unlikely to relax the rules allowing them to convert into banks or merge with banks like HDFC did.