Brokerages from Citi Research to Nuvama Institutional Equities and Nomura, among others, have shared their notes on key companies after the first-quarter earnings announcement on Thursday.Citi and Nuvama have issued a 'sell' and a 'reduce' call on Tech Mahindra Ltd., respectively. Both Axis Bank Ltd. and AU Small Finance Bank Ltd. received a 'buy' call from other brokerages. Cyient Ltd. is kept on 'hold' by Nuvama.NDTV Profit tracks ...