Synopsis The lot size has been reduced to 50 from the existing 75, NSE said in a circular on Wednesday. ETMarkets.com Contracts with August 2021 weekly expiry and beyond will have revised market lots. NEW DELHI: The National Stock Exchange (NSE) has slashed the market lot size for derivative contracts on Nifty 50, a move that will reduce the burden of excessive upfront margins for retail traders. The lot size has been reduced to 50 from the existing 75, NSE said in a circular on Wednesday. The reduction in the lot size for NIFTY will reduce the margin requirements for futures trading by one-third, stockbroking firm FYERS CEO Tejas Khoday said.