As per SEBI circular SEBI/HO/MRD/DP/CIR/P/2018/67, a stock has to meet the following criteria for 6 months to include in it FNO.
i)The stock shall be chosen from amongst the top 500 stocksin terms of average daily market capitalization and average daily traded value in the previous six months on a rolling basis’,
(ii)The stock’s median quarter-sigma order size overthe last six months, on a rolling basis, shall not be less than₹25 Lakh,
(iii)The market wide position limit in the stock shall not be less than ₹500 crore on a rolling basis,and
(iv)Average daily deliveryvalue in the cash market shallnot be less than ₹10 crore in the previous six months on a rolling basis.
Ref: SEBI | Review of Framework for Stocks in Derivatives Segment