Nifty May Futures ended at 10 points premium to spot at 4130 on Monday. The May series saw a drop in open interest (OI) of around 6.29 lakh shares. June futures saw addition of 83,300 shares in OI.On the index options front, total OI in Calls went up by 2.82 lakh shares to 135.10 lakh, of which, OI at 4100 May Call was 36.03 lakh (26.7%); OI at 4200 Call was 28.80 lakh (21.3%), and OI at 4000 Call was 14.12 lakh (10.5%). OI at 4250 Call was 13.67 lakh.On the other hand, the Nifty May 4000 Put accounted for 23.4% concentration of the total OI in Puts. The total OI in Puts increased by 3.35 lakh shares to 163.47 lakh, of which, OI at May 4000 Put was 38.18 lakh. OI for Nifty 4100 Put stood at 30.44 lakh (18.6%) and OI for 3800 and 3900 Put was around 15.94 lakh and 15.80 lakh shares, respectively. OI at 4150 Put was 11.74 lakh.Concentration of nearly 31% open interest at 4200 and 4250 Calls suggest that the Nifty could face stiff resistance around these levels during the May series. At the same time, 4100 level could act as an support owing to concentration of nearly 19% OI at that level.The Nifty OI Put-Call ratio was unchanged at 1.21.
