Nifty May Futures ended at 14 points premium to spot at 4093 on Wednesday. The May series added open interest (OI) of around 6.32 lakh shares. June futures saw addition of 7,150 shares in OI.On the index options front, the Nifty May 4100 Call has seen build-up of 28% of the total open interest in Calls. Total OI in Calls increased to 112.74 lakh, of which, OI at 4100 May Call was 35.59 lakh; OI at 4200 Call was 28.28 lakh, and OI at 4000 Call was 13.49 lakh. OI at 4250 Call was 12.40 lakh.On the other hand, the Nifty May 4000 Put accounted for 24% concentration of the total OI in Puts. The total OI in Puts rose to 143.79 lakh, of which, OI at May 4000 Put was 34.53 lakh. OI for Nifty 4100 Put stood at 27.19 lakh and OI for 3800 and 3900 Put was around 14.69 lakh and 14.16 lakh shares, respectively. OI at 4150 Put was 9.25 lakh.Concentration of nearly 50% open interest at 4100 and 4200 Calls suggest that the Nifty will face stiff resistance around these levels during the May series. At the same time concentration of 43% OI at 4100 and 4000 Puts suggest strong support at these levels. The Nifty OI Put-Call ratio was down at 1.13. While Nifty Call options saw an addition of 8.87 lakh shares in OI, Put options saw increase of 3.82 lakh shares.
