Effwa Infra and Research's shares debuted on the NSE SME platform with a 90% premium on Friday, opening at Rs 155.8 compared to an issue price of Rs 82. Prior to listing, the company's shares traded at a premium of Rs 74. The IPO, consisting of a fresh equity sale of Rs 43 crore and an Offer for Sale (OFS) of Rs 7.68 crore, garnered strong investor interest, oversubscribing by over 200 times at close.