Several Indian companies are set to impact trading today. Infosys launches a Rs 18,000 crore share buyback. Tata Consultancy Services secured a five-year deal with NHS Supply Chain. Hindustan Unilever set a record date for its ice-cream business demerger and appointed a new director. Major bulk and block deals involving One 97 Communications (Paytm) and Mphasis are also in focus, alongside project wins and new product launches by other firms.