MUMBAI: TCS stock price fell 4% in Tuesday’s weak market after promoter Tata Sons completed the sale of about 2.3 crore shares early in the session that would fetch it about Rs 9,362 crore. Tata Sons, a holding company for most of the Tata Group companies, could use the proceeds from the stake sale to reduce total debt on its books in an attempt to avoid having to list under RBI rules.