Singapore Telecommunications (Singtel) has sold a 1.2% direct stake in Sunil Mittal-owned telecom company Bharti Airtel for $ 1.54 billion. Following the stake sale, Singtel’s holding in Airtel will decrease from 29.5% to 28.3%. The company, in an exchange filing on May 16 said, the stake sale deal aims to streamline its portfolio and enhance long-term shareholder value.