Tata invested personal savings in Snapdeal – one of India's leading e-commerce websites –and, in January 2016, Teabox, an online premium Indian Tea seller, and CashKaro.com, a discount coupons and cash-back website. He has made small investments in both early and late stage companies in India, such as INR 0.95 Cr in Ola Cabs. In April 2015, it was reported that Tata had acquired a stake in Chinese smartphone startup Xiaomi. In October 2015, he partnered with American Express, investing in Bitcoin venture Abra. In 2016, he invested in Nestaway an online portal to find fully furnished flats for bachelors which later acquired Zenify to start family rental segment and online pet care portal, Dogspot. Tata Motors rolled out the first batch of Tigor Electric Vehicles from its Sanand Plant in Gujarat, regarding which Ratan Tata said, "Tigor indicates a willingness to fast-forward India's electric dream. The government has set an ambitious target to have only electric cars by 2030."
In one of the most dramatic developments in the recent past, the board of directors of Tata Group on 24 October 2016 voted for the removal of its chairman Cyrus Mistry with immediate effect and made Ratan Tata the interim chairman, and in February 2017, Mistry was removed as a director for Tata Sons. The National Company Law Appellate Tribunal(NCLAT) had decided in December 2019 that the removal of Cyrus Mistry as the Chairman of Tata Sons was illegal and that he should be reinstated. India's Supreme Court heard an appeal by the $111-billion conglomerate to quash the NCLAT order that directed the Tata group to rehire the man it fired as chairman. Ratan Tata is personally leading the charge in the case, and filed a separate petition challenging the ruling in the Supreme Court. The Supreme Court has stayed the National Company Law Appellate Tribunal (NCLAT) order that allowed Cyrus Mistry to be reinstated as Tata Sons chairman in January 2020..
In October 2016, Tata Sons removed Cyrus Mistry as its chairman, nearly 4 years after he took over the reins of the over $100 billion conglomerate, Ratan Tata made a comeback, taking over the company's interim boss for 4 months. On 12 January 2017, Natarajan Chandrasekaran was named as the chairman of Tata Sons, a role he assumed in February 2017.