Tata Sons, the holding company of the Tata group, has acquired the entire 18.98% stake held by Tata Industries in Tata Elxsi. Tata Sons acquired a total of 59.1 lakh shares at Rs 80 a share on March 24. Post-acquisition, the holding company’s stake is up at 38.2%, said Tata Elxsi in a notice to BSE.