S&P Global Ratings on Thursday upgraded ratings of five companies of the Tata group including Tata Steel, Tata Motors and Jaguar Land Rover (JLR) reflecting its reassessment of the ongoing influence and the potential for 'extraordinary financial support' from the parent, Tata Sons. Under the revised exercise, S&P Global said ratings on Tata Steel Ltd and its 100 per cent-owned financing subsidiary ABJA Investment Co Pte Ltd have been upgraded to 'BBB-' from 'BB' with stable outlook. Similarly, Tata Motors Ltd and its wholly-owned arm TML Holdings Pte Ltd have been upgraded to 'BB-' from 'B' ratings with stable outlook.