Standard and Poor’s has upped the outlook on Adani Ports and SEZ to ‘stable’ from ‘negative’ expecting better operating performance. It affirmed the ‘BBB—’ rating as S&P expects Adani Ports to sustain its improved operating performance on healthy revenue growth and strong pre-tax margins of 63-65 per cent. The company should commit to maintain the funds from operations to debt ratio at 15-20 per cent, S&P added.