OCBC, which was trading ex-dividend, was the top decliner, slipping 3.6 per cent to S$13.75. Meanwhile, UOB, which reported a 1.6 per cent year-on-year decline in first-quarter net profit on Wednesday, fell 2.2 per cent to S$29.88, while DBS shares closed 0.6 per cent lower at S$35.71.