Singapore's Straits Times Index were falt on Wednesday, following mixed performances in the regional markets and a drop in retail sales.

During the day, the benchmark Singapore Strait Times Index ranged between 3,328.19 and 3,350.18, ending 0.27% or 8.93 points lower at 3,330.01.

In economic news, Singapore's retail sales were down 1.2% year over year in April to SG$3.9 billion after an upwardly 2.8% growth in March, data from Statistics Singapore on Wednesday showed.

In company news, Ever Glory United (SGX:ZKX) was down nearly 4% after it issued and allotted 4,125,000 tranche B consideration shares to vendors following the completion of the proposed acquisition of Fire-Guard Engineering.

Shares of Seatrium (SGX:5E2) were down over 3% after it bought back 1,058,000 shares for around SG$1.9 million or SG$1.77 per share.

Singapore Post (SGX:S08) was down 1% after it was given a rating of BBB with a negative outlook by S&P Ratings, with the American ratings agency expecting the company to reduce its indebtedness.