Singapore shares remained in the red zone on Wednesday as the Monetary Authority of Singapore decided to keep the city-state's monetary policy unchanged.

The Straits Times Index (STI), a key benchmark for the Singapore Exchange, ranged between 4,202.25 and 4,234.77 throughout the day. It ended the session at 4,219.41, down 10.00 points or 0.24% compared to Monday's close.

In economic news, The Monetary Authority of Singapore (MAS) kept its monetary settings unchanged, after stronger than expected year-on-year growth during the second quarter of the year.

Meanwhile, Singapore's total employment rose by 8,400 in the second quarter of the year, higher than in the previous quarter but lower a year earlier, according to data released by the Ministry of Manpower.

In company news, shares of Samudera Shipping Line (SGX:S56) were up nearly 6% at the close with the company's attributable profit to owners up 100% in H1 to $41.8 million from $20.9 million a year earlier.

CDL Hospitality Trusts' (SGX:J85) shares were down nearly 3% as the trust's distribution per stapled security declined 21% in H1 to SG$0.0198 from SG$0.0251 a year earlier.

Meanwhile, shares of Seatrium (SGX:5E2) were up nearly 1% at the close as the company agreed to pay about SG$168.4 million to settle a corruption probe in Brazil.