Singapore shares remained in the red on Wednesday, with Iran continuing to insist on the provisions of its agreement with the US to be implemented before a final deal.

The Straits Times Index (STI), a key benchmark for the Singapore Exchange, ranged between 5,158.63 and 5,196.54 throughout the day. It ended the session at 5,161.50, down 9.15 points or 0.2% compared to Tuesday's close.

On the corporate front, shares of NoonTalk Media (SGX:SEJ) surged nearly 27% at the close as it signed a non-binding MoU with Neusoft Education Technology to explore collaboration opportunities in AI for AI-generated content and other initiatives.

ASTI Holdings (SGX:575) closed nearly 2% higher as it received the first installment of a settlement payment of SG$300,000 from Advanced Systems Automation (SGX:WJ9).

Meanwhile, ISOTeam (SGX:5WF) secured around SG$20.4 million worth of contracts.