Singapore shares ended marginally lower on Monday, while regional sentiment remained mixed, as investors geared up for possible trade deals with the US.

The Straits Times Index (STI), a key benchmark for the Singapore Exchange, ranged between 3,958.04 and 3,971.70 throughout the day. It ended the session at 3,964.29, down 1.91 points or 0.05% compared to Friday's close.

In company news, shares of H2G Green (SGX:5AI) were up over 14% at the close with the company's subsidiary, GasHubUnited Utility, awarded a project to design, construct, install, and commission a liquefied natural gas storage and regasification facility at the Rolls-Royce Seletar Campus in Singapore.

Ecowise's (SGX:5CT) shares surged over 19% with the company's attributable profit to equity holders surged 83% in fiscal Q4 to SG$511,000 from SG$280,000 a year earlier.

Meanwhile, shares of Rex International (SGX:5WH) were down nearly 3% at the close with its subsidiary, Rex Oman, initiating a process to explore debt financing alternatives for its Oman activities.