Singapore shares remained mired in the red zone on Monday, tracking regional losses, after US president Donald Trump doubled tariffs on steel and aluminum, while accusing China of violating a tariffs agreement.

The Straits Times Index (STI), a key benchmark for the Singapore Exchange, ranged between 3,871.54 and 3,905.94 throughout the day. It ended the session at 3,890.59, down 4.02 points or 0.1% compared to Friday's close.

Far East HTrust up 2.7%; KEPPEL REIT, Sheng Siong up 1%; Emperador Inc. down 17%; HPH Trust down 3%; Seatrium down 2.4%.

Shares of Grand Venture Technology (SGX:JLB) surged over 10% at the close with the company entering into confidential discussions with a third party for a possible transaction.

OKP (SGX:5CF) was up nearly 6% after it secured a contract worth SG$258.3 million from the Land Transport Authority for the construction of new cycling path networks in the East Region of Singapore.

Meanwhile, shares of Kingsmen Creatives (SGX:5MZ) were up over 1% at the close with the company striking off wholly owned subsidiaries, NAX Company and NAX Singapore.