Singapore shares surged on Tuesday, despite mixed fortunes in the regional markets, as investors await minutes from the U.S. Federal Reserve's recent policy meeting.

The Straits Times Index (STI), a key benchmark for the Singapore Exchange, ranged between 4,643.36 and 4,665.12 throughout the day. It ended the session at 4,655.38, up 21.74 points or 0.5% compared to Monday's close.

In corporate news, shares of Jiutian Chemical (SGX:C8R) were up over 4% as its subsidiary Anyang Jiutian Fine Chemical reached an agreement with Anyang Chemical Industry to terminate a proposed investment in a synthetic ammonia project and the lease of a urea production facility.

UltraGreen.ai (SGX:ULG) was up over 1% as the company secured regulatory approvals for its Verdye injections systems in Malaysia and the Philippines

Meanwhile, GDS Global (SGX:5VP) raised around SG$4.1 million through the placement of 60 million shares at SG$0.068 per share.

STI up 0.5%; Nio up 4%; Seatrium, ST Engineering, OCBC up 1%; SingPost, YZJ Fin Hldg fell 1%.