Singapore shares remained rooted in the red zone on Wednesday, despite all other regional indices responding positively to a China-US agreement to diffuse trade tensions.

The Straits Times Index (STI), a key benchmark for the Singapore Exchange, ranged between 3,907.91 and 3,933.52 throughout the day. It ended the session at 3,919.05, down 14.75 points or 0.37% compared to Tuesday's close.

Ho Bee Land, Riverstone up more than 5%; Centurion up 3.4%; SIA Engineering up 2.6%; DBS down 0.6%; YZJ Shipbldg down 1.3%.

In company news, shares of Koh Brothers Eco Engineering surged over 14% at the close with its subsidiary, Koh Brothers Building and Civil Engineering Contractor, securing a SG$999 million contract from Changi Airport Group through an integrated joint venture with Penta-Ocean Construction.

Centurion was up over 3% after it filed a listing application to the Singapore Exchange and submitted various applications to the Monetary Authority of Singapore in connection with the proposed initial public offering of a REIT.

Meanwhile, shares of Singapore Paincare slipped nearly 5% at the close after Advance Bridge Healthcare said that it has no intention to increase its scheme consideration to acquire all ordinary shares in the company.