Singapore's shares closed lower on Friday, tracking losses in the regional markets, ahead of key US jobs data.

The Straits Times Index (STI), a key benchmark for the Singapore Exchange, ranged between 3,898.85 and 3,930.02 throughout the day. It ended the session at 3,914.48, down 2.58 points or 0.07% compared to Thursday's close.

In economic news, Singapore's official foreign exchange reserves grew to SG$511.6 billion in February, from SG$510.6 billion in January, preliminary data from the Monetary Authority of Singapore showed.

In company news, shares of Katrina Group (SGX:1A0) were down over 4% after the company increased its issued share capital to 250.5 million shares after allotting and issuing of 33,800 new shares following a warrant exercise.

Shanaya (SGX:SES) were up nearly 6% at the close after its unit Shanaya Environmental Services has agreed to conduct a feasibility study with Hong Kong-based Zym-Tec Road Technologies for a 30-kilometer coal transport road in East Kalimantan, Indonesia.

Katrina Group (SGX:1A0) were down over 11% after the company increased its issued share capital to 250.5 million shares after allotting and issuing of 33,800 new shares following a warrant exercise.

Meanwhile, shares of ValueMax (SGX:T6I) were up over 1% after it launched the eight series of its three-month commercial paper in digital securities, priced at a 4.3% per annum, on the SDAX Exchange.

STI fell 0.1%; UOL rose 1.6%; Singtel rose 0.9%; SIA rose 0.6%; AEM fell 3%; Olam fell 2.6%; ThaiBev fell 1.9%; Nio fell 1.4%.