Singapore shares closed marginally higher on Thursday, maintaining to 4,000 threshold, as the city-state reported marginal improvement in its manufacturing activity for June, mirroring mixed gains in the region ahead of key US jobs data.

The Straits Times Index (STI), a key benchmark for the Singapore Exchange, ranged between 4,001.84 and 4,019.57 throughout the day. It ended the session at 4,019.57, up 8.80 points or 0.22% compared to Wednesday's close.

In economic news, Singapore's manufacturing activity, measured by the purchasing manager's index (PMI), was up slightly to 50 points in June from 49.7 points in May, according to a report by the Singapore Institute of Purchasing and Materials Management (SIPMM).

In company news, shares of Addvalue Technologies (SGX:A31) were over 13% at the close with the company gaining new orders worth about $1.5 million for its software defined radio modules.

Shanaya (SGX:SES) was up nearly 8% after the company received a consent letter from JTC for the proposed disposal of its Kian Tech facility in Singapore.

Meanwhile, Sanli Environmental (SGX:1E3) entered into a placement agreement for up to 33,333,333 shares at SG$0.12 per share to raise up to SG$4 million.