Singapore shares were marginally lower on Friday, with regional indices mixed as markets resumed business following the Christmas holiday.

The Straits Times Index (STI), a key benchmark for the Singapore Exchange, ranged between 4,621.10 and 4,647.45 throughout the day. It ended the session at 4,636.15, down 0.19 points or 0% compared to Wednesday's close.

In economic news, Singapore's manufacturing output increased 14.3% year-on-year in November, backed by increased outputs from several clusters, according to data from EDB Singapore.

In corporate news, shares of GDS Global (SGX:5VP) were up nearly 3% at the close as it received a listing and quotation notice from the SGX, for the listing of around 60 million shares.

Keppel REIT's (SGX:K71U) shares were down nearly 1% after its subsidiary, Keppel REIT Fin. Company, secured three bridge loan facilities worth nearly SG$892.0 million.

Meanwhile, Raffles Education (SGX:NR7) was up nearly 1% at the close as it issued and allotted 11.5 million conversion shares at SG$0.065 per share to raise around SG$749,197.