Singapore shares incurred losses on Friday, closing in the red zone, amid broader regional declines, weighed down by investor sentiment.

The Straits Times Index (STI), a key benchmark for the Singapore Exchange, ranged between 4,975.14 and 5,003.18 throughout the day. It ended the session at 4,989.08, down 6.86 points or 0.1% compared to Thursday's close.

On the corporate front, shares of AJJ Medtech (SGX:584) crashed nearly 17% at the close as its attributable loss to equity holders widened to SG$563,000 in the first quarter from SG$234,000 a year earlier.

Marco Polo Marine (SGX:5LY) shares closed nearly 4% higher as the company agreed with Fuji Offset Plates Manufacturing (SGX:508) for a reverse takeover transaction involving the company's subsidiaries, Marco Polo Shipyard and MP Marine.

Meanwhile, Aspial Lifestyle (SGX:5UF) outlined plans to raise around SG$84.8 million in gross proceeds via an equity fund raising.

STI down 0.1%; SIA up 2%; SingPost down 6%; Nio, Seatrium down 2%; Singtel, Keppel down 1%.