Singapore's stock market extended losses on Monday to start the week in red, tracking losses in global markets over the weekend.

The Straits Times Index (STI), a key benchmark for the Singapore Exchange, ranged between 3,775.00 and 3,796.74 throughout the day. It ended the session at 3,791.70, down 9.86 points or 0.26% compared to Friday's close.

Singtel rose 1.6%; Sembcorp Industries rose 0.92%; OCBC Bank fell 0.76%; Keppel DC Reit, Genting Sing fell 2.7% each.

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In company news, Clearbridge Health plunged 25% on Monday's close, as it completed the placement of 309.5 million shares to Ong Choon Yi at an issue price of SG$0.0031 per share and an aggregate consideration of SG$959,450.

Grand Venture Technology was down over 2% at the close after it formed a partnership with the Agency for Science, Technology and Research (A*STAR) to develop a customized manufacturing platform for advanced ceramics.

Meanwhile, shares of Leader Environmental were up nearly 8% after it completed the disposal of all shares in the capital of AIWater and UG Water to WJL Holding through its wholly owned subsidiary, United Greentech.