These are the five worst-performing STI stocks of 2015

Most counters booked double-digit losses.

Most of Singapore's largest stocks experienced hefty losses in the past year. The benchmark Straits Times Index dropped 14.3% in 2015, dragged by the extremely poor performance of its constituents.

Data from Bloomberg show that the worst performer was commodity trader Noble Group, whose share price declined 64.91% in 2015 following a spate of short-seller attacks. The next worst-performers were Sembcorp Marine and Sembcorp Industries, which declined 46.32% and 31.46, respectively, on back of the sharp decline in commodity prices.

Meanwhile, resorts operator Genting Singapore dropped 28.7% on back of persistently weak gaming revenue. Lastly, Keppel Corporation dropped 26.4% last year on back of the bearish outlook on rigbuilding.

Other poor performers include Golden Agri-Resources, City Developments, Hutchison Port Holdings, United Overseas Bank, and DBS Group Holdings.

On the contrary, four stocks managed to book positive price returns in 2015. These include SATS, ComfortDelGro, Hongkong Land Holdings, and Capitaland.