Selling pressure on Singapore shares not letting up, with US stock futures sharply lower, most Asian markets down, according to Dow Jones.

STI off 0.9% at 2,956.54 at 2:47 p.m.; support expected at 2,926 (July 21 low). With caution ahead of tomorrow’s June-quarter results from 5 component companies, including index heavyweight SingTel (Z74.SG), STI expected to remain depressed for rest of session.

Market breadth widens to 2.5 decliners for every gainer vs about 2 for 1 at midday.

“The market is unstable. I have a feeling there will be a big dip coming soon,” says a local house broker. Even companies turning in higher profits not spared, with Golden Agri-Resources (E5H.SG) off 2.5% at $0.585; plantation group reported 19.9% on-year rise in 2Q10 net profit to US$66.0 million ($89.4 million) during lunch break.

Enzer Corp. (545.SG) remains most active in market, +66.7% at $0.175 on foray into shipping business.