Singapore’s Straits Times Index dropped 1.6% to 3,179.72 at the close of trading, erasing this year’s advance. The gauge fell 0.3% this month. All but three stocks in the benchmark index of 30 companies fell.

Shares on the measure trade at an average 14.5 times estimated earnings, compared with about 15.6 times at the end of 2010, according to data compiled by Bloomberg. The following shares were among the most active in the market.

Micro-Mechanics Holdings (MMH SP), a manufacturer of tools for the semiconductor industry, gained 2.1% to 49.5  cents. The company said second-quarter profit doubled to $1.80 million.

 

Neptune Orient Lines (NOL SP), which is Southeast Asia’s biggest container carrier and gets about a quarter of its revenue from Asia and the Middle East, slipped 1.8% to $2.20. Egyptian protesters defied a curfew and demonstrated against President Hosni Mubarak for a sixth day.