Singapore’s Straits Times Index gained 0.8% to 3,170.33 at the close, its highest level since Feb. 8. Seven stocks rose and for each that fell in the benchmark index of 30 companies.

Shares on the measure trade at an average 14.4 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. Stock symbols are in parentheses after the company name.

City Developments (CIT SP), Singapore’s second-biggest developer, gained 1.2% to $11.74. The company said it and partners paid the government $413.3 million for a property in Bartley Road in northeastern Singapore. A residential condominium will be built on the site, it said.

Ezion Holdings (EZI SP), a provider of marine logistics and support services, rose 2.2% to 70.5 cents. The company said its newly-formed joint venture with Australia’s Buccaneer Energy won a US$109.5 million ($138 million) contract to provide a jack-up rig in Alaska.

Gallant Venture (GALV SP), the owner of industrial parks and resorts in Bintan, Indonesia, surged 18% to 50 cents, prompting the Singapore Exchange to ask the company to explain the reason for the jump in its share price. The company said it was not aware of any specific reason, except that DBS Group Holdings recommended its stock as a “buy.” “We believe the development of Lagoi Bay as an integrated resort will spur much investor interest and land sales in the future,” Derek Tan, an analyst at DBS, wrote in a note to clients today. The brokerage had a share-price forecast of 88 cents for Gallant.

Hiap Seng Engineering (HSE SP), the provider of engineering services in the oil and gas industry, jumped 6.9% to 54.5 cents. The company said it received an $8.4 million refinery maintenance contract in Vietnam.

OKP Holdings (OKP SP), the road builder, climbed 4.8% to 65 cents after the company said it won a $61.7 million from the Singapore government.