Singapore shares may open slightly lower on Tuesday tracking losses on Wall Street overnight, as investors turn more cautious amid fears that Portugal will be the next euro zone member to need a bailout. Singapore’s benchmark Straits Times Index <.FTSTI> was down 0.98% on Monday to 3,229.27 points.

Here are some stocks and factors to watch:

Shares of Singapore budget carrier Tiger Airways (TAHL.SI) may be in focus after it said on Monday it carried 22% more passengers in December compared with the year-ago period.

Treasury China Trust (TRCT.SI), which develops commercial properties, said its real estate portfolio for 2010 rose 4.6% to 9.61 billion yuan ($1.88 billion).   

Swing Media Technology (SWMT.SI) said a group of investors has subscribed to a placement of 290 million new shares at $0.0409 each for a total of $11.9 million. The company will use the funds raised to repay bank borrowings and increase its working capital.

Consciencefood (CSHL.SI) said on Monday the production capacity of instant noodle at its factory in Medan, Indonesia has increased to 852 million packs a year from 741 million. It also plans to diversify its range of beverages to include natural juice and tea drinks.