Singapore shares may see a weak start on Wednesday as investors are likely to stay away from risky assets after a ratings downgrade on Ireland to junk status raises further concerns about Europe’s debt woes.

Singapore’s benchmark Straits Times Index <.FTSTI> fell 1.28% on Tuesday to 3,077.36 points. Here are some stocks and factors to watch:

Singapore port operator Portek International (PKIL.SI) may be in focus after it said Japan’s Mitsui & Co (8031.T) is making a conditional cash offer for the company at $1.40 each.

Singapore Press Holdings (SPRM.SI), which has a near monopoly of newspaper publishing in the city-state, reported a 30% drop in third-quarter net profit in the absence of earnings from property development.

ST Engineering (STEG.SI), the world’s largest aircraft repair firm, said its land systems arm ST Kinetics has won a contract worth over $65 million from SMRT Buses, a subsidiary of SMRT Corp (SMRT.SI).

Oil and gas services provider KS Energy (KSTL.SI) said on Tuesday its subsidiary and a consortium partner PT Pertamina Drilling Services Indonesia have been awarded a contract worth about US$98 million ($120 million) to provide development drilling rig services.

Budget carrier Tiger Airways (TAHL.SI) said a total of 6.2 million passengers flew with the airline in the 12 month to June 2011, up 18% from the preceding period.

Commodities firm Noble Group (NOBG.SI) said on Tuesday it has signed US$3.2 billion in revolving credit facilities, the company’s biggest syndicated loan deal ever.