At 12.30pm, the key index was down 6.74 points to 1,532.6, dragged lower by a slide in key heavyweights including Maybank and Tenaga Nasional.
Amid a mixed performance in the financial sector, Maybank was down five sen to RM8.10 while CIMB dropped five sen to RM4.82. Hong Leong Bank rose four sen to RM18.68 and Public Bank added one sen to RM4.07.
Other laggards on the blue-chip index included Press Metal shedding five sen to RM5.65, Axiata slipping three sen to RM4.08 and Sime Darby Plantation slipping seven sen to RM3.60.
In semiconductors, MPI lost 50 sen to RM45.14 while KESM rose 30 sen to RM12.86 and Vitrox climbed 18 sen to RM20.18.
Top actives were DNeX down two sen to 81 sen, KAB rising two sen to 41.5 sen and Sapura Energy unchanged at 11.5 sen.
While there were fears arising from China's property sector, investment appetite remained strong as large developed economies maintained supportive monetary policies to fuel the recovery trend.
Japan's Nikkei jumped 2.1% while South Korea's Kospi stepped back 0.1%.
China's main index was also down 0.1% while Hong Kong's Hang Seng stayed flat.
Australia's ASX200 was down 0.4%.