TSMC (TSM) +1.9% and UMC -1.8% in Taipei after UMC warns it might post an NT$1B ($34M) Q1 operating loss due to a "slower than expected" manufacturing ramp for chips using its advanced 28nm process. TSMC began production of 28nm chips back in Q3 '11, and rapidly grew output in 2H12 after struggling with yield issues in 1H. TSMC's process edge over UMC and other foundries is a big reason why it has an outsized share of mobile chip orders, and is expected to continue gaining share in 2013.
TSMC (TSM) +1.9% and UMC -1.8% in Taipei after UMC warns it might post an NT$1B ($34M) Q1...
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