AMD, Samsung Demand Woes Spoil Rally in Semiconductor Stocks

A sizzling rally in global semiconductor stocks this week is starting to look illusory as a slew of disappointing earnings from major chipmakers pointed to a likely protracted downturn for the sector.

The Bloomberg Asia Pacific Semiconductors Index sank 1.6% Friday after gaining 6.7% earlier in the week. Taiwan Semiconductor Manufacturing Co. led the decline, dropping 2.9%. A gauge of European chip stocks fell for the first time in six sessions, and the selloff looks likely to spill over to the US, where the Philadelphia Semiconductor Index has jumped 8.8% this week.

Optimistic investors had been hoping that chip stocks finally were bottoming out after the Philadelphia index plunged 36% this year, the most since 2008. They got a rude awakening after Samsung Electronics Co., the world’s largest memory-chip maker, and PC-processor maker Advanced Micro Devices Inc. reported results that suggested a deeper-than-feared slowdown ahead.