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AMD shares go from positive to worst day since July, down 5%

Thomas Franck

Shares of Advanced Micro Devices AMD posted their worst day since July on Thursday as the popular semiconductor stock appeared to take a breather. AMD's stock sank 5.3 percent by the closing bell, finishing the day at $30.48, well below recent 12-year highs. The shares, which opened the day higher, rose more than 7 percent in the previous session amid Apple's latest iPhone unveil, an important annual event for Wall Street's top chipmakers.