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The main TAIEX index was down 157.98 points at 6,764.59, after opening down 0.7 percent. Electronics shares fell 2.18 percent, with TSMC , the world's top contract chip maker, shedding 2.68 percent, and Apple supplier Hon Hai Precision tumbling 3.79 percent. The financial sub-index dropped 2.85 percent. The Taiwan dollar weakened 0.14 percent to trade at T$30.332. Foreign investors were net sellers on Wednesday, but remained net buyers of T$28.0 billion this month.