Software stocks slid heavily overnight, dragging down the broader US market, and bleeding into the Australian open. The standout US sector is semiconductors, ripping up an astonishing 30% in value so far in April. But the heat of that rise, and unquenchable demand for semiconductors and computer chips, is becoming a problem, with the bull run looking unsustainable.

Watchlist: Texas Instruments, IBM, Cochlear

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