While most management teams that have warned of a revenue hit said they don't expect any impact to full-year figures, many expect a drag in the first quarter. Nearly one in five S&P 500 companies have said China's virulent coronavirus will impact their revenues or profits, underscoring the far-reaching toll the disease is expected to take on businesses around the world. "We also expect that there will be an impact on future bookings in China, especially in the immediate aftermath of the illness. Others, like Apple , said that they've issued broader-than-usual revenue ranges for the first quarter to account for the potential impact. Three hundred ninety-two of the 500 S&P components have reported fourth-quarter earnings as of Friday.

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