Of the 309 companies through Wednesday that didn't change their guidance, 49 percent fell on the trading day after the announcement.

Shares of the two companies, both based in Montreal, fell sharply after the announcement.

Cray shares fell 33 cents, to $2.04, after the announcement.

Its stock fell after the announcement but then rallied somewhat.

Asian stock markets fell soon after the announcement, due to similar concerns.

The stock fell 6 percent immediately after the announcement.

Shares fell 2.7 percent in after-hours trading after the announcement.

Shares of Cisco fell 95 cents, to $13.70, after the announcement.

The stock fell from $11.94 a share to $9.85 the day after the announcement.

Long-term interest rates, which had been on the sticky side all year, fell sharply after the announcement.