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Warnings hit 3Com, Xilinx in after-hours trading

Shares of Xilinx and 3Com fall in after-hours activity after the companies warn that their financial performance for the December quarter will fall short of expectations.

Shares of Xilinx and 3Com on Monday fell in after-hours activity after the companies warned that their financial performance for the December quarter will fall short of expectations.

Chipmaker Xilinx announced at the end of regular trading that revenue for the third fiscal quarter will grow only 5 percent to 7 percent from the second quarter. The company previously estimated a growth rate of 12 percent.

The San Jose, Calif.-based company blamed the results on a slowdown in November bookings from North American customers. Xilinx added that orders from Europe, Japan and Southeast Asia remain on track for the quarter.

The company also announced that it expects inventory to increase to the higher end of its previous estimate of 150 to 180 so-called inventory days.

Xilinx shares fell $4.44, or about 11 percent, to $37.25 in after-hours trading. During the day, the stock gained $1.69 to $41.69.

Network equipment maker 3Com also released disappointing earnings news after the markets closed.

3Com expects to post revenue of $765 million to $780 million during the second quarter ended Dec. 1. That compares with the company's previous estimate of $870 million to $910 million, a shortfall of 10 percent to 16 percent.

3Com said the revenue miss should result in a pro forma net loss of 19 cents to 23 cents a share, compared with a previous loss estimate of 7 cents to 9 cents.

The company attributed the shortfall to slower-than-expected sales to Internet service providers.

In after-hours trading, the Santa Clara, Calif.-based company's shares fell $3.57, or about 27 percent, to $9.81. In regular trading hours, 3Com gained 44 cents to $13.38.

Meanwhile, shares of RF Micro Devices also traded heavily after hours. The chipmaker was added to the Standard & Poor's MidCap 400 index after the close of trading Monday. During the day, RF Micro rose $5.75, or 27 percent, to $26.94.

A stock often rises when added to an index because managers of index tracking funds add the shares to their portfolio.