Yum! plans to buy China's 'Little Sheep' chain
A sign shows Yum! Brands Inc's support center at its corporate headquarters in Louisville. Reuters

PhotoMedex, RF Micro Devices, Charles River Laboratories, Vera Bradley, Credit Suisse Group, Yum! Brands, Ceragon Networks, Lexmark International and Nokia Corp. are among the companies whose shares are moving in pre-market trading Thursday.

PhotoMedex, Inc. (PHMD) stock climbed 7.85 percent to $14.70 in pre-market trading. The company raised its fourth quarter revenue forecast to a range of $52 million to $54 million higher than previous estimation of $46 to $48 million.

RF Micro Devices, Inc. (RFMD) stock gained 2.50 percent to $4.51 in pre-market trading. The stock has a 52-week low of $3.45, a 52-week high of $5.69 and $1.23 billion in market capitalization.

Charles River Laboratories (CRL) stock gained 1.23 percent to $36.09 in pre-market trading. The stock tumbled more than 9 percent in regular trading Wednesday as its fiscal 2013 earnings guidance fell short of estimates. Currently, the company expects fiscal 2013 adjusted net profit to be in a range of $2.80 and $2.90 per share, below analysts' estimation of $3.02 per share.

Vera Bradley, Inc. (VRA) stock rose 1.41 percent to $24.48 in pre-market trading. The stock has a 52-week low of $18.91, a 52-week high of $39.48 and $979.17 million in market capitalization.

Credit Suisse Group AG (CS) stock gained 1.30 percent to $24.95 in pre-market trading. The stock has a 52-week low of $16.09, a 52-week high of $29.97 and $31.84 billion in market capitalization.

Yum! Brands, Inc. (YUM) stock advanced 1.27 percent to $68.50 in pre-market trading. The stock has a 52-week low of $57.09, a 52-week high of $74.75 and $30.56 billion in market capitalization.

Ceragon Networks Ltd. (CRNT) plunged 3.33 percent to $4.65 in pre-market trading. The stock has a 52-week low of $3.91, a 52-week high of $9.76 and $174.72 million in market capitalization.

Lexmark International Inc. (LXK) stock declined 2.03 percent to $24.57 in pre-market trading. The stock has a 52-week low of $16.10, a 52-week high of $38.34 and $1.62 billion in market capitalization.

Nokia Corp. (NOK) stock declined 1.04 percent to $3.79 in pre-market trading. The stock has a 52-week low of $1.63, a 52-week high of $5.87 and $14.34 billion in market capitalization.