Check out which companies are making headlines after the bell Monday:
Mylan Labs - The drugmaker reported fourth-quarter earnings of $1.05 a share, in line with expectations, on revenue of $2.08 billion, beating estimates for $2.07 billion. The stock fell more than 2 percent in after-hours trading.
Palo Alto Networks - The security-software maker beat estimates on the top and bottom lines. However, shares fell more than 1 percent after the announcement.
Salix Pharma - The pharmaceuticals firm reported a fourth-quarter loss of $2.61 a share of $13 million in revenue. The stock edged lower after the announcement. Shares of Valeant, which is in the process of acquiring Salix, fell modestly.
Caesars Entertainment - Shares declined about 2 percent after the casino operator posted fourth-quarter loss of $7 a share on $2.13 billion in revenue.
Intrexon - Shares of the synthetic biology firm rose more than 3 percent after it reported fourth-quarter revenue of $31.1 million, an increase of some 335 percent from the year-earlier period.