Check out which companies are making headlines after the bell Monday:
Jamba Juice - The beverage company lowered its fiscal year 2013 guidance for same-store sales and profit margins, citing bad weather in key markets and constraints on consumer spending. Shares dropped sharply in extended-hours trading.
Talisman Energy - Billionaire investor Carl Icahn disclosed a 61 million share stake in the oil and gas exploration company, according to his Tweet, adding he "may have conversations" with the management regarding strategic alternatives and board seats. Shares spiked higher in extended-hours trading.
Generac - The backup power generation product manufacturer said it will acquire Baldor Electric's generator business, but financial details of the deal were not immediately disclosed. The acquisition is expected to close in the fourth quarter of 2013. Shares were flat in extended-hours trading.