Check out which companies are making headlines after the bell Monday:
PetSmart will replace Sunoco in the S&P 500 effective after the market close on October 4. (Click here for after-hours quotes.)
Oracle - The tech giant's president, Mark Hurd, told CNBC that the company grew its software business by 11 percent during the quarter, with double-digit growth in the U.S. and Asia. He added that the company has been working on cloud applications for several years. Shares edged higher in extended-hours trading. (Click here for after-hours quote.)
(Read More: Stocks End Mixed; Google Hits All-Time High)
Google- The search engine giant closed at an all-time high Monday, topping Microsoft's market cap to become the second largest stock on the Nasdaq 100. (Click here for after-hours quotes.)
Fifth & Pacific - The parent company of Juicy Couture lowered its full-year guidance, sending shares sharply lower in extended-hours trading. (Click here for after-hours quote.)
Whiting Petroleum - SunTrust downgraded its rating on the oil and gas company to "neutral" from "buy." (Click here for after-hours quote.)
Pentair - The water-filtration company announced an additional $800 million share buyback plan. The company previously announced a $400 million authorization last Friday. (Click here for after-hours quote.)
First Republic Bank - Macquaire Research initiated coverage of the bank and wealth-management company with a "neutral" rating and a $35 price target. (Click here for after-hours quote.)
(Read More: CNBC's Market Insider Blog)
—By CNBC’s JeeYeon Park (Follow JeeYeon on Twitter: @JeeYeonParkCNBC)
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