Take a look at some of Monday's midday movers:
Chimerix - Shares gained ground after the FDA approved the company's drug to treat Ebola patients.
H&R Block - The tax-preparation provider fell on word the sale of its banking unit to Bank of Internet (BOFI) would be delayed.
Intuitive Surgical The maker of surgical-robot devices rose after Goldman Sachs upgraded it to buy from neutral.
McDonald's - The fast-food chain moved lower after Morgan Stanley downgraded the stock to equal weight from overweight and lowered its price target to $96 from $102. It was more bullish on Burger King (BKW) instead.
Rio Tinto - The miner spiked on a report that Glencore was laying the groundwork for a possible merger between the two in 2015. Freeport-McMoRan, BHP Billiton and Cliffs Natural Resources all initially rose on the news.
Sunesis Pharmaceuticals - The company plunged after it said its experimental cancer drug did not meet its goals in a late-stage trial.
Tesla Motors - The electric-car maker moved higher on reports it was making its first move toward automated driving.
Walt Disney - the entertainment conglomerate rose as its ESPN sports channel signed a nine-year deal with the NBA, starting with the 2016-17 season.
Wynn Resorts - The casino operator and others including Las Vegas Sands, MGM Resorts and Melco Crown all moved higher after Macau reported a 14 percent year-on-year rise in visitor arrivals during China's National Day Golden Week in the beginning of October.
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