Take a look at some of Friday's midday movers:
Tesla - The electric-car maker continued to fall on news of a third fire in six weeks of one of its Model-S vehicles.
Homebuilders were taking a hit as a strong jobs report renewed thinking that interest rates would climb. Lennar, PulteGroup, KB Home , DR Horton and Toll Brothers all fell.
Utilities also declined on interest-rate concerns. Exelon, Consolidated Edison, Duke Energy and Edison International all fell.
Twitter fell on its second trading day after Hudson Square Research initiated coverage with a sell, and Pivotal Research downgraded shares of the short-messaging service to a sell from a buy rating on worries the stock had gotten too expensive.
Riverbed Technology rose after an affiliate of hedge fund Elliott Management disclosed a 5.8 percent take in the network-equipment maker and pushed for a strategic review.
Las Vegas Sands, MGM Resorts and Wynn Resorts all gained as Macau gambling revenues hit another record in October.
Cablevision Systems fell after the cable operator lost more video subscribers than expected in the third quarter and showed a surprise loss of broadband subscribers.
Deere fell as Bank of America/Merrill Lynch downgraded the stock to neutral from buy, saying falling corn prices could impact future sales of farming equipment.
Fairway Group Holdings rose, rebounding from a 22 percent slump on Thursday after posting weaker-than-expected quarterly results.
Snap-On rose after the maker of tool-and-diagnostic equipment increased its quarterly dividend 16 percent to 44 cents a share.
Horizon Pharma surged after the specialty drug company posted a narrower-than--expected quarterly loss on strong sales of an arthritis treatment.
Tremor Video fell after Jefferies and Canaccord Genuity downgraded the provider of online-video advertising to hold from buy after it reported lower-than-expected third-quarter results.
Universal Display surged after the LED supplier reported a surprise quarterly profit and better-than-expected revenue. It also forecast better-tha-expected full-year revenue.
Arena Pharmaceuticals gained after it said Japanese drug maker Eisai will sell its diet pill in most markets worldwide.
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—By CNBC's Rich Fisherman.
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