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Scott Mlyn | CNBC

Check out which companies are making headlines ahead of the bell Monday:

Boston Scientific - The supplier of medical equipment rose in pre-market trading after JPMorgan upgraded its shares to "overweight" from "neutral."

Buffalo Wild Wings - The franchise operator slipped in pre-market trading after RW Baird downgraded its shares to "neutral" from "outperform."

Cablevision Systems - The cable-television operator fell in pre-market trading after JPMorgan downgraded its shares to "underweight" from "neutral."

Caterpillar - The equipment maker declined in the pre-market trading after JPMorgan downgraded its shares to "underweight" from "neutral."

Cempra - The antibiotic developer rallied ahead of the bell after saying its treatment for a common type of pneumonia performed well in a late-stage clinical test.

Coca-Cola - Morgan Stanley upgraded the beverage company to "overweight" from "equal weight."

Domino's Pizza - Janney Montgomery Scott upgraded shares of the pizza chain to "buy" from "neutral."

El Pollo Loco Holdings - The operator of quick-service restaurants rose in pre-market trading after RW Baird upgraded its shares to "outperform" from "neutral."

Halliburton - The energy company and others including Exxon Mobil and Chevron fell with the price of oil.

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Intel - MKM Partners upgraded shares of the chip manufacturer to "buy" from "neutral."

Merck & Co - The pharmaceutical company gained in early trading after Bernstein & Co. upgraded its shares to "outperform" from "market perform."

Potbelly - The operator of sandwich shops gained in pre-market trading after RW Baird upgraded its shares to "outperform" from "neutral."

Wells Fargo - RW Baird downgraded shares of the bank to "neutral" from "outperform."

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