Here are the companies that are making headlines before the bell:Advanced Micro Devices (AMD) – AMD slid 5.3% in the premarket after cutting its sales forecast. Levi Strauss (LEVI) – Levi Strauss took a 5.3% premarket hit after cutting its full-year sales and profit outlook. CVS Health (CVS) – CVS shares fell 5% in premarket trading, following a downgrade of one of its Aetna Medicare Advantage plans in annual ratings issued by the Centers for Medicare and Medicaid Services. Lyft (LYFT) – Lyft fell 2.6% in the premarket after RBC downgraded the ride-hailing service's stock to "sector perform" from "outperform." RBC said its driver supply analysis points to a less bullish outlook for Lyft and that competitor Uber (UBER) enjoys "structural advantages" over Lyft.

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