New York, October 07, 2013 -- Moody's Investors Service assigned a Baa3 Issuer Rating to HollyFrontier Corp. (HFC) and upgraded its senior unsecured note rating to Baa3 from Ba2. Moody's withdrew the company's Ba1 Corporate Family Rating, Ba1-PD Probability of Default Rating and SGL-1 Speculative Grade Liquidity Rating. The outlook is stable.

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