| 5/21/2013 | BKHYIG | S&P upgrades HollyFrontier
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| 7/12/2011 | BK | Moody's ups HollyFrontier
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| 7/6/2011 | BKHY | S&P ups HollyFrontier, Frontier Oil
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| 5/24/2011 | BKHY | S&P: Holly, Frontier Oil remain on positive watch
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| 2/24/2011 | BKHY | S&P: Holly, Frontier on positive watch
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| 2/23/2011 | BKHY | Moody's may up Holly, Frontier
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| 2/22/2011 | BKHY | Holly to combine with Frontier Oil in all-stock merger of equals
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| 11/9/2010 | BKHY | S&P rates Frontier Oil notes BB
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| 11/9/2010 | BKHY | Moody's rates Frontier Oil notes Ba3
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| 9/9/2008 | BKHY | Moody's assigns Frontier Oil notes Ba3
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| 9/8/2008 | BKHY | S&P assigns Frontier Oil notes BB
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| 9/4/2008 | BKHY | S&P ups Frontier Oil
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| 6/30/2008 | BKHY | S&P: Frontier Oil on positive watch
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| 6/24/2008 | BK | Frontier Oil amends revolver, lifting size, providing for possible price increase
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| 10/4/2007 | BK | Frontier Oil amends, restates loan, lifting amount, extending term
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| 9/25/2006 | BKCVHY | Moody's introduces new ratings
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| 7/19/2005 | BKHY | Fitch ups Frontier Oil
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| 11/23/2004 | BK | Frontier Oil gets $225 million amended and restated revolver
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| 9/21/2004 | BKHY | Fitch: Frontier Oil positive
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| 9/21/2004 | BKHY | Moody's rates Frontier Oil notes B1
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| 9/20/2004 | BKHY | S&P: Frontier Oil unaffected
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| 1/21/2004 | BKHY | S&P: Frontier Oil unaffected by refinery fire
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| 11/20/2003 | BKHY | S&P: No affect on Frontier Oil credit from redemption
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| 8/22/2003 | BKHY | Moody's cuts Collins & Aikman
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| 8/21/2003 | BKHY | Moody's cuts Marsh Supermarkets
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| 8/1/2003 | BKHY | S&P puts Associated Materials on watch
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| 7/10/2003 | BKHY | S&P cuts Tenet to junk
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| 5/29/2003 | BK | Frontier Oil obtains $175 million revolver
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| 5/19/2003 | BKHY | Moody's rates Province notes B3
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| 4/1/2003 | BKHY | S&P rates Allied Waste notes BB-, bank loan BB, convertibles B
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| 3/31/2003 | BKHY | S&P puts Frontier Oil on positive watch
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| 8/20/2002 | BK | S&P cuts Charter two notches
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