CHICAGO--(BUSINESS WIRE)--Fitch Ratings has affirmed NewMarket Corporation\'s (NewMarket) long-term Issuer Default Rating (IDR), revolving credit facility and senior unsecured notes ratings at \'BBB-\'. The Rating Outlook is Stable. KEY RATING DRIVERS The ratings reflect NewMarket\'s cash flow generation, position within a consolidated industry with high barriers to entry, and its relatively low leverage. Rating constraints include its smaller size, low industry growth, and shareholder friendly act
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