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Alleghany could refer to:
Allegheny Energy (AYE), an electric utilities company that owns and operates electric generation facilities and delivers electric services to customers in Pennsylvania, West Virginia, Maryland and Virginia, which received an acquisition offer from FirstEnergy on Feb 11, 2010.
Allegheny Technologies (ATI), a specialty metals company that makes alloys designed to have special properties such as hardness, toughness, resistance to heat and resistance to corrosion.
Alleghany (Y), an investment holding company that has traditionally invested in financial services firms.
