Mr. Koch, whose net worth of about $50.5 bil­lion tied him with his brother as the world’s 11th-rich­est per­son in Forbes mag­a­zine rank­ings, gained most of his wealth from a 42% stake in Wi­chita, Kan.-based Koch In­dus­tries, which has in­ter­ests rang­ing from oil to beef to pa­per and is the sec­ond-largest closely held U.S. com­pany.

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