A Personal Stake in Giving

Donor aims to 'lick' illness that he has battled for 15 years

Koch Industries is one of the largest privately held companies in the world, with more than $100-billion in revenue from operations in industries like oil, chemicals, and timber — but it is far from a household name.

"We're the largest company that you've never heard of," says David H. Koch, who owns 40 percent of the Wichita, Kan., business.

Koch Industries may fly under the radar, but it is becoming harder to miss Mr. Koch's philanthropy, which the company's

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