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William Koch is the son of the largest privately owned oil refining company in the United States. After leaving the Koch Industries founded by his father Fred Chase Koch, William Koch went on to establish and head the Oxbow Group, a Florida-based energy development holding company.

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Koch is known to be an avid collector of wines, arts, and maritime memorabilia. His collection of maritime memorabilia includes antique nautical instruments, model shops and paintings of seascapes and ships. Koch also owns a collection of military vehicles which include an M42 Duster Antiaircraft gun. William Koch has an estimated net worth of over $4.05 billion.

Earnings & Financial Data

Date

Category

Description

Amount

2018

Asset

Current value of William Koch's 15,000-square-foot Elk Mountain Lodge on 59 acres in Aspen's Castle Creek Valley

$90,000,000

2016

Earning Turned Donation

Money spent for the building of the Oxbridge Academy of the Palm Beaches

$75,000,000

2016

Sale of Asset

Estimated value of the Koch brother's wine collection in an auction that features some extraordinary lots, including six magnums of 1982 Pétrus

$12,750,000

2016

Sale of Asset

Sale of William Koch’s cellar

$22,000,000

2015

Asset

Purchase value of William Koch's `Blue Period' Picasso

$67,500,000

2015

Sale of Asset

Selling price of William Koch's old Florida-style mansion in Gulf Stream, a tiny beach resort town just south of Palm Beach

$3,400,000

2007

Asset

Purchase value of William Koch's famed Elk Mountain Lodge property in Aspen

$26,500,000

2007

Asset

Purchase value of William Koch's old Florida-style mansion in Gulf Stream, a tiny beach resort town just south of Palm Beach

$3,100,000

1983

Sale of Asset

Sale of William Koch's stake in Koch Industries to his brothers Charles and David

$470,000,000