Billionaire collector William “Bill” Koch is ready to sell more of his art. After parting ways with $84 million worth of American art at Christie’s in January, he’s putting another group of paintings up for sale this November, including works by Claude Monet and Paul Cézanne that could fetch as much as $18 million apiece.

Christie’s said the collection, which also includes works by Edgar Degas, Henri Matisse, Joan Miró, and Diego Rivera, is expected to bring more than $40 million during its marquee sales in New York next month.

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The announcement marks the latest chapter in what has become a very lucrative relationship between Koch and the auction house. In June 2025, Christie’s sold $28.8 million worth of wine from his cellar , followed by his Western American art auction seven months later. Both sales exceeded expectations, according to Christie’s.

And it isn’t just art and wine that Koch has been selling.…