Charles and David Koch are worth about $100 billion combined, according to the Bloomberg Billionaires Index. Through 1888, they are reportedly looking to make direct investments in companies.

Billionaires Charles and David Koch have opened a new family office called 1888 Management to manage part of their personal wealth, Bloomberg reported.

It is not known how much 1888 is managing, with regulatory filings showing less than $100 million in publicly-traded stocks, while a person familiar with 1888 put the current figure at over $2 billion.

Originally operated out of the treasury division of Koch Industries, 1888 incorporated in Delaware in 2014 and has since registered to do business in California, Florida and the family's base of Kansas, the report said.

Citing a filing in Florida last year, it added that the Koch’s family office has seven managers on its board, including three executives at Koch Industries: controller Richard Dinkel, chief financial officer Steven Feilmeier and treasurer David May, as well as other family members.

1888 Management has been contacted to comment on the story.