Koch vs Yass

Koch, Inc. and Susquehanna International Group.

The differences

Forbes puts Jeff Yass about $0.9B ahead of Charles Koch.Forbes figures from 16 Sep 2026 and 14 Oct 2026.
Charles Koch: inherited and grew it. Jeff Yass: co-founded it.

Put someone else on either side

Koch

Yass

Net worth, Forbes: $76.9BForbes, 14 Oct 2026; $77.8BForbes, 16 Sep 2026
Net worth, Bloomberg: $70.5BBloomberg, 10 Oct 2026; $88.2BBloomberg, 10 Oct 2026
Forbes rank: No. 28Real-Time list, 14 Oct 2026; No. 30Real-Time list, 16 Aug 2026
Billionaire since: Not stated; 2021Forbes added him to the World's Billionaires list in April 2021 with $12 billion, after investigating his holdings

How it started: Inherited and grew itHis father Fred Koch started the family business in 1940; Charles joined in 1961, became chairman and CEO in 1967 and grew it into a diversified group; in 1983 he and his brother David bought out two siblings; Co-founded itCo-founded Susquehanna with a group of college friends in 1987
Main source: Koch, Inc. (Koch Industries), a private conglomerateForbes: pipelines, chemicals, software, automotive components and Dixie cups, some $125 billion in revenue; Susquehanna International Group, a proprietary trading firmBloomberg also credits him with a minority stake in ByteDance
Companies: Koch, Inc.Koch, Inc.: Chairman and co-CEO; Susquehanna International GroupSusquehanna International Group: Co-founder and managing director
Biggest stake: Koch, Inc.38% owned; Susquehanna International Group51% owned

Born: 1 Nov 1935Wichita, Kansas, United States; Year not statedNew York City, United States
Country: United StatesLives in Wichita, Kansas, United States; United StatesLives in Haverford, Pennsylvania, United States
Education: Graduate degreeBS in general engineering (1957), MS in nuclear engineering (1958) and MS in chemical engineering (1959), MIT; Bachelor's degreeBS, State University of New York at Binghamton
Parents: Father Fred C. Koch was an MIT-trained engineer who developed an oil-refining process and ran refining, engineering and ranching businesses; mother Mary's occupation not statedHis biography calls his upbringing 'comfortable'; Son of two accountantsForbes adds that his father Gerald later helped build Susquehanna's back-office bookkeeping

Giving Pledge: Not a signer; Not a signer
Foundation: Stand TogetherFounded in 2003 and the hub of his philanthropy; he also founded the Charles Koch Foundation; Yass Foundation for Education (Yass Prize)Janine and Jeff Yass founded the Yass Prize, run with the Center for Education Reform since 2021
Lifetime giving: $1.8BForbes, 10 Oct 2023. Forbes' estimate of lifetime giving, excluding amounts not yet distributed; Not stated

Role now: Runs the companyChairman and co-CEO of Koch, Inc.; Runs the companyCo-founder and managing director of Susquehanna International Group
Successor: None namedDave Robertson became co-CEO alongside him in 2023; his son Chase Koch is executive vice president for origination and partnerships; Not stated
Public office: None found; None found
Legal record: None found; 1982: Philadelphia Stock ExchangeSettled an exchange disciplinary matter over a position-limit violation (Rule 1001) with a $1,000 fine, listed as disclosure 1 of 5 on his FINRA BrokerCheck report.