Griffin vs Son

Citadel and SoftBank Group.

The differences

Forbes puts Masayoshi Son about $3B ahead of Ken Griffin.Forbes figures from 9 Oct 2026 and 7 Oct 2026.
Both started the company their money comes from.
Masayoshi Son is about 11 years older than Ken Griffin.
Ken Griffin is from United States; Masayoshi Son is from Japan.

Put someone else on either side

Griffin

Son

Net worth, Forbes: $57.4BForbes, 7 Oct 2026; $60.4BForbes, 9 Oct 2026
Net worth, Bloomberg: $57.5BBloomberg, 13 Oct 2026; $41.3BBloomberg, 16 Oct 2026
Forbes rank: No. 33Real-Time list, 30 Sep 2026; No. 31Real-Time list, 9 Oct 2026
Billionaire since: Not stated; Not stated

How it started: Founded itFounded Citadel in 1990, a year after graduating; established Citadel Securities with partners in 2002; Founded itFounded Nihon SoftBank (now SoftBank Group) in 1981
Main source: Citadel hedge fund business and Citadel SecuritiesBloomberg: 'The bulk of Ken Griffin's fortune is derived from the money he's made managing Citadel Advisors'; SoftBank Group stockBloomberg: most of his wealth comes from his SoftBank Group stake
Companies: Citadel, Citadel SecuritiesCitadel: Founder, CEO and co-chief investment officer; Citadel Securities: Founder and non-executive chairman; SoftBank Group, ArmSoftBank Group: Founder; representative director, corporate officer, chairman and CEO; Arm: Non-executive director and chairman
Biggest stake: Citadel85% owned; SoftBank Group32.73% owned

Born: 15 Oct 1968Florida, United States; 11 Aug 1957Tosu, Japan
Country: United StatesLives in Miami, Florida, United States; JapanLives in Tokyo, Japan
Education: Bachelor's degreeAB with honors in economics, Harvard College (1989); Bachelor's degreeBachelor's degree in economics, University of California, Berkeley
Parents: Father was a General Electric engineer on the space program; mother studied childhood education; his grandmother paid his Harvard tuition from her savings; Born to a Korean immigrant family; his father worked at fisheries, farms, restaurants and pachinko parlours

Giving Pledge: Not a signer; Not a signer
Foundation: Griffin CatalystHis civic engagement and philanthropy initiative; Masason FoundationEstablished December 2016 to support talented young people; he is its president
Lifetime giving: $2.5BForbes, 9 Feb 2026. Forbes' lifetime giving estimate; Griffin Catalyst says he has donated more than $5.7 billion; Not stated

Role now: Runs the companyFounder, CEO and co-CIO of Citadel; founder and non-executive chairman of Citadel Securities; Runs the companyChairman and CEO of SoftBank Group; chairman of Arm
Successor: None namedCitadel's leadership page lists Pablo Salame as co-CIO; no CEO successor and no family members in executive roles; Not stated
Public office: None found; None found
Legal record: None found; None found