Griffin vs Yanai

Citadel and Fast Retailing (Uniqlo).

The differences

Forbes puts Ken Griffin about $2.3B ahead of Tadashi Yanai.Forbes figures from 7 Oct 2026 and 27 Mar 2026.
Ken Griffin: founded it. Tadashi Yanai: inherited and grew it.
Tadashi Yanai is about 19 years older than Ken Griffin.
Ken Griffin is from United States; Tadashi Yanai is from Japan.

Put someone else on either side

Griffin

Yanai

Net worth, Forbes: $57.4BForbes, 7 Oct 2026; $55.1BForbes, 27 Mar 2026
Net worth, Bloomberg: $57.5BBloomberg, 13 Oct 2026; $69.5BBloomberg, 16 Oct 2026
Forbes rank: No. 33Real-Time list, 30 Sep 2026; No. 33Real-Time list, 27 Mar 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; Inherited and grew itHis father Hitoshi Yanai founded the men's shop Ogori Shoji in 1949; Tadashi joined in 1972, became president in 1984, opened the first Uniqlo that year and built it into Fast Retailing. The company calls him its founder and Forbes lists him as self-made
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'; Fast Retailing shares (Uniqlo)Bloomberg: 'The majority of Tadashi Yanai's fortune is derived from his stake in Fast Retailing'
Companies: Citadel, Citadel SecuritiesCitadel: Founder, CEO and co-chief investment officer; Citadel Securities: Founder and non-executive chairman; Fast Retailing (Uniqlo)Fast Retailing (Uniqlo): Chairman, president and CEO
Biggest stake: Citadel85% owned; Fast Retailing (Uniqlo)18.96% owned

Born: 15 Oct 1968Florida, United States; 7 Feb 1949Yamaguchi Prefecture, 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 political science and economics, Waseda University (1971)
Parents: Father was a General Electric engineer on the space program; mother studied childhood education; his grandmother paid his Harvard tuition from her savings; His father founded and ran a men's clothing shop in Ube, Yamaguchi PrefectureMother's occupation not stated

Giving Pledge: Not a signer; Not a signer
Foundation: Griffin CatalystHis civic engagement and philanthropy initiative; Yanai Tadashi FoundationFounded 2015 (scholarships); he also chairs the Fast Retailing Foundation
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, president and CEO of Fast Retailing; chairman of UNIQLO
Successor: None namedCitadel's leadership page lists Pablo Salame as co-CIO; no CEO successor and no family members in executive roles; None namedHe is expected to be reappointed chairman, president and CEO after the 26 November 2026 shareholder meeting. Kazumi Yanai and Koji Yanai are group senior executive officers and directors; Bloomberg says shares held by his two sons are credited to him
Public office: None found; None found
Legal record: None found; None found