Ken Griffin

Chief Executive Officer and Co-Chief Investment Officer, Citadel

Ken Griffin founded the hedge fund Citadel in 1990 and is its chief executive and co-chief investment officer; he also founded and owns the market maker Citadel Securities.

Funds

The funds Ken Griffin runs, and what each reported holding in its latest 13F filing with the SEC.

Citadel$875.01BChief Executive Officer and Co-Chief Investment Officer13,572 positions · 13F as of Jun 30, 2026Largest positionsState Str SPDR S&P 500 ETF TCALL4.1%Invesco Qqq TrPUT3.0%Invesco Qqq TrCALL2.7%See the portfolio →

Net worth: $57.2B; #33 in the world · Forbes, 31 October 2026

Snapshot

Known for

Founding Citadel and Citadel Securities

Worth knowing

Citadel Advisors' Form ADV lists him as Chief Executive Officer and Co-Chief Investment Officer, the title the fund page uses.
About 80% of the value in Citadel Advisors' 13F report for the quarter to June 30, 2026 is options (puts and calls at the value of the underlying shares), so the $875 billion total is not assets under management; Wikipedia puts Citadel's assets at about $67–77 billion in early 2026.
Forbes ranks him #20 on its 2026 Forbes 400 list.

Age: 58
Based: Miami, Florida
Primary role: Founder, CEO, & Co-Chief Investment Officer, Citadel
Citizenship: United States
Born: 1968, Daytona Beach, Florida
Company: Citadel (CEO, co-CIO); Citadel Securities (founder)

Latest on Ken Griffin

Featured · Power

First Solar sues JA Solar and Corning's Phoenix plant over a patent China's patent office invalidated

JA Solar and the Corning subsidiary running a 2 GW assembly plant in Phoenix are the latest targets of a patent that runs to 2030. Truist sees the stock, down 32% this year, at $270.

October 15, 2026 · 3 min read

Economy
Goldman's biggest prime-broker client of 2026 was a two-year-old AI fund running four-times leverage
Goldman collected more than $200 million in fees from Leopold Aschenbrenner's two-year-old fund this year, more than from any other prime-brokerage client, per the FT. That client no longer borrows, and the fee machine it ran on has stopped.
September 28, 2026 · 3 min read

Ken Griffin

Funds

Snapshot

Latest on Ken Griffin

First Solar sues JA Solar and Corning's Phoenix plant over a patent China's patent office invalidated

Goldman's biggest prime-broker client of 2026 was a two-year-old AI fund running four-times leverage

Connections

In the same stories

Ties, as Forbes lists them

Either side by net worth

Funds

Snapshot

Latest on Ken Griffin

First Solar sues JA Solar and Corning's Phoenix plant over a patent China's patent office invalidated

Goldman's biggest prime-broker client of 2026 was a two-year-old AI fund running four-times leverage

Connections

In the same stories

Ties, as Forbes lists them

Either side by net worth