Citadel LLC

What does Citadel own?

Citadel manages capital for institutional clients across five investment strategies. It does not own a portfolio of operating brands; its business is investment management conducted under the single Citadel identity.

Is Citadel publicly traded?

No. Citadel LLC is privately held, approximately 85 percent owned by Ken Griffin. It has never issued public shares, though Sequoia Capital and Paradigm hold a minority stake purchased in 2022.

Who founded Citadel?

Ken Griffin founded Citadel in 1990 in Chicago as Wellington Financial Group at age 22, after trading from his Harvard dorm room and managing capital for investor Frank Meyer.

Where is Citadel headquartered?

Citadel is headquartered at 830 Brickell Plaza in Miami, Florida, a tower it developed and anchors. It moved there from Chicago in 2022 and operates offices across the Americas, Europe, the Middle East, and Asia.

How many brands does Citadel own?

Citadel operates essentially one brand. Its investment business runs under the Citadel name, with Wellington as its flagship fund name. Citadel Securities is a separate company founded and majority owned by Griffin but not part of Citadel LLC.

Who owns Citadel?

Ken Griffin owns approximately 85 percent of Citadel LLC. The remainder is held by firm partners and minority investors Sequoia Capital and Paradigm. It is the most profitable hedge fund in history with $90.4 billion in cumulative net gains.

What is the difference between Citadel and Citadel Securities?

They are separate companies both founded and majority owned by Ken Griffin. Citadel LLC is the hedge fund. Citadel Securities is a market maker that executes stock and bond orders for brokers and institutions and does not manage outside investment capital.

Ken Griffin founded the firm in 1990 in Chicago as Wellington Financial Group, after trading convertible bonds from his Harvard dorm room and managing capital for Chicago investor Frank Meyer. He was 22 years old. The firm renamed itself Citadel Investment Group in 1994 and built its early franchise in convertible bond and fixed income arbitrage.

The 1990s established the firm's basic pattern: steady growth, avoidance of the era's blowups, and an appetite for distressed opportunities. When Long-Term Capital Management collapsed in 1998, Citadel was among the firms that studied acquiring its positions. The approach set the template for later opportunistic expansions.

The 2000s transformed Citadel into a multistrategy firm. It added equities, commodities, and quantitative trading, building the centralized risk infrastructure that became its structural advantage. The signature event was the 2006 absorption of Amaranth Advisors' energy book after that fund's collapse, a profitable rescue that cemented Citadel's commodities business and its reputation as the industry buyer of distressed portfolios.

The 2008 financial crisis was the firm's near-death experience. Its flagship funds lost roughly 55 percent at the trough, and Griffin temporarily suspended investor redemptions while rebuilding. Citadel recovered fully over the following years, repaying investors who stayed and ultimately producing the strongest period in its history.

In 2013 the firm simplified its name to Citadel LLC. The 2020 to 2022 period produced its best performance: the Wellington flagship returned roughly 24 percent in 2020 and a record 38 percent in 2022. In June 2022 Griffin moved the headquarters to Miami, and in January 2025 LCH Investments ranked Citadel the most profitable hedge fund manager ever, with net gains reaching $90.4 billion by December 2025. The firm returned approximately $5 billion to investors at the start of 2026.

Citadel's corporate posture is defined by meritocratic intensity rather than ESG programming: it recruits aggressively, pays at the top of the market, and runs a famously demanding culture. Its offices and hiring practices are described in industry reporting rather than independent certification frameworks. The firm operates under the regulatory obligations of a large SEC-registered investment adviser across the jurisdictions where it trades.

Citadel has faced several documented regulatory matters. In 2007 the SEC charged its Citadel Global Equities unit with violations in trading restricted securities, which it settled for $2 million. In 2023 the firm paid $7 million to settle SEC charges that it mismarked millions of short sale orders over five years, a case the SEC characterized as a major recordkeeping failure.

The firm's scale places it at the center of structural debates about hedge fund concentration, leverage, and systemic risk, particularly in the Treasury and equity markets where its footprint is large. Griffin's political spending and his public criticism of Chicago before the Miami move have generated recurring media controversy, as has the separate but conflated public anger directed at Citadel Securities during the 2021 meme stock episode.