CITADEL Securities

Introduction

In the modern, fast-paced business model of global financial markets, the most important qualities are market liquidity and efficient execution capabilities. Citadel Securities is among the entities that provide this liquidity by connecting buyers and sellers in the financial marketplace.

Citadel Securities is a wholly owned subsidiary of Citadel LLC. Citadel was established by Kenneth C. Griffin in 1990 with $4.6 million in personal funds, raised through private investment by others and through his own investment of funds he made from trading from his dorm room at Harvard University in 1987.

From those early beginnings to the present day, Citadel has become an extremely successful, well-respected, and highly effective provider of liquidity in the marketplace through its unique combination of modern technology, operational expertise, and its financial commitment to market-making. Citadel LLC is a Miami-based investment firm with $65 billion+ in assets under management as of early 2025, while Citadel Securities is a separate but affiliated entity with a large presence located within Chicago, IL, as well as offices in New York City, San Francisco, London, and Hong Kong. This office location diversity helps support Citadel Securities' worldwide market-making activities and its institutional client base.

While Citadel LLC also manages multi-strategy hedge funds, Citadel Securities specializes in providing liquidity for U.S. equities, options, and ETFs. However, both companies share the same ownership and management under Ken Griffin, with a focus on technological excellence and leading positions in their respective markets.

Primary Features & Offers

Liquidity From Market Making

Citadel Securities operates primarily as a market maker, a function in which it buys and sells various assets, such as stocks, options, ETFs, and other securities, continuously throughout the trading day to provide liquidity to its clients and promote efficient price discovery. This is done by providing a narrow bid-offer spread and speedy order execution.

Multi-Strategy Hedge Fund Management

Although Citadel Securities primarily acts as a market maker, Citadel LLC operates as the multi-strategy hedge fund manager of Citadel's family of funds. Using quantitative models and algorithms, Citadel LLC invests across many asset classes (stocks, bonds, commodities, etc.). This diversification allows Citadel LLC to fully exploit many market opportunities while managing risk efficiently.

Technology Leadership

Citadel Securities has established itself as a leader in its use of leading-edge technology. By leveraging advanced data analytics, machine learning, and high-frequency trading to execute trades quickly and in large volumes, Citadel Securities has an advantage in speed and execution quality, which in turn provides sufficient liquidity and a very tight spread across both domestic and foreign electronic marketplaces.

Uniform Client Base

Citadel Securities provides liquidity and execution services primarily to institutions and retail brokers. Citadel Securities does not provide retail brokerage services directly, but through its market-making activities, it has enhanced the trading environment for retail investors by improving marketplace quality.

Compliance & Regulation

Citadel Securities must comply with all applicable legal, regulatory, and compliance requirements within the marketplace in which it operates. Citadel Securities operates under both the U.S. Federal Government and global regulations within each country where it has offices; therefore, no specific numbers for these licenses are publicly available.

Trading Conditions and Platform Technology

Trading Conditions

Citadel Securities is a market-making firm, rather than a retail broker, and does not provide retail investors with trading conditions such as spreads, leverage, or minimum deposits. Whereas retail brokers typically work with individuals through these conditions, Citadel Securities works with both institutional traders and retail traders via liquidity provided through tight bid-ask spreads and fast execution times. By improving the liquidity quality in the marketplace, Citadel Securities indirectly benefits both types of traders.

Platform Technology

To facilitate this process, Citadel Securities has created proprietary high-frequency trading platforms. These proprietary platforms have been designed to deliver high-speed performance, reliability, and accuracy for traders. The platforms incorporate data analytics and machine learning algorithms that help improve execution performance and risk management. Unlike retail brokers, Citadel Securities does not offer a publicly accessible trading platform or mobile applications. Instead, capitalizing on its market position, Citadel Securities prioritizes building institutional-grade infrastructure.

Fee Structure

Citadel Securities and Citadel LLC operate under business models distinct from retail brokers, and as such, traditional retail fees like deposit, withdrawal, or inactivity fees do not apply. Instead, their fee structures align with institutional market-making and hedge fund practices.

Citadel LLC’s hedge fund fees typically include management and performance fees, commonly structured as 2% of assets under management and 20% of profits, though exact details remain proprietary. Citadel Securities, as a market maker, does not charge commissions or fees directly to retail traders but earns revenue through bid-ask spreads and trading volume.

User Experience and Market Reputation

Since retail investors do not directly deal with Citadel Securities, it does not have the types of customer reviews or ratings typically found on a retail broker’s website. However, within the industry, Citadel Securities has a stellar reputation as a leader in market-making, an innovator in technology, and a provider of high-quality executions.

Citadel Securities is regarded positively by Wall Street professionals for providing deep liquidity and offering tight spreads, both of which contribute to greater market efficiency. Additionally, Citadel Securities is perceived as well-managed in terms of risk and as committed to regulatory compliance.

• Pros: Market leader, sophisticated technology, strong risk management
• Cons: Retail investors do not have direct access; strictly an institutional broker

Recent Developments

As of early 2025, Citadel LLC had over $65 billion in assets under management, and it has continued to grow. Citadel Securities remains one of the largest providers of market-making services for equities and options in the United States. Citadel Securities accounts for a large part of the daily trade volume.

Citadel Securities has reaffirmed its commitment to security and compliance by appointing leadership roles focused on both. Therefore, there have been no significant changes to how trades are executed or how they charge for their services recently. As such, Citadel Securities will continue with its stable institutional brokerage model.

Conclusion

Citadel Securities serves as the foundation of the modern financial marketplace through its sophisticated methods for providing safe liquidity and executing trades efficiently. Citadel Securities will continue to evolve as part of the Citadel family of enterprises, led by Kenneth C. Griffin, to develop technological products that improve global market liquidity through innovative ideas and robust market knowledge.

Retail customers will not have direct access to Citadel Securities. Still, the effects of having Citadel Securities provide liquidity to the markets will be felt by all participants in the ecosystem, enabling the smooth functioning of equity and options markets. Citadel Securities will continue to play an essential role in the evolution of electronic trading and market liquidity.