Connect to Citadel Securities with ZagTrader

Who is Citadel Securities?

Citadel Securities is a global market maker and liquidity provider that quotes continuous two-sided prices across a broad range of asset classes. It is one of the most active participants in many of the world's markets, supplying liquidity to institutional clients, broker-dealers, and trading venues. Its business is electronic trading and market making at scale, with the firm acting as principal to provide pricing and execution rather than advisory or banking services.

It is important to distinguish Citadel Securities from Citadel, the alternative investment manager. The two are separate firms: Citadel is a hedge fund and asset manager, while Citadel Securities is a market-making and liquidity business. For execution desks, the relevant counterparty is Citadel Securities — a frequent destination for order flow seeking competitive, automated pricing. Reaching that counterparty through a stable, certified, and well-monitored connection is a practical requirement for any desk that routes orders to it, and that is the role ZagTrader is built to fill.

How ZagTrader connects and routes to Citadel Securities

ZagTrader provides institutional connectivity to Citadel Securities through certified FIX sessions, established and tested so that order flow, executions, and acknowledgements travel over resilient, monitored links. The same connectivity supports direct market access (DMA) workflows, allowing desks to send orders to Citadel Securities for execution while retaining full control and visibility on the trading blotter.

Connectivity is delivered as part of ZagTrader's integrated Order Management System (OMS) and Execution Management System (EMS). Traders work from a unified blotter, apply pre-trade compliance and risk checks, and use smart order routing logic to direct orders appropriately before they leave the desk. Drop-copy sessions provide an independent, real-time stream of execution and order-status messages for reconciliation, surveillance, and risk monitoring. Because order management, execution, routing, and post-trade share one platform, there are no brittle hand-offs between disconnected systems.

• Certified FIX sessions for order entry, execution reports, and acknowledgements.
• Direct market access (DMA) order flow with full blotter visibility.
• Smart order routing managed within the OMS/EMS before orders are sent.
• Drop-copy sessions for independent reconciliation and surveillance.
• Pre-trade compliance and risk checks applied before orders leave the desk.

Liquidity and markets accessible through Citadel Securities

As a global market maker, Citadel Securities provides liquidity across a wide range of asset classes through automated, continuous pricing. Routing to it via ZagTrader's multi-asset platform lets a desk tap that liquidity from a single, consistent workflow rather than maintaining separate tools per product line. The instruments and services available always depend on a client's own agreements and onboarding with the firm.

• Equities — quoted liquidity in cash equities across global markets.
• Options — listed equity and index options pricing.
• ETFs — execution and liquidity in exchange-traded funds.
• Fixed income — liquidity across selected debt instruments.
• Currencies — foreign-exchange pricing for institutional flow.
• Other listed products available under the relevant client agreements.

Post-trade, settlement, and reporting

Execution is only the first step in the trade lifecycle, and ZagTrader is built to carry flow routed to Citadel Securities all the way through to booking. Fills captured over FIX and confirmed via drop-copy feed straight into the platform's post-trade processing, so that trades, allocations, and positions are kept consistent without manual re-keying.

The platform supports trade confirmation and allocation, generation of settlement instructions, and reconciliation against counterparty, custodian, and clearing records. Settlement itself takes place through the relevant market infrastructure and the client's own custody and clearing arrangements; ZagTrader's role is to manage the order and post-trade data flow accurately around that process. Reporting and audit-ready record keeping are produced from the same source of truth that runs from order inception, helping desks meet their internal control and regulatory obligations across the jurisdictions in which they operate.

Why route to Citadel Securities through ZagTrader

Routing to Citadel Securities through ZagTrader means consolidating execution, routing, risk, compliance, and post-trade onto one multi-asset front-to-back platform instead of stitching together separate systems for each function. A single OMS/EMS blotter spans Citadel Securities alongside other supported liquidity providers, brokers, and venues, so traders manage their full book in one place and operations work from one consistent set of records.

Certified FIX connectivity and drop-copy reconciliation give desks confidence that what was sent, executed, and booked all agree, while smart order routing and pre-trade controls keep execution disciplined. As needs grow, the same platform scales to additional counterparties, asset classes, and markets without re-platforming, making ZagTrader a durable foundation for desks that route institutional flow to Citadel Securities and beyond.

• One multi-asset OMS/EMS for Citadel Securities and additional liquidity providers and venues.
• Certified FIX and DMA connectivity with drop-copy reconciliation.
• Smart order routing and pre-trade compliance and risk controls.
• Integrated post-trade flow from execution through booking and reporting.
• Scales to more counterparties, asset classes, and markets without re-platforming.