Citadel Securities vs Alpaca
Side-by-side comparison of AI visibility scores, market position, and capabilities
Citadel Securities is one of the world's largest market makers, executing ~25% of US equity volume daily; received a $1.15B investment from Sequoia and Paradigm in 2022 at a $22B valuation;
About
Citadel Securities is a leading global market maker and financial services firm founded by Kenneth Griffin and headquartered in Miami, Florida. The company is distinct from the Citadel hedge fund — Citadel Securities operates as a separate entity focused on providing liquidity and executing trades for retail brokers, institutional investors, banks, and exchanges across equities, fixed income, options, and currencies. As a market maker, Citadel Securities continuously quotes bid and ask prices across thousands of securities, enabling fast and efficient trade execution for market participants at scale.
Alpaca is a self-clearing broker-dealer and global leader in brokerage infrastructure APIs for stocks, ETFs, options, and fixed income; raised $52M Series C in April 2025 totaling $170M;
About
Alpaca is a developer-first brokerage infrastructure company founded in 2015 and headquartered in San Mateo, California. It operates as a fully self-clearing broker-dealer with DTCC, Nasdaq, OCC, and FICC memberships — enabling it to provide end-to-end brokerage infrastructure for stocks, ETFs, options, fixed income, and cryptocurrency without requiring partners to manage their own clearing relationships. Alpaca's Broker API allows fintech companies, neobrokerages, robo-advisors, and wealth management platforms to embed multi-asset trading into their applications with a single integration.
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