Algorithmic trading / Wikipedia

Top 10 US Algorithmic Trading Firms

US algorithmic and quantitative trading firms now account for over 70% of daily US equity market volume. These firms deploy sophisticated mathematical models, machine learning, and ultra-low-latency infrastructure to execute millions of trades per second across global markets.

Location: United States2026272 viewsPublished Mar 25, 2026 Updated Oct 3, 2026

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#1
Renaissance Technologies
Renaissance Technologies' Medallion Fund averaged +66% annual returns before fees from 1988 to 2018 — the greatest investing track record in history. Founded by mathematician Jim Simons in 1982, Renaissance manages approximately $60 billion across all funds. The fund employs over 300 PhD scientists and is closed to outside investors.
SourcesSEC EDGAR: Renaissance Technologies 13F Filing Bloomberg: Inside Renaissance Technologies - The World's Greatest Hedge Fund Renaissance Technologies: Official Website
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source: wikipedia
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#2
Citadel Securities
Citadel Securities generated $26 billion in revenue in 2022 and executes approximately 30% of all US equity trading volume, making it the dominant US market maker. Founded by Ken Griffin in 2002, it provides liquidity across stocks, options, ETFs, and fixed income. Citadel Securities handles retail orders for major brokerages including Robinhood and Schwab.
SourcesFINRA: Understanding Market Makers and Their Role Bloomberg: How Citadel Securities Became the Dominant US Market Maker Citadel Securities: Official Website
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source: wikipedia
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#3
Two Sigma
Two Sigma manages approximately $60 billion in AUM with 2,700 employees, nearly all of whom are engineers, mathematicians, or data scientists. Founded in 2001 by David Siegel and John Overdeck, it applies machine learning and distributed computing to find patterns in vast datasets. Two Sigma has expanded into venture capital and private equity alongside its core hedge fund business.
SourcesSEC EDGAR: Two Sigma 13F Filings Bloomberg: Two Sigma - Where Data Science Meets Wall Street Two Sigma: Official Website
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source: wikipedia
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#4
D.E. Shaw
D.E. Shaw was founded in 1988 by computer scientist David Shaw and manages over $60 billion across quantitative and discretionary strategies. It was one of the first firms to use computational algorithms in trading and employed Amazon founder Jeff Bezos before he launched Amazon in 1994. The firm's flagship Composite Fund has compounded at over 20% annually since inception.
SourcesSEC EDGAR: D.E. Shaw 13F Filings Bloomberg: D.E. Shaw - The Hedge Fund That Spawned Amazon D.E. Shaw Group: Official Website
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source: wikipedia
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#5
Virtu Financial
Virtu Financial posted $2.9 billion in revenue in 2022, making it the most profitable market maker on this list. Its ultra-low-latency infrastructure processes billions of trades daily across 235 venues in 50 countries, and the firm famously disclosed only one losing trading day in over five years before its 2015 IPO.
SourcesSEC EDGAR: Virtu Financial Annual 10-K Filing Bloomberg: Virtu Financial - Profiting from Market Volatility Virtu Financial: Official Website
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source: wikipedia
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#6
Jump Trading
Its proprietary trading spans equities, futures, options, fixed income, and cryptocurrencies, with a dedicated crypto unit that processed over $100 billion in volume during 2021 alone.
SourcesWSJ: How Jump Trading Became a Crypto Powerhouse Bloomberg: Jump Trading - Building Microwave Towers for Speed Jump Trading: Official Website
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source: wikipedia
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#7
Susquehanna International Group (SIG)
Susquehanna International Group executes millions of options contracts daily, a volume that surpasses Hudson River Trading in the options market. Founded by professional poker players in 1987, SIG trains traders in game theory and probability, achieving a 15% higher win rate than the typical options market maker. Its venture arm was an early investor in ByteDance, generating returns that dwarf those of Jump's crypto portfolio.
SourcesWSJ: Inside SIG - The Options Market Making Powerhouse Bloomberg: SIG - The Options Firm Behind the TikTok Bet Susquehanna International Group: Official Website
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source: wikipedia
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#8
Hudson River Trading (HRT)
The firm employs over 1,000 algorithm engineers and trades in 200+ markets using custom hardware that reduces latency by 40% compared to off-the-shelf solutions. HRT's research-driven approach produces 35% fewer failed trades than the industry average.
SourcesWSJ: Hudson River Trading Among the Top US Equity Volume Firms Bloomberg: Hudson River Trading - The Quiet Giant of HFT Hudson River Trading: Official Website
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source: wikipedia
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#9
Jane Street
Jane Street generated over $20 billion in revenue in 2023, making it arguably the most profitable trading firm per employee in the world. Founded in 2000, the New York-based firm dominates ETF arbitrage, fixed income, and options markets globally. Jane Street is also one of the largest proprietary crypto trading firms and trades roughly $17 trillion in securities annually.
SourcesWSJ: Jane Street - The Firm That Makes ETF Markets Work Bloomberg: Jane Street Made $21 Billion in Trading Revenue in 2023 Jane Street: Official Website
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source: wikipedia
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#10
Tower Research Capital
Tower Research Capital was founded in 1998 by former Merrill Lynch trader Mark Gorton and focuses exclusively on high-frequency trading across global equity, futures, and FX markets. The firm operates from offices in New York, London, and Singapore, maintaining co-location at major exchanges worldwide. Tower is known for its ultra-low-latency microwave and fiber-optic data networks spanning the US and Europe.
SourcesCFTC: Tower Research Capital Settlement Order (2019)Bloomberg: Tower Research Settles CFTC Spoofing Case for $67 Million Tower Research Capital: Official Website
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source: wikipedia

Image credits

Renaissance Technologies: Renaissance Technologies.png / Wikimedia Commons
Two Sigma: Two Sigma / Wikipedia
D.E. Shaw: D. E. Shaw & Co. logo.png / Wikimedia Commons
Jane Street: Jane Street Capital / Wikipedia

Frequently asked questions

What is an algorithmic trading firm?

An algorithmic trading firm uses computer programs and mathematical models to execute trades at high speed and volume, often leveraging strategies such as market making, arbitrage, and trend following.

How do algorithmic trading firms differ from traditional hedge funds?

Algorithmic trading firms rely on automated, data-driven strategies executed by algorithms, while traditional hedge funds may use a mix of human judgment and discretionary trading with longer holding periods.

Which US algorithmic trading firm is considered the largest?

Citadel Securities and Virtu Financial are often cited among the largest US algorithmic trading firms by volume and market share, though specific rankings can vary by criteria.

What qualifications are needed to work at an algorithmic trading firm?

A strong background in quantitative fields such as mathematics, physics, computer science, or engineering is typically required, along with programming skills in C++, Python, or similar languages.

Are algorithmic trading firms regulated in the US?

Yes, they are regulated by the SEC and FINRA, and must comply with rules regarding market manipulation, best execution, and risk controls, especially if they operate as broker-dealers or registered investment advisers.

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