Insights

Established Market Presence As the oldest and largest independent futures brokerage in the U.S., R.J. O'Brien has extensive relationships with high-profile clients and a longstanding reputation, presenting opportunities to offer advanced trading technology and compliance solutions to enhance their operational efficiency.

Growth via Acquisition The recent acquisition by StoneX Group for approximately $900 million indicates a significant expansion phase, creating openings for integration services, after-market analytics solutions, and strategic consulting to support seamless transition and future scalability.

Technological Modernization With a sophisticated tech stack that includes platforms like Kendo UI, Bootstrap, and Windows Server, there is a strong potential to upsell innovative fintech solutions, cybersecurity enhancements, and data management tools to support their global order entry and clearing operations.

Global Expansion Strategy Recent leadership promotions and new website launches across EMEA suggest a focus on international market growth, offering opportunities to engage with regional compliance, localized trading platforms, and cross-border financial services tailored to their expanding global footprint.

Industry Leadership & Loyalty As a family-owned firm with deep industry roots and a focus on client-focused services rather than proprietary trading, R.J. O'Brien values trusted partnerships, making it an ideal candidate for customized service offerings in compliance consulting, risk management, and client relationship management solutions.

R.J. O'Brien Tech Stack

R.J. O'Brien uses 8 technology products and services including oEmbed, Font Awesome, Windows Server, and more. Explore R.J. O'Brien's tech stack below.

  • oEmbed
    Dev Tools
  • Font Awesome
    Font Scripts
  • Windows Server
    Operating Systems
  • X-XSS-Protection
    Security
  • Kendo UI
    UI Frameworks
  • Bootstrap
    UI Frameworks
  • Yii
    Web Frameworks
  • Microsoft IIS
    Web Servers

Media & News

R.J. O'Brien's Email Address Formats

R.J. O'Brien uses at least 1 format(s):
R.J. O'Brien Email FormatsExamplePercentage
FLast@rjobrien.comJDoe@rjobrien.com
95%
FirstL@rjobrien.comJohnD@rjobrien.com
3%
FirstLast@rjobrien.comJohnDoe@rjobrien.com
1%
First@rjobrien.comJohn@rjobrien.com
1%

Frequently Asked Questions

Where is R.J. O'Brien's headquarters located?

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R.J. O'Brien's main headquarters is located at 222 South Riverside Plaza Suite 1200 Chicago, Illinois 60606 United States. The company has employees across 3 continents, including North AmericaEuropeAsia.

What is R.J. O'Brien's phone number?

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You can contact R.J. O'Brien's main corporate office by phone at . For more prospecting data, LeadIQ has access to up-to-date and accurate contact information within our platform. Find, capture, and sync contact data to your CRM and sales tools in one click.

What is R.J. O'Brien's official website and social media links?

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R.J. O'Brien's official website is rjobrien.com and has social profiles on LinkedInCrunchbase.

What is R.J. O'Brien's SIC code NAICS code?

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R.J. O'Brien's SIC code is 6211 - Security Brokers, Dealers, and Flotation Companies NAICS code is 52 - Finance and Insurance.

How many employees does R.J. O'Brien have currently?

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As of May 2026, R.J. O'Brien has approximately 507 employees across 3 continents, including North AmericaEuropeAsia. Key team members include Chief Operating Officer Emea At R. J. O'brien: G. L.Chief Operating Officer, London: N. R.Vice President Fixed Income Group: C. M.. Explore R.J. O'Brien's employee directory with LeadIQ.

What industry does R.J. O'Brien belong to?

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R.J. O'Brien operates in the Financial Services industry.

What technology does R.J. O'Brien use?

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R.J. O'Brien's tech stack includes oEmbedFont AwesomeWindows ServerX-XSS-ProtectionKendo UIBootstrapYiiMicrosoft IIS.

What is R.J. O'Brien's email format?

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R.J. O'Brien's email format typically follows the pattern of FLast@rjobrien.com. Find more R.J. O'Brien email formats with LeadIQ.

When was R.J. O'Brien founded?

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R.J. O'Brien was founded in 1914.

R.J. O'Brien

Financial ServicesIllinois, United States501-1000 Employees

R.J. O'Brien & Associates LLC is a financial services company that operates as a futures brokerage and clearing firm, headquartered at 222 South Riverside Plaza Suite 1200, Chicago, Illinois 60606, and it has between 501 and 1,000 employees. It is a futures commission merchant (FCM) and is described as the oldest and largest independent futures brokerage and clearing firm in the United States, with a boutique profile. The firm is a full clearing member of CME Group and all its markets, Intercontinental Exchange, NYSE Liffe U.S., and the CBOE Futures Exchange, providing 24-hour execution and clearing on futures exchanges worldwide. It serves a global network of introducing brokers and clients, including more than 400 introducing brokers and many large financial, industrial, and agricultural institutions, and it clears more than 100,000 client accounts while not engaging in proprietary trading. In 2025, StoneX Group announced an agreement to acquire R.J. O'Brien Limited, and the company maintains a website at https://rjobrien.com.

Section iconCompany Overview

Headquarters
222 South Riverside Plaza Suite 1200 Chicago, Illinois 60606 United States
Phone number
SIC Code
6211 - Security Brokers, Dealers, and Flotation Companies
NAICS Code
52 - Finance and Insurance
Founded
1914
Employees
501-1000

Section iconFunding & Financials

  • $500M$1B

    R.J. O'Brien's revenue is estimated to be in the range of $500M$1B

Section iconFunding & Financials

  • $500M$1B

    R.J. O'Brien's revenue is estimated to be in the range of $500M$1B

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