Insights

Antitrust Expertise Constantine Cannon LLP is a recognized specialty law firm with a strong track record in antitrust, complex commercial litigation, and government investigations, indicating potential opportunities to engage with large corporate clients facing regulatory scrutiny or competition concerns.

Global Reach With offices in New York, Washington, D.C., and San Francisco and experience advising foreign governments and multinational companies, there is potential to pursue cross-border matters, international investigations, and advisory work for global clients expanding in the U.S.

Diverse Practice The firm’s broad practice areas—IP and technology, whistleblower law, securities litigation, corporate compliance, and ESI consulting—open doors for cross-selling services to Fortune 500 clients needing integrated legal, regulatory, and eDiscovery solutions.

Recent Recognition Recent Chambers and Partners ranking and other accolades, plus leadership promotions, signal market credibility that can be leveraged in outreach to procurement teams and risk managers seeking established, trustworthy firms for high-stakes matters.

Financials & Growth Revenue in the $10M–$25M range and a lean headcount suggest a boutique firm with agility and potential for high-margin, targeted engagements, including selective retainer work, strategic partnerships, or managed services in compliance and investigations.

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Constantine LLP Tech Stack

Constantine LLP uses 8 technology products and services including HubSpot Analytics, Linkedin Insight Tag, WordPress, and more. Explore Constantine LLP's tech stack below.

Constantine LLP's Email Address Formats

Constantine LLP uses at least 6 email formats:
Constantine LLP Email FormatsExamplePercentage
FLast@constantinecannon.comJDoe@constantinecannon.com
92%
Last@constantinecannon.comDoe@constantinecannon.com
5%
F.Last@constantinecannon.comJ.Doe@constantinecannon.com
2%
FirstLast@constantinecannon.comJohnDoe@constantinecannon.com
1%
FLast@cpny.comJDoe@cpny.com
90%
Last@cpny.comDoe@cpny.com
10%

Frequently Asked Questions

What is Constantine LLP's phone number?

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You can contact Constantine LLP'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 Constantine LLP's official website and social media links?

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Constantine LLP's official website is constantinellp.com and has social profiles on LinkedIn.

How much revenue does Constantine LLP generate?

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As of November 2026, Constantine LLP's annual revenue is estimated to be $10M - $25M.

What is Constantine LLP's SIC code and NAICS code?

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Constantine LLP's SIC code is 8111 - Legal Services and NAICS code is 54111 - Offices of Lawyers.

How many employees does Constantine LLP have currently?

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As of November 2026, Constantine LLP has approximately 71 employees across 3 continents, including North America, Europe and Africa. Key team members include Partner: A. M., Managing Partner Of The Ny Office: J. S. and Partner: M. D. Explore Constantine LLP's employee directory with LeadIQ.

What industry does Constantine LLP belong to?

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Constantine LLP operates in the Law Practice industry.

What technology does Constantine LLP use?

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Constantine LLP's tech stack includes HubSpot Analytics, Linkedin Insight Tag, WordPress, Shopify, Mailchimp, Mimecast Secure Email Gateway, Google Cloud and WP Engine.

What is Constantine LLP's email format?

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Constantine LLP's email format typically follows the pattern of FLast@constantinecannon.com. Find more Constantine LLP email formats with LeadIQ.

When was Constantine LLP founded?

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Constantine LLP was founded in 1994.
Constantine LLP logo

Constantine LLP

Law PracticeNew York, United States51-200 Employees

Constantine Cannon LLP is an international law practice with offices in New York, Washington, D.C., and San Francisco. The firm specializes in antitrust law and complex commercial litigation, along with areas such as intellectual property, technology, whistleblower law, government relations, securities litigation, corporate compliance, monitoring and investigations, and electronic discovery consulting. It serves both plaintiffs and defendants, ranging from individual entrepreneurs to Fortune 500 companies, and has secured trial verdicts and settlements that rank among the largest of their kind. In addition to representing corporate clients, the firm counsels foreign governments and companies on U.S. law and handles international investigations, arbitrations, and interactions with the United Nations. Based in the United States, Constantine Cannon is recognized for its combination of advocacy, advisory work, and a commitment to ethics and integrity across courtroom and boardroom contexts. A recent development includes recognition as a leading firm in the Chambers and Partners USA Guide for 2026.

Section iconCompany Overview

Phone number
SIC Code
8111 - Legal Services
NAICS Code
54111 - Offices of Lawyers
Founded
1994
Employees
51-200

Section iconFunding & Financials

  • $10M - $25M

    Constantine LLP's revenue is estimated to be in the range of $10M - $25M

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