Insights

Equality leadership Armstrong Teasdale has been recognized with the Equality 100 Award in the 2025 Corporate Equality Index, signaling strong diversity, equity, and inclusion leadership which can be a driver for partnering on compliance, corporate governance, and ESG initiatives.

Midmarket scale With 501-1000 employees and revenue in the 100M–250M range, the firm sits in the mid-market tier suitable for scalable legal programs, managed services, and retainer-based partnerships for corporate, IP, labor, and regulatory needs.

Global relationships A 125-year history and global client base suggest opportunities for cross-border and multinational counseling, including compliance, international dispute resolution, and multi-jurisdictional risk management services.

Stability and trust Longstanding reputation as a large U.S. law firm with a strong regional footprint presents a reliable platform for expanding practice areas such as cybersecurity, privacy, and complex transactional work for established clients.

Publicity and branding Recent recognition and visible DEI accolades offer a conversation starter for sponsorships, advisory services on corporate communications, and business development collaborations to enhance client-facing narratives.

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Armstrong Teasdale Tech Stack

Armstrong Teasdale's Email Address Formats

Armstrong Teasdale uses at least 2 format(s):
Armstrong Teasdale Email FormatsExamplePercentage
FLast@armstrongteasdale.comJDoe@armstrongteasdale.com
96%
FirstLast@armstrongteasdale.comJohnDoe@armstrongteasdale.com
2%
Last@armstrongteasdale.comDoe@armstrongteasdale.com
2%
FLast@atllp.comJDoe@atllp.com
94%
Last@atllp.comDoe@atllp.com
4%
FMiddleLast@atllp.comJMichaelDoe@atllp.com
1%
FiLast@atllp.comJoDoe@atllp.com
1%

Frequently Asked Questions

What is Armstrong Teasdale's phone number?

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You can contact Armstrong Teasdale'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 Armstrong Teasdale's official website and social media links?

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Armstrong Teasdale's official website is atllp.com and has social profiles on LinkedIn.

What is Armstrong Teasdale's NAICS code?

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Armstrong Teasdale's NAICS code is 54111 - Offices of Lawyers.

How many employees does Armstrong Teasdale have currently?

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As of July 2026, Armstrong Teasdale has approximately 609 employees across 3 continents, including North AmericaEuropeAsia. Key team members include Chief Financial Officer - Cpa: A. D. S.Chief Growth Officer: C. D.Partner: M. G.. Explore Armstrong Teasdale's employee directory with LeadIQ.

What industry does Armstrong Teasdale belong to?

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Armstrong Teasdale operates in the Law Practice industry.

What is Armstrong Teasdale's email format?

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Armstrong Teasdale's email format typically follows the pattern of FLast@armstrongteasdale.com. Find more Armstrong Teasdale email formats with LeadIQ.

When was Armstrong Teasdale founded?

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Armstrong Teasdale was founded in 1901.
Armstrong Teasdale logo

Armstrong Teasdale

Law PracticeMissouri, United States501-1000 Employees

Armstrong Teasdale LLP is a law practice headquartered in St. Louis, Missouri, serving clients around the globe. Founded in 1901, the firm has grown to be one of the 200 largest law firms in the United States. With a 125-year history, it has developed long-term relationships with a diverse client base.

The firm operates within the law practice industry and serves both large and small clients across a broad range of matters. In January 2025, Armstrong Teasdale was recognized with an Equality 100 award in the Human Rights Campaign Foundation's Corporate Equality Index.

Section iconCompany Overview

Phone number
Website
atllp.com
NAICS Code
54111 - Offices of Lawyers
Founded
1901
Employees
501-1000

Section iconFunding & Financials

  • $100M$250M

    Armstrong Teasdale's revenue is estimated to be in the range of $100M$250M

Section iconFunding & Financials

  • $100M$250M

    Armstrong Teasdale's revenue is estimated to be in the range of $100M$250M

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