Insights

Diversity & Equality Armstrong Teasdale was recognized with an Equality 100 award in the 2025 Corporate Equality Index, signaling a strong commitment to diversity and inclusive practices that may align with clients prioritizing ESG and governance criteria.

Scale & Capability With 501-1000 employees and revenue in the $100M-$250M range, Armstrong Teasdale sits among mid‑sized national firms, offering opportunities to upsell services such as complex commercial litigation, corporate, and regulatory matters to mid-market clients seeking scalable legal support.

Longstanding Reputation A century‑plus history (established 1901) and status as one of the top 200 U.S. law firms can be leveraged to engage clients seeking stability, proven track records, and cross‑border and global capability for enterprise‑level matters.

Strategic Expansion Recent recognition and growth signals suggest potential expansion in service lines or geographies; there may be sales opportunities around employment, governance, and industry‑specific regulatory compliance to support growing client portfolios.

Tech & Compliance Readiness As a modern law firm with a publicized privacy policy and disclaimer, there is potential to position compliance, data privacy, and technology‑driven legal operations services to clients prioritizing secure, efficient matter management and risk reduction.

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Armstrong Teasdale's Email Address Formats

Armstrong Teasdale uses at least 7 email formats:
Armstrong Teasdale Email FormatsExamplePercentage
FLast@atllp.comJDoe@atllp.com
94%
Last@atllp.comDoe@atllp.com
4%
FMiddleLast@atllp.comJMichaelDoe@atllp.com
1%
FiLast@atllp.comJoDoe@atllp.com
1%
FLast@armstrongteasdale.comJDoe@armstrongteasdale.com
96%
FirstLast@armstrongteasdale.comJohnDoe@armstrongteasdale.com
2%
Last@armstrongteasdale.comDoe@armstrongteasdale.com
2%

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.

How much revenue does Armstrong Teasdale generate?

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As of October 2026, Armstrong Teasdale's annual revenue is estimated to be $100M - $250M.

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 October 2026, Armstrong Teasdale has approximately 603 employees across 4 continents, including North America, Europe and Asia. Key team members include Chief Financial Officer - Cpa: A. D. S., Chief Growth Officer: C. D. and Partner: J. E. T. 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@atllp.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

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