Armstrong Teasdale LLP
Member firm for USA, Missouri
With Office in USA, Nevada

Firm Overview

For more than a century, Armstrong Teasdale LLP has forged long-term relationships with clients large and small around the globe. With roots in the Midwest and offices across the country, Armstrong Teasdale is perfectly positioned to provide Lex Mundi member firms and clients innovative legal services. The firm is structured into four core practice groups: corporate services, financial and real estate services, intellectual property and litigation. Our attorneys work together to guide clients through virtually every challenge, from day-to-day operational decisions to some of the most complex legal matters.

With dozens of key practice areas and industry teams, our firm has the ability to provide services of scale, encompassing both traditional and niche fields such as agribusiness and food, complex commercial litigation, manufacturing, technology, public finance and municipal law, fire and electrical liability, health care and life sciences, higher education, noncompete, security clearance and privacy and data security.

Our intellectual property practice is one of our fastest growing and litigators in this practice have garnered high-profile courtroom successes. The St. Louis Business Journal has named our patent practice the largest in St. Louis for the past 12 years.

As an AmLaw 200 law firm, Armstrong Teasdale serves a broad client base including global and Fortune 500 companies. We also have the following subsidiaries: AT Government Strategies provides government relations and strategic counsel to advance the business objectives of companies, industry associations and other entities; Development Dynamics (“D2”), which provides an array of economic development advisory services; and LAWgical Choice, which uses advanced technology to organize and present relevant case information in a targeted, trial-ready format.


• Received multiple first-tier metropolitan rankings in the 2019 edition of the U.S. News & World Report and Best Lawyers list of “Best Law Firms.”

• The 2019 edition of Chambers USA: America’s Leading Lawyers for Business ranked 18 Armstrong Teasdale attorneys as leading lawyers in their respective practice areas.

• Received the highest possible score on the 2019 Corporate Equality Index, a national benchmarking survey and report on corporate policies and practices related to lesbian, gay, bisexual and transgender workplace equality. The survey is administered by the Human Rights Campaign Foundation, an arm of the largest LGBT civil rights organization in the United States.

• The National Law Review recognized Armstrong Teasdale with a 2018 Go-To Thought Leadership Award for our breadth of litigation coverage.

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