Skip to main content


1144 Fifteenth Street
Suite 3100
Denver, CO 80202-2848

For more than four decades, Arnold & Porter’s Denver office has been a key component of the firm's global practice, marrying the capabilities, depth, and resources of a leading international law firm with a keen understanding of Colorado’s economy, politics, and history afforded by our longstanding presence in the Front Range and our deep personal and professional investment in the local community. We are among the largest and most diverse legal practices in the region, and lawyers from the Denver office are consistently ranked among the best in the United States by Chambers and Partners, Law360, and The American Lawyer.

Our integrated practice offerings reflect the breadth and depth of the substantive areas of expertise of the more than 35 Arnold & Porter lawyers resident in the firm’s Denver office. Though the geographical scope of our client base is global, our lawyers represent numerous Colorado- and Mountain West-based companies. We advise innovative startup companies to major multinational corporations in a broad range of industries with a cross-functional approach, bringing to bear our substantial litigation, transactional, and regulatory capabilities.

In the area of litigation and disputes, trial and appellate lawyers in the Denver office handle all stages of commercial, product liability, life sciences and healthcare, antitrust, environmental, and intellectual property litigation.

On the corporate and transactional side, Denver lawyers counsel public companies, private equity funds, and privately held companies across the broad spectrum of business matters, from emerging growth company financings, to large mergers and acquisitions and corporate finance transactions, to intellectual property and technology transactions.

Lawyers in the Denver office also counsel clients in the areas of government investigations and life sciences and healthcare compliance, regulatory, and environmental and energy, federal lands, and Native American matters.

We have played a lead role in representing clients in large commercial disputes, both as plaintiffs and defendants, all the way through trial, including DaVita Inc., DCP Midstream, and CoreSite. We have played a lead role in multijurisdictional mass tort litigation, including trials in jurisdictions that are considered hostile to corporate defendants. This has included representing Wyeth in both diet drug and hormone therapy cases and Philip Morris in smoking and health cases. We played the lead role in a number of recent litigation victories, including more than $100 million in damages awarded by the US Court of Federal Claims to our client, a decommissioned nuclear power plant, and a decertification of a nationwide class action on behalf of a major international retailer. The Denver office has represented the Hopi Tribe since 1986 in litigation and administrative proceedings concerning the tribe's land rights, said to be the largest quiet-title action in the US. Our corporate and finance lawyers represent large public and private equity-backed energy companies, significant private equity funds and investors, a major real estate-focused asset management firm, and several growing technology businesses. Denver’s growing team of intellectual property attorneys provides legal advice and representation to clients in a range of industries in the areas of litigation (including patent, trademark, and trade secrets litigation), transactions, internal portfolio analysis, and administrative proceedings before the US Patent and Trademark Office and its Patent Trial and Appeal Board.

We are also deeply invested in our community, and regularly provide lawyers and staff with opportunities to make an impact through pro bono and community service. Lawyers in our Denver office have achieved recent successes in the areas of family law, indigent rights, immigration, gun control, mental health care treatment, land use, veterans' rights, and an injunction against the state's use of improper requirements to deny driver's licenses to Colorado citizens. As a result of this work, the Colorado Lawyers Committee named us "Law Firm of the Year," and we have been recognized by the Colorado Supreme Court for our pro bono efforts in the state.