Department profile
Costin Marcus PLLC

Litigation: General Commercial

USA Guide 2026 : Virginia


Costin Marcus PLLC

About

Provided by Costin Marcus PLLC

Costin Marcus PLLC is a commercial litigation boutique in Alexandria, Virginia. We advocate for companies and individuals in high-stakes business disputes to help them achieve their objectives. Our decades of courtroom experience, combined with strategic foresight and precision, produce favorable results for our clients. Our clients have included some of the largest multinational corporations in the world, as well as closely-held corporations, partnerships, and individuals who are involved in, or who may become involved in, high-stakes business litigation. Clients turn to us when control of a business or money is at stake, or where a competitor, customer, employee or employer is violating a contract or breaking a law. Many of our cases are in federal and state court in Virginia—including on the “Rocket Docket” of the U.S. District Court for the Eastern District of Virginia, and in the Circuit Courts of Fairfax County and the City of Alexandria. We also frequently represent companies, business owners, and corporate executives in other federal and state courts in the greater Washington, D.C. area, and in arbitrations and mediations throughout the country.

Chambers Review

Provided by Chambers

Litigation: General Commercial - Virginia

Band 4

Band 4


What the Team is Known For

Costin Marcus is an Alexandria-based litigation boutique with a strong reputation for its advocacy skills. The team handles a wide array of commercial disputes across a broad range of subject matters, including trade secrets, securities and wider business tort claims.

Notable practitioners

Ellen Marcus is the head of the department and a key contact for clients.

Work Highlights

Provided by Chambers

  • Costin Marcus acted for Appian to secure a $2 billion jury verdict in a trade secrets claim brought against Pegasystems. The firm continued to defend the verdict before the Supreme Court of Virginia.

Strengths

Provided by Chambers

  • They're extremely personable and communicative with dedicated care and attention to me, as the client. I felt supported throughout the whole process from multiple attorneys throughout the engagement. It impressed me to find how kind and present they all were.

    Litigation: General Commercial respondentUSA
  • The firm provides a solid grasp of the procedural elements and maximized every avenue for establishing defenses. Its preparation of all filings and communications is exceptional, timely and strategic.

    Litigation: General Commercial respondentUSA

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