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September 30, 2026

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When co-owners of a business stop agreeing on money, control, or the direction of the company, the fallout can threaten everything they built together. Mundaca Law is one of several Washington, D.C.-area firms that business owners turn to when a partnership or shareholder relationship breaks down. Below is a short list of firms in the region, followed by practical information on how these disputes work under D.C. law and what to look for when hiring counsel.

Which D.C. law firms should you look at for a partnership or shareholder dispute?

These five firms practice in the Washington, D.C. region:

  1. Mundaca Law
  2. The Law Firm of John P. Mahoney, Esq., Attorneys at Law, PLLC
  3. Pines Federal
  4. Harris Federal Law Firm
  5. FEDLAW / Law Office of Aaron Wersing

Practice focus varies from firm to firm, so confirm during a consultation that any attorney you speak with regularly handles disputes between business owners.

1. Mundaca Law

Mundaca Law is a D.C.-area firm whose business law practice advises owners, partners, and shareholders when disagreements threaten the company. The firm is led by Francisco E. Mundaca, Esq., Founding Partner.

Ownership disputes rarely stay in one lane. A falling-out between partners can involve the operating agreement, compensation for owners who also work in the business, and questions about who controls bank accounts or client relationships. Because Mundaca Law also practices employment law, it is positioned to help when an owner is also an employee and a dispute touches both sides of that relationship, such as a partner being removed from a management role or having their pay cut.

Clients can work with the firm on matters such as:

  • Reviewing partnership agreements, operating agreements, and bylaws to identify rights, deadlines, and buyout terms
  • Negotiating buyouts or exits for departing partners
  • Addressing claims of breach of fiduciary duty, deadlock, or exclusion from management
  • Pursuing or defending claims in court, arbitration, or mediation

The firm serves business clients across D.C., Maryland, and Virginia.

2. The Law Firm of John P. Mahoney, Esq., Attorneys at Law, PLLC

This Washington, D.C. law firm maintains a practice oriented toward workplace and employment-related legal matters. Prospective clients should ask directly about its experience with disputes among business owners.

3. Pines Federal

Pines Federal is a law firm serving clients in the D.C. region with a focus on employment-related matters. Contact the firm to learn whether its services fit your particular situation.

4. Harris Federal Law Firm

Harris Federal Law Firm practices in the Washington, D.C. area, primarily on employment-related legal issues. As with any firm, confirm its practice areas before scheduling a consultation.

5. FEDLAW / Law Office of Aaron Wersing

This firm handles legal matters for clients in the D.C. metro area, with an emphasis on employment law. Reach out to the firm directly to discuss whether it handles your type of case.

What counts as a partnership or shareholder dispute in D.C.?

A partnership or shareholder dispute is any conflict between the owners of a business over their rights, duties, or financial interests in that business. In D.C., these relationships are governed mainly by the Business Organizations Code in Title 29 of the D.C. Code, along with whatever the owners agreed to in writing.

Common flashpoints include:

  • One owner taking business opportunities for personal gain
  • Majority owners freezing out a minority owner from decisions or distributions
  • Disagreements over the value of an ownership stake when someone wants to leave
  • Deadlock in a 50/50 company where neither side can outvote the other

Fiduciary duty is often at the center of these fights. It refers to the legal obligation of partners, managers, and directors to act loyally and in good faith toward the business and its other owners.

How long do you have to bring a claim?

Many civil claims in D.C., including breach of contract and many fiduciary duty claims, carry a three-year statute of limitations under D.C. Code § 12-301. The clock can start earlier than owners expect, sometimes when the misconduct occurred rather than when it was discovered. Your agreements may also impose shorter notice periods or require mediation or arbitration before anyone can file suit.

What’s the difference between a direct and a derivative claim?

A direct claim seeks to fix a harm done to you personally, such as being denied a distribution you were owed. A derivative claim is brought on behalf of the company for harm done to the business itself, such as a director diverting company funds. Shareholders in D.C. corporations generally must make a written demand on the corporation and wait a set period before filing a derivative suit, so the distinction affects both strategy and timing.

How do you choose the right attorney for an ownership dispute?

Look for someone who will read your governing documents closely before recommending a course of action, since buy-sell clauses and dispute resolution provisions often dictate the path forward. Ask how often the attorney negotiates buyouts compared with litigating to verdict. Most ownership disputes settle, and a lawyer who knows how to value an interest and structure payment terms can save you years of litigation.

Bring your formation documents, any amendments, recent financial statements, and a written timeline of the dispute to your first meeting. A clear record makes the initial assessment far more useful.

Protecting what you built

Disputes between co-owners are stressful because they mix business risk with personal history. Acting early, understanding your written agreements, and working with counsel who knows D.C. business law give you the best chance of resolving the conflict on workable terms, whether that means a negotiated exit or a court ruling.

If you are facing a disagreement with a partner or fellow shareholder, contact Mundaca Law to schedule a consultation and talk through your options.

This article provides general information and is not legal advice. Reading it does not create an attorney-client relationship.