When you find out that your business partner has started a competing business, it can be quite a daunting experience. It is even worse for you if you think that your customers are being used, as well as personal data, or business opportunities, to gain an unfair advantage. However, whether you are able to do anything about this depends on the particular circumstances, your partnership terms of agreement, and the legal duties that your partner owes to your business.
According to Massachusetts law, a partner could face serious legal consequences if it is found to be competing unfairly with a business they still help to run. However, simply starting a new company does not automatically give the grounds for the filing of a lawsuit. Understanding your rights and the complexities of corporate litigation is essential to determine if legal action is appropriate.
The core duty of loyalty and good faith
To decide if a lawsuit is the best option, you should first study the legal baseline that governs business relationships in Massachusetts. Under statutory law, particularly Massachusetts General Laws Chapter 108A, Section 21, partners are bound by a strict statutory obligation. The statute states that each partner must account to the partnership for any benefit gained by them without getting permission from the other partners from any transaction connected to the partnership.
Apart from the statutes, Massachusetts common law enforces an even higher standard. The courts have for a long time determined that partners owe each other a duty of good faith and loyalty. This relationship is called a fiduciary bond, which requires that the parties’ personal self-interest acts in favor of the welfare of the joint business entity. If a partner acts independently and conceals financial maneuvers, or sets up another entity to absorb contracts that actually belong to the primary enterprise, they are directly breaching this standard.
The line between preparation and competition

The boundary lines for what is considered permissible preparation were established by the Massachusetts Supreme Judicial Court in the landmark case Meehan v. Shaughnessy, 404 Mass. 419 (1989). In that landmark case, the departing partners from a law firm planned a new venture while still at their old firm. The court ruled that it is legal for logistical preparation for a future business entity, but using unfair tactics to establish that plan crosses the line and could be an actionable breach.
Wrong conduct includes actions such as secretly soliciting clients before resigning, using the current firm’s proprietary infrastructure to initiate the new entity, lying to partners about intentions to depart, or using inside knowledge to secure a one-sided logistical advantage. If your partner has taken part in these covert actions but is still getting a salary, using up your office space, or managing your operational records, they have most likely crossed the line from legal preparation into unacceptable behavior.
The role of the Partnership Agreement
While common law offers robust protection, if a written partnership agreement is present or an operating agreement this changes the situation. A comprehensive partnership agreement usually contains restrictive covenants that reveal precisely what a partner can and cannot do throughout and after their tenure.
Non-compete clauses restrict a partner from being involved in any similar business activity within a specified geographic radius for a set period of time. Non-solicitation clauses prevent them from targeting the firm’s clients or hiring its workforce. If your partner violates these clear contractual provisions, you should be able to sue for breach of contract alongside the standard tort claims.
Legal remedies and damages available
If you decide to file a lawsuit in a Massachusetts state court, such as the Superior Court or the specialized Business Litigation Session, there are a few legal remedies available to redress the harm:
- Compensatory damages which are monetary awards for the measurable financial damage your business suffered. This includes loss of profits directly attributable to the diverted clients, as well as the cost of replacement of key employees who were poached wrongfully.
- Disgorgement of profits is a highly effective remedy in fiduciary litigation as it forces the wrongdoing partner to return all profits or compensation they earned while operating while in conflict with the business.
- Constructive trusts can impose a constructive trust over the assets or specific contracts of the new competing business. This legally mandates that any revenue generated from those wrongfully acquired clients belongs to your original partnership.
- Injunctive relief is available if the competing business is causing immediate, irreparable harm to your brand equity or customer base, your attorney can petition the court for a temporary restraining order or a preliminary injunction. This court order forces the rogue partner to halt their competing operations or stop contacting your clients while the broader lawsuit proceeds through the court system.
Next steps and preservation of evidence
If you believe your business partner has launched a competing business entity, your main priority should be to preserve the evidence. Do not consider confronting them until the company’s digital and physical records have been secured. You should audit your customer relationship management systems for unusual download activity, review financial statements for unexplained asset transfers, and preserve all email threads, text messages, and calendar invitations.
Once the evidence is in your hands, you should consult a business litigation attorney in Massachusetts. It will help you review your foundational corporate documents, assess the value of financial damage, and outline a litigation plan or alternative dispute resolution to protect your commercial enterprise.
