Non-Solicitation Agreements in Missouri: Enforceability Rules

Federal law does not directly regulate non-solicitation agreements. The enforceability of restrictive covenants, including non-solicitation agreements, is primarily governed by state law. The Federal Trade Commission has proposed a rule to ban non-competes nationwide, but non-solicitation agreements have not been included in the FTC's primary enforcement focus. Federal courts apply state law principles when reviewing non-solicitation agreements in cases involving interstate commerce or diversity jurisdiction. The National Labor Relations Act (29 U.S.C. § 151 et seq.) may apply if non-solicitation restrictions interfere with employee organizing rights or concerted activity. Courts have generally held that narrowly tailored non-solicitation agreements do not violate NLRA protections. Employees retain federal protections for whistleblowing, union activity, and other protected conduct regardless of non-solicitation agreement language. The Defend Trade Secrets Act (18 U.S.C. § 1836) provides federal remedies for trade secret theft but does not create standards for non-solicitation enforceability.

Non-solicitation agreements are enforceable contracts between private parties, not subject to direct federal regulation. The Department of Labor does not maintain specific guidance on non-solicitation enforceability, as it falls outside wage-and-hour and labor standards jurisdiction.

Missouri's approach to non-solicitation agreements is codified primarily in Missouri Revised Statutes § 431.055, which applies reasonableness standards to restrictive covenants generally. Missouri courts have consistently held that non-solicitation agreements are enforceable when they meet three requirements: (1) the employer must have a legitimate business interest to protect, such as trade secrets, confidential business information, substantial relationships with prospective or existing customers, or substantial relationships with prospective or existing suppliers; (2) the restrictions on time, area, and line of business must be reasonable; and (3) the agreement must not impose undue hardship on the employee or the public (Domed Stadium test).

Missouri law is generally more favorable to non-solicitation agreements than to non-competes. Unlike non-competes, which restrict where an employee can work, non-solicitation agreements restrict only whom they can contact or solicit. This narrower restraint makes courts more likely to enforce them if the underlying interest is legitimate. Missouri courts have found that customer relationships, including existing and prospective customers with whom the employee worked, constitute protectable business interests. The state also recognizes the employer's interest in protecting trade secrets and confidential information.

Missouri applies consideration requirements strictly. If a non-solicitation agreement is presented at the inception of employment (as part of the offer), the job offer itself constitutes consideration. However, if presented after employment has begun, the employer must offer new consideration such as a promotion, raise, or continued employment (though courts debate whether continued employment alone suffices). Missouri also requires that the agreement be supported by adequate consideration and that both parties clearly intend to be bound.

The geographic scope must be reasonable based on the employer's actual business territory. A worldwide restriction is presumed unreasonable unless the employer operates globally. The time period is commonly one to three years for non-solicitation agreements, with shorter periods for lower-level employees and longer periods for those with access to significant customer relationships. Missouri does not have a statutory cap on duration but relies on case-by-case reasonableness review.

Missouri distinguishes between non-solicitation of employees and non-solicitation of customers or clients. Employee non-solicitation clauses restrict the employee from recruiting or hiring away other employees. Customer non-solicitation clauses restrict the employee from soliciting or serving customers they worked with during employment. Missouri enforces both types if the underlying interests are legitimate and the scope is reasonable, though customer restrictions are generally viewed more favorably.

Missouri recognizes several important exceptions and defenses to non-solicitation agreement enforcement. First, if the agreement is overly broad in scope, duration, or geographic area, the entire agreement may be unenforceable, as Missouri follows the doctrine that restrictive covenants will not be reformed or 'blue-penciled' by courts. Some Missouri courts have shown willingness to enforce a non-solicitation clause even when an accompanying non-compete is struck down, but this depends on whether they are severable.

Second, if the employer fails to provide adequate consideration, particularly for agreements signed after employment begins, the agreement may be unenforceable. Continued employment alone has been found insufficient consideration in some Missouri cases, though the law is not entirely settled. An employer offering a promotion, raise, or other tangible benefit at the time of execution strengthens enforceability.

Third, if the employee can demonstrate that the non-solicitation provision imposes undue hardship—such as forcing the employee to leave an entire industry or region where they possess legitimate skills—Missouri courts may refuse enforcement. This is a fact-specific inquiry and applies more readily to lower-wage workers whose industry options are limited.

Fourth, protected union and NLRA activity is not subject to restriction via non-solicitation agreements. Employees retain the right to engage in union organizing, collective bargaining, and concerted activity. A non-solicitation clause cannot prohibit an employee from communicating with coworkers about wages, hours, or conditions of employment.

Fifth, at-will employment does not automatically override non-solicitation agreements. Even in an at-will state like Missouri, if a non-solicitation agreement is valid, breach can result in liability. However, if an employer terminates an employee in violation of the agreement's terms or in retaliation for refusing to sign, the employee may have counterclaims.

Sixth, legitimate competition and solicitation are permitted. The employee may compete in the same industry and may advertise their services generally. The restriction applies only to direct solicitation of specific customers, employees, or suppliers identified during employment. Passive competition is protected.

Seventh, public policy may override enforcement in certain contexts. If enforcing a non-solicitation agreement would interfere with the free movement of labor or professional licensing requirements, courts may decline enforcement.

Step 1: Document the violation thoroughly. Keep copies of all communications between the employer and the employee, including the signed non-solicitation agreement, any amendments, and the date of execution. Document specific instances of alleged violation, such as emails, social media messages, or testimony from customers or employees who were solicited. Record the dates, names of individuals contacted, and the nature of the solicitation (employee recruitment, customer acquisition, supplier contact). Preserve phone records, calendar entries, or internal communications showing the employee's knowledge of the restriction. Take screenshots of any social media activity, advertising, or business solicitations. If the employee is your company, collect evidence that you did not solicit prohibited parties; if you are the employee, collect evidence supporting that your actions were lawful competition.

Step 2: Attempt internal resolution before litigation if feasible. Send a formal cease-and-desist letter to the employee or former employee, outlining the specific violations and demanding cessation of the prohibited conduct within a stated timeframe (typically 10–30 days). Include a copy of the non-solicitation agreement as reference. This letter should be professional and factual, not threatening. Keep a copy for your records. If the employee responds or clarifies their position, document their response. This internal step is often necessary to show the court that you attempted good-faith resolution and strengthens your case for injunctive relief if litigation becomes necessary. If the employee ceases the conduct, the matter may resolve without further action.

Step 3: File a civil lawsuit in Missouri circuit court if the violation continues. Missouri has 114 circuit courts organized by county; you file in the county where the defendant resides or where the alleged violation occurred. There is no administrative agency that handles non-solicitation disputes; the matter is purely civil litigation. Hire an attorney licensed in Missouri to draft and file a complaint for breach of contract and request for injunctive relief and damages. The complaint must identify the parties, the agreement, the legitimate business interest at stake, the specific violations, and the harm caused. The attorney will file in the appropriate circuit court and pay the applicable filing fee (typically $150–$300 depending on the county and claim amount). Include a request for a preliminary injunction to stop the conduct immediately while the case proceeds. Provide the court with the executed non-solicitation agreement, evidence of the violation, and documentation of damages or threatened harm.

Step 4: Understand the investigation and litigation timeline. After filing, the defendant has 30 days to respond to the complaint. Discovery (exchange of documents and witness statements) typically takes 4–8 months. The court may schedule a motion hearing within 60–90 days to decide whether to grant a preliminary injunction. If a preliminary injunction is granted, the employee must cease the prohibited conduct immediately or face contempt charges. Trial, if the case is not settled, typically occurs 12–18 months after filing. During this period, expect depositions of key witnesses, including customers or employees who were solicited, and document production. The court will apply the three-part reasonableness test: whether the employer has a legitimate business interest, whether the scope is reasonable, and whether enforcement imposes undue hardship. Be prepared to present evidence on each element.

Step 5: Consult an employment law attorney if you have not already done so. Contact a Missouri-licensed employment law attorney specializing in restrictive covenants and breach of contract. Most offer free initial consultations. An attorney will assess the strength of your case, the likelihood of enforceability under the three-part test, and the potential remedies (injunctive relief, damages, attorney fees if included in the agreement). For employees challenging the agreement, an attorney can argue invalidity based on overbreadth, lack of consideration, or other defenses. For employers seeking to enforce, an attorney will draft the complaint and manage all filings. Given the stakes—potential injunctive orders, damages awards, and business harm—professional legal counsel is strongly recommended before filing suit.