A Competitor Is Stealing My Customers and Employees (Missouri)

What you do have a claim for is when the competitor crossed a line into improper conduct — using stolen confidential data, breaching a signed agreement, or lying to take your customers. That's the real question, and everything below is about figuring out which side of the line your situation falls on, then acting fast if it's the wrong side.

First, separate lawful competition from improper conduct

Before you spend a dime on a lawyer, sort what actually happened into two piles: hard competition (legal) and improper means (actionable).

• Lawful and not actionable: an at-will employee quits and joins a competitor; the competitor offers your customer a better price or better service; a former salesperson calls on accounts using nothing but their own general skill and memory.
• Potentially actionable: a departed employee took your customer list, pricing models, or other confidential files; an employee broke a signed non-compete or non-solicitation agreement; the competitor lied to your customer (for example, falsely claiming you're going out of business) to win the account; someone used threats or deceit.

The single most useful thing you can do right now is identify exactly what was taken and how. Was it just people and goodwill — or was it data and a signed promise? That distinction decides whether you have a case.

The legal theories that actually give you a claim

Missouri gives a wronged business several distinct tools. The right one depends on the facts.

• Tortious interference with a contract or a valid business expectancy. You generally must prove five things: (1) a contract or a reasonable, probable business expectancy; (2) the competitor's knowledge of it; (3) intentional interference inducing a breach or termination; (4) the absence of justification — meaning the competitor used improper means rather than fair competition; and (5) damages. The fourth element is where most of these cases live or die.
• Misappropriation of trade secrets under the Missouri Uniform Trade Secrets Act (RSMo § 417.450 et seq., Chapter 417). If a departed employee took your customer list, pricing, formulas, or processes — information you kept confidential and that has value precisely because it isn't public — that's misappropriation. The same conduct may also violate the federal Defend Trade Secrets Act (18 U.S.C. § 1836), which can give you a parallel claim in federal court. Keep the two distinct: one is Missouri state law, the other is federal.
• Breach of a non-compete or non-solicitation agreement. If the employees signed a restrictive covenant, breaking it is its own claim. Missouri enforces reasonable covenants, and RSMo § 431.202 specifically authorizes certain agreements protecting customer relationships and trade secrets when they are reasonable in scope and duration.
• Unfair competition. A broader category covering deceptive or wrongful competitive practices that don't fit neatly elsewhere.

What "improper means" really means

This is the heart of it. "Improper means" is not aggressive competition — it's conduct the law treats as wrongful in itself.

• Improper: using stolen confidential data, breaching a signed restrictive covenant, fraud or misrepresentation to a customer, threats, bribery, or electronic intrusion.
• Not improper: offering a better price, providing better service, hiring an at-will employee who was free to leave, or calling on customers who chose to switch.

So if your story is "they're cheaper and my customers like them," you likely don't have a claim. If your story is "they took my pricing spreadsheet and my non-compete signer is using it to undercut me on my own accounts," now you're talking about a real, fast-moving case.

Move quickly: preserve evidence and quantify the harm

These disputes are won in the first days, on the contemporaneous record — not later, on testimony.

• Lock down the evidence. Disable departed employees' access immediately. Preserve emails, device logs, download histories, and file-access records. Evidence that someone bulk-downloaded files or wiped a laptop before leaving is often decisive.
• Pin down what was taken. Identify the specific files, accounts, or agreements at issue. "Something feels off" won't support a claim; "they exported the customer database on their last day" will.
• Pull the signed agreements. Find the non-compete, non-solicitation, and confidentiality agreements the departed employees signed, and confirm their scope and duration.
• Quantify your damages. Document the customers lost, the revenue tied to them, and the margin you're losing. Lost-customer damages are concrete and persuasive when you can show the numbers.

Your options, from firmest letter to courtroom

You don't always need to file suit, but where trade secrets or a covenant are involved, speed matters.

• Send a cease-and-desist. A targeted demand letter to the competitor (and the former employees) can stop ongoing misuse, put them on notice, and build a record. Sometimes it ends the problem on its own.
• Seek a TRO or preliminary injunction. Where a trade secret is being actively misused or a non-compete is being breached, your attorney can move immediately for a temporary restraining order and then a preliminary injunction. The loss of confidential information and customer goodwill is often exactly the kind of irreparable harm courts will act fast to stop.
• Pursue damages. Beyond stopping the conduct, you can seek compensatory damages, and — for willful and malicious trade-secret misappropriation — exemplary damages and attorneys' fees under the Trade Secrets Act.
• Be realistic if the line wasn't crossed. If it turns out the employees were at-will, signed nothing, and took no data, the calmest path may be to compete harder and tighten your own agreements going forward.

Frequently Asked Questions