My Majority Partner Runs Side CompaniesWith Our Business's Resources. Is That Legal?

Your majority partner runs the company you co-own. He also runs four, six, a dozen other businesses on the side — some sharing the same shop floor, the same employees, the same suppliers your company spent years building relationships with. On paper they're unrelated entities. In practice, you've started noticing that opportunities that should have gone to your company are landing somewhere else.

That pattern has a name in Wisconsin law, and it isn't a gray area. When a majority owner personally controls a web of affiliated companies operating alongside the business you co-own, and business, staff time, or opportunities quietly migrate toward those side companies, that's a fiduciary duty problem — specifically, a violation of the duty of loyalty and what's known as the corporate opportunity doctrine.

the duty of loyalty doesn't stop at your company's door

Majority owners in a closely held Wisconsin LLC or corporation owe fiduciary duties to their co-owners, and those duties don't evaporate because the majority owner is busy running other things. The duty of loyalty specifically prohibits a majority owner from taking an opportunity that belongs to your company — a customer, a contract, a piece of equipment, an employee's time — and instead directing it toward a company he personally, and exclusively, owns.

This becomes especially visible when the majority owner has built out an entire ecosystem of affiliated entities. A dozen LLCs registered to the same address, sharing officers and a registered agent, is not automatically wrongdoing — plenty of legitimate business owners structure their holdings that way. What matters is where the money, the customers, and the opportunities actually flow once that structure exists.

what the corporate opportunity doctrine actually protects

The corporate opportunity doctrine asks a specific question: was this opportunity one the company itself was positioned to pursue? If a majority owner learns of a business opportunity through his role running your company — a customer relationship, a piece of equipment, a lease, a chance to expand into a new territory — and instead diverts it to a side company he owns alone, he has taken something that belonged to all the owners, not just himself.

The self-dealing version of the same problem shows up in service and management contracts. Majority owners sometimes route company money to businesses they separately control through management fees, consulting arrangements, or supply contracts priced well above what an arm's-length vendor would charge. Wisconsin courts have addressed exactly this kind of related-party dealing under the LLC statute's fair-dealing and conflict-of-interest requirements. Gottsacker v. Monnier, 2005 WI 69, 281 Wis. 2d 361, 697 N.W.2d 436.

why this matters more when your company's value is relationships, not just assets

If your business's real value sits in customer relationships, supplier terms, or specialized capacity rather than hard assets, opportunity diversion is often the most damaging form of self-dealing precisely because it's hard to see in real time. Revenue that should have grown your company instead builds equity value in a business you have no stake in at all.

documenting the pattern

A single instance of a majority owner doing outside work is not, by itself, a fiduciary duty claim. What matters is the pattern: how many affiliated entities exist, how closely their business overlaps with yours, whether they share your company's employees, equipment, or customer relationships, and whether the timing of new opportunities lines up with when your company was positioned to pursue them itself.

Building that record — corporate filings, shared registered agents, overlapping personnel, redirected customer inquiries — is what turns a suspicion into a claim a Wisconsin court will take seriously. If you're watching a majority partner build out a personal empire of side businesses while your shared company's growth stalls, that pattern is worth a conversation with counsel before you accept it as just how he does business.