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  2. Antitrust Law

Antitrust Law Attorneys in Menasha and Green Bay, WI

Antitrust law exists to protect consumers and businesses from monopolies, unfair restraints and other practices that restrict competition. Zhang and Eisenheim represents plaintiffs in Menasha, Green Bay and across Wisconsin in complex antitrust matters at both the state and federal levels.

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Antitrust Law Cases We Represent

Zhang & Eisenheim represents clients in a wide range of antitrust law cases, including:

Under the Sherman Act:

  • Price-fixing or bid-rigging agreements (Section 1)
  • Monopolization or attempted monopolization (Section 2)

Under the Clayton Act:

  • Tying arrangements and exclusive dealing (Section 3)
  • Anti-competitive mergers (Section 7)
  • Private lawsuits seeking treble damages or injunctions (Sections 4 & 5)

Under the Federal Trade Commission Act:

  • Deceptive business conduct that restrains competition (Section 5)

State-level cases:

  • Violations of Wisconsin’s unfair trade practices statutes
  • Gasoline minimum markup violations
  • Prohibited vertical integration (e.g., dealership laws)
  • Industry-specific restrictions (e.g., funeral home/cemetery ownership)

Our Approach to Antitrust Law

At Zhang & Eisenheim, we begin by carefully reviewing market structure, conduct and harm. We then investigate the actions of the business or businesses involved to determine whether illegal restraint of trade has occurred.

Our team builds claims supported by economic evidence, industry knowledge and a deep understanding of competition law. If a claim has merit, we pursue civil litigation on behalf of affected individuals or businesses. We review all evidence in detail.

When to Call a Lawyer

If you’ve been pushed out of a market, forced into exclusive contracts or subjected to unfair pricing practices by a competitor, supplier or buyer, it’s time to talk to us. Antitrust harm is often hidden behind layers of policy and industry norms, but that doesn’t make it legal.

Antitrust law isn’t just about huge corporations. Small and mid-size businesses can be victims, too. If you’re facing unfair restrictions or think a merger or policy has hurt (or will hurt) your ability to compete, you may have legal options.

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Frequently Asked Questions

What are the signs of an antitrust violation?

Unusual patterns in pricing, contracts that limit your ability to buy from other suppliers or companies working together to rig bids or divide markets can all point to illegal activity. If you’re a business owner and find yourself unfairly excluded from a market, or a consumer noticing prices that never seem to drop, it’s worth investigating whether competition laws are being broken. These violations often happen behind the scenes, but the financial impact is very real.

Can individuals bring antitrust lawsuits?

Yes. Federal and state antitrust laws allow individuals and businesses to bring private actions. In fact, private enforcement is a cornerstone of the U.S. antitrust system. If you’ve been financially harmed by monopolistic behavior, price-fixing or market manipulation, you may be entitled to compensation—and possibly triple damages, depending on the violation and the facts of the case.

What does it mean to sue under state law?

Many states, including Wisconsin, have their own antitrust statutes that sometimes offer more specific protections than federal law. In some cases, state law might apply to industries or conduct that federal law doesn’t address directly. We assess your case under both sets of rules to determine the best legal path and whether multiple claims can be filed together for greater effect.

How do I know if I have a case?

You may not be sure—and that’s okay. Antitrust issues often go unnoticed or get dismissed as just “how business works.” But if you suspect foul play in your industry or marketplace, we can help you find out. We gather the facts, consult with experts if needed and determine whether a legal violation exists. If it does, we’ll guide you through every step of enforcing your rights.

Facing antitrust violations? Don’t face them alone.

Contact Zhang & Eisenheim today. We’re ready to defend your rights and help you protect your future.

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