Anticompetitive practices are business tactics that artificially suppress competition so a company or group of companies can profit without actually competing on price, quality, or service. Federal law targets these tactics through three statutes (the Sherman Act, the Clayton Act, and the Federal Trade Commission Act), and the penalties are severe: fines up to $100 million per corporation, up to ten years in federal prison for individuals, and triple damages in private lawsuits.1Office of the Law Revision Counsel. 15 USC 1 – Trusts, Etc., in Restraint of Trade Illegal; Penalty The conduct falls into a handful of recognizable categories, and knowing what they look like is the first step to spotting one.
What Counts as an Anticompetitive Practice
The label covers three broad kinds of conduct. First, agreements between competitors who should be rivals but instead cooperate on price, on who bids for what, or on which customers each firm gets to keep. Second, exclusionary conduct by a dominant firm that uses its market power to shut smaller rivals out rather than beat them on the merits. Third, mergers and acquisitions that concentrate a market so much that competition is meaningfully reduced.
Not every restraint on trade is illegal. Some contracts limit what a party can do (a franchisee agrees not to sell competing brands, a manufacturer requires certain service standards) without meaningfully harming competition. What the law targets is conduct that suppresses the independent decision-making a functioning market depends on.
Agreements Between Competitors
The most aggressively prosecuted anticompetitive practices involve competitors secretly coordinating instead of competing. Federal enforcers treat these horizontal agreements as criminal offenses.
Price-fixing is the clearest version. Companies that should be setting prices independently agree to charge the same amount, or to hold prices above a floor. The agreement does not have to be written or formal. Competitors talking pricing strategy at a dinner and then adopting similar prices afterward can be enough if the evidence shows a mutual understanding.
Bid-rigging corrupts procurement. Firms that should be competing for a contract coordinate their bids in advance so a predetermined winner takes the job. Losing bidders submit inflated proposals designed to lose, and the conspirators typically rotate who wins over time. Government contracts are a frequent target, which is why federal investigators pay close attention to bidding patterns on public projects.
Market allocation reaches the same result through geography or customer lists. Competitors agree that one firm takes the eastern region while another takes the west, or that each sticks to certain customer segments. Once rivals stop overlapping, each one becomes something close to a local monopolist, free to charge what the market will bear.
Anticompetitive Conduct by Dominant Firms
A company does not need co-conspirators to break antitrust law. Section 2 of the Sherman Act makes it a felony to monopolize, attempt to monopolize, or conspire to monopolize any part of trade or commerce.2Office of the Law Revision Counsel. 15 USC 2 – Monopolizing Trade a Felony; Penalty Having a monopoly is not itself illegal. What matters is how the firm got there and what it does to keep its position. Dominance built on a better product is fine. Dominance maintained by shutting rivals out is not.
Predatory pricing is the textbook example. A dominant firm cuts prices below its own costs, absorbs the losses, and waits for smaller competitors to fail. Once the threat is gone, it raises prices well above competitive levels to recoup those losses. Courts are skeptical of predatory pricing claims because below-cost pricing benefits consumers in the short run, but the tactic is illegal when the predator has a realistic chance of recouping through later monopoly profits.
Tying arrangements are another common concern. A company with dominance in one product forces buyers to also purchase a second, separate product as a condition of the sale. Want the industry-standard operating system? You also have to take the company’s browser or media player. Tying leverages power in one market to gain an unearned advantage in another.
Exclusive dealing arrangements require a buyer or distributor to work only with one supplier, blocking competitors from reaching those distribution channels. These are not automatically illegal. Courts look at how much of the relevant market the arrangement forecloses to rivals.3Federal Trade Commission. 15 USC 12-27 – Clayton Act
Vertical Price Restraints
Vertical agreements run between companies at different levels of the supply chain, like a manufacturer and its retailers. A manufacturer telling retailers what price to charge for its product was once treated as automatically illegal. The Supreme Court changed that in 2007 in Leegin Creative Leather Products v. PSKS, holding that vertical price agreements should be evaluated under the rule of reason rather than condemned outright.4Justia. Leegin Creative Leather Products, Inc. v PSKS, Inc., 551 US 877
Under the current standard, a manufacturer setting a minimum resale price is not automatically breaking the law. The practice can still be anticompetitive, especially when retailers are the ones pushing for price floors (which can signal a retailer cartel using the manufacturer as cover) or when the firm imposing the restraint holds significant market power.
Per Se Violations and the Rule of Reason
Courts use two frameworks to decide whether a business practice crosses the line. The distinction matters because it determines what the government has to prove and what defenses a company can raise.
Some conduct is so reliably harmful that courts treat it as illegal on its face. Price-fixing, bid-rigging, and market allocation among competitors are per se violations of the Sherman Act. The government does not have to show the conduct raised prices or hurt consumers. The agreement itself is the offense, and the companies involved cannot argue efficiency justifications.5Federal Trade Commission. The Antitrust Laws
Everything else is evaluated under the rule of reason. A court looks at competitive conditions in the industry, the actual effects of the practice, and whether the conduct produces legitimate benefits that outweigh its restrictions. A manufacturer requiring retailers to meet service standards might limit some competition between retailers, but if it produces better service and broader availability, a court can find it reasonable. Rule-of-reason cases are fact-intensive and expensive, which is exactly why the per se categories exist for conduct that almost never has a legitimate justification.
The Three Federal Antitrust Laws
Three statutes form the backbone of federal antitrust enforcement.
- Sherman Antitrust Act (15 U.S.C. §§ 1–7). The oldest and broadest antitrust law. Section 1 prohibits agreements that unreasonably restrain trade. Section 2 targets monopolization and attempts to monopolize. Violations are felonies.1Office of the Law Revision Counsel. 15 USC 1 – Trusts, Etc., in Restraint of Trade Illegal; Penalty
- Clayton Act (15 U.S.C. §§ 12–27). Fills gaps the Sherman Act left open. It addresses tying, exclusive dealing, and mergers that may substantially lessen competition, and it creates the private right to sue for treble damages.3Federal Trade Commission. 15 USC 12-27 – Clayton Act
- Federal Trade Commission Act (15 U.S.C. §§ 41–58). Establishes the FTC and empowers it to prevent unfair methods of competition and deceptive business practices through civil enforcement, administrative orders, and monetary relief.6Federal Trade Commission. Federal Trade Commission Act
Criminal Penalties
Sherman Act violations are federal felonies. For corporations, the maximum fine is $100 million per offense. For individuals, the maximum fine is $1 million, with up to ten years in federal prison.1Office of the Law Revision Counsel. 15 USC 1 – Trusts, Etc., in Restraint of Trade Illegal; Penalty Section 2 monopolization offenses carry identical maximum penalties.2Office of the Law Revision Counsel. 15 USC 2 – Monopolizing Trade a Felony; Penalty
Those caps can be exceeded in large-scale conspiracies. Under the federal alternative fine statute, a court may impose a fine of up to twice the gross gain the defendant derived from the offense, or twice the gross loss the offense caused to victims, whichever is greater.7Office of the Law Revision Counsel. 18 USC 3571 – Sentence of Fine A price-fixing conspiracy that inflicted $200 million in overcharges could result in a $400 million fine, far above the statutory $100 million ceiling. The DOJ Antitrust Division uses this provision regularly in major cartel cases.
Clayton Act violations carry only civil penalties. No one goes to prison for a merger that substantially lessens competition. The enforcement tools there are injunctions, divestitures, and damages in private lawsuits.
Private Lawsuits and Treble Damages
You do not need the government to bring your antitrust case. Anyone injured in their business or property by an antitrust violation can sue in federal court. If you win, the statute entitles you to three times your actual damages, plus the cost of litigation, including reasonable attorney’s fees.8Office of the Law Revision Counsel. 15 USC 15 – Suits by Persons Injured The prospect of tripled liability is why many antitrust violations are first pursued by private plaintiffs rather than by government agencies.
You have four years to file. The statute of limitations runs from the date your cause of action accrues, which is generally when the violation occurs and you suffer an injury.9Office of the Law Revision Counsel. 15 USC 15b – Limitation of Actions That clock can pause. If the conspirators actively concealed the scheme and you had no reasonable way to discover it, some courts delay the start of the limitations period until you actually learn of the violation. A pending government investigation can also toll the clock for the length of the investigation plus one additional year.
Merger Review Under the Hart-Scott-Rodino Act
Mergers and acquisitions can substantially lessen competition, and the Clayton Act prohibits those that do.10Office of the Law Revision Counsel. 15 USC 18 – Acquisition by One Corporation of Stock of Another The challenge is catching harmful mergers before they close, because unwinding a completed deal is far harder than blocking one in advance.
The Hart-Scott-Rodino Act solves this by requiring companies to notify the government and wait before completing large transactions.11Office of the Law Revision Counsel. 15 USC 18a – Premerger Notification and Waiting Period For 2026, the minimum size-of-transaction threshold is $133.9 million. Deals above $535.5 million are reportable regardless of the size of the parties. Between those figures, reporting depends on whether the parties meet certain revenue and asset thresholds ($267.8 million for one party and $26.8 million for the other).12Federal Trade Commission. Current Thresholds
Filing triggers a waiting period during which the FTC and DOJ review the deal. Filing fees for 2026 range from $35,000 for deals under $189.6 million to $2.46 million for deals valued at $5.869 billion or more.13Federal Trade Commission. Filing Fee Information If the agencies identify competitive concerns, they can request additional information (a “second request”), negotiate conditions, or sue to block the deal.
Who Enforces Antitrust Law
Two federal agencies share enforcement responsibility: the Department of Justice Antitrust Division and the Federal Trade Commission. Their jurisdictions overlap, but in practice they divide the work by industry and type of enforcement.14Federal Trade Commission. The Enforcers Only the DOJ can bring criminal antitrust prosecutions. The FTC operates exclusively through civil proceedings, using administrative complaints, consent orders, and federal court injunctions.
State attorneys general add a third layer. Federal law authorizes any state attorney general to bring a civil action on behalf of that state’s residents when a Sherman Act violation has caused them financial injury. These parens patriae suits carry the same treble damages available to private plaintiffs, plus attorney’s fees.15Office of the Law Revision Counsel. 15 USC 15c – Actions by State Attorneys General State AGs frequently join multi-state investigations, and many states have their own antitrust statutes with independent enforcement.
Reporting a Violation and Whistleblower Protection
Both the DOJ and FTC accept antitrust complaints from the public. The DOJ Antitrust Division maintains an online reporting portal where you can describe the conduct, identify the companies and individuals involved, and upload supporting documents. Reports can also be submitted by mail or phone.16United States Department of Justice. Report Antitrust Concerns to the Antitrust Division The FTC’s Bureau of Competition has its own separate intake form.17Federal Trade Commission. Antitrust Complaint Intake
A useful report includes specifics: which companies are involved, what products or services are affected, the geographic scope of the conduct, and a timeline of events. Records of conversations, internal documents, or evidence of sudden coordinated price changes help investigators separate a viable lead from a general complaint. Not every complaint leads to a formal investigation. Agency staff triage reports and allocate resources toward cases with the strongest evidence and the broadest market impact.
If you work at a company involved in an antitrust conspiracy, federal law protects you from retaliation for reporting it. The Criminal Antitrust Anti-Retaliation Act prohibits employers from firing, demoting, suspending, threatening, or otherwise discriminating against employees who provide information about antitrust violations to the government or to a supervisor with authority to investigate misconduct.18WhistleBlowers.gov. Criminal Antitrust Anti-Retaliation Act (CAARA) The protection covers employees, contractors, subcontractors, and agents. If your employer retaliates, you can file a complaint with the Secretary of Labor or, if the agency does not resolve it within 180 days, bring your own federal lawsuit. Remedies include reinstatement, back pay with interest, and reimbursement for litigation costs and attorney’s fees.
One limitation matters: these protections do not apply if you planned or initiated the antitrust violation yourself. The law shields those who discover and report wrongdoing, not those who create it and later develop cold feet.
Key Exemptions
Not all collective economic activity falls under antitrust scrutiny. The Clayton Act explicitly exempts labor organizations, declaring that human labor is not a commodity or article of commerce. Unions and their members can organize, collectively bargain, and engage in labor disputes without antitrust liability for those activities.19Office of the Law Revision Counsel. 15 USC 17 – Antitrust Laws Not Applicable to Labor Organizations Agricultural and horticultural cooperatives receive similar protection.
Other exemptions cover insurance (regulated primarily by states under the McCarran-Ferguson Act), certain joint activities approved by federal regulatory agencies, and some export trade associations. These carve-outs are interpreted narrowly. Conduct that exceeds their boundaries falls back under standard antitrust analysis.