Analysis

Key Defense Strategies For Antitrust Defense Cases

July 2026 · 6 min read · John D. Kirby, Former Federal Prosecutor

In antitrust defense cases under the Sherman Act, particularly those involving per se violations like criminal price-fixing and bid rigging, the strategic landscape is complex yet critical for a successful outcome. The first line of defense often begins during the investigative phase when government scrutiny intensifies. Early engagement with legal counsel can be pivotal. Counsel should proactively assess whether any business practices might run afoul of antitrust laws while simultaneously advocating for thorough and fair treatment in the investigation process.

Pretrial motions are a cornerstone of antitrust defense strategy. Motions to dismiss under Rule 12(b)(6) may be appropriate if the complaint fails to state a claim upon which relief can be granted, such as by alleging insufficient facts to establish an illegal agreement. Additionally, motions for summary judgment can be filed where there is no genuine issue of material fact and the defendant is entitled to judgment as a matter of law. This is particularly effective when challenging per se violations that require clear evidence of an anticompetitive agreement.

Challenging government evidence is another critical phase. Defense attorneys must scrutinize whether the prosecution's case rests on admissible evidence, such as emails or recorded conversations, which often form the basis for proving illegal agreements in price-fixing and bid rigging cases. Attacking the credibility of witnesses and cross-examining agents can also undermine the government’s position.

The trial phase demands a nuanced approach tailored to the specifics of antitrust law. For per se violations, where certain conduct is presumed unlawful without detailed inquiry into its competitive effects, defendants may argue that their actions did not rise to the level of an illegal agreement as required by law. In contrast, rule-of-reason cases require a more extensive analysis, allowing defendants to present evidence demonstrating efficiencies or pro-competitive benefits from their practices.

Participation in the DOJ Antitrust Division's leniency program can offer substantial benefits for corporations and individuals alike. This program provides immunity from criminal prosecution to the first company or individual to self-report an antitrust violation and cooperate fully with the government investigation. For defense counsel, understanding the intricacies of this program is crucial as it can drastically alter sentencing outcomes if successfully navigated.

Finally, a comprehensive defense strategy in antitrust cases must consider both legal and practical elements. Legal arguments need to be grounded in precedent while remaining adaptable to new interpretations of antitrust law. Practical considerations include leveraging the leniency program when appropriate, challenging evidence rigorously at all stages, and presenting compelling defenses that highlight pro-competitive actions or the lack of an illegal agreement.

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