This article follows up on our prior analysis of the Delaware Court of Chancery’s liability determination in the Alexion-Syntimmune case, available here.
In designing the earnout structure, parties should anticipate how expectation damages would be determined by a court using a discounted, probability-weighted mathematical method.
On June 11, 2025, the Delaware Court of Chancery established an important framework for how courts may approach the calculation of earnout damages in pharma milestone disputes in its most recent decision in Shareholder Representative Services LLC v. Alexion Pharmaceuticals, Inc.[1] In an earlier opinion (the “September Opinion”), the Court found that a buyer, Alexion, was liable for breach of contract for its failure to use commercially reasonable efforts to achieve milestones for which future earnout payments may have become due to the selling securityholders of Syntimmune, Inc.[2] The June 11 opinion adopted a probability-based mathematical framework to determine the amount of damages owed and it provides a number of important takeaways:Continue Reading Calculating Pharma Earnout Damages: Strategic Lessons for Designing Milestone Frameworks