Studies of legal mobilization in the European Union are animated by a core puzzle: Does the EU's multi-level judicial system advance the rights of the "have nots" or reinforce the influence of the "haves"? While some stress that EU protections of individual rights have expanded over time, others underscore that lawyers specializing in litigation before the European Court of Justice (CJEU) increasingly gravitate towards corporate law firms. Leveraging semi-structured interviews and time series analysis of an original dataset of parties and lawyers in all cases referred to the CJEU from national judges, we assess whether businesses obtain better legal representation before the Court and whether this advantage has grown over time. Our results speak to whether legal mobilization before the European Court tends to vindicate individual rights or to magnify corporate power.