BlackRock faces a new lawsuit from former portfolio manager Essam Abdullah. He alleges the firm improperly withheld $12.4 million in deferred compensation. Filed in New York, the lawsuit accuses BlackRock of "unjust enrichment."

This legal challenge could have significant ramifications. The case could force BlackRock to reveal details about its secretive, complex compensation model, a key tool for retaining top talent in the competitive asset management industry. Such a disclosure would offer a rare look into the firm's pay structure.