Nearly 11,000 Harvard alumni filed an amicus brief supporting Harvard in its year-long legal battle against the Trump administration over federal research funding, with 881 Harvard Business School alumni included among the signatories. The filing backs Harvard College v. U.S. Department of Health and Human Services, reflecting how alumni networks are mobilizing to influence appellate outcomes. Harvard Business School’s 881 signatories span decades and include both public figures and private alumni, with the HBS contingent accounting for roughly 8% of the brief signers. The brief’s scale was described as the largest from any single school in American history, underscoring the institutional and reputational stakes. For university research operations, the dispute is a direct line between federal oversight and funding continuity, and the expanded alumni coalition suggests the litigation is drawing attention beyond campus governance into philanthropic and stakeholder communities.