The institutional ownership base of Chubb Limited is anchored by major passive asset management conglomerates and index fund providers. The Vanguard Group stands as the single largest institutional shareholder, holding approximately 36.4 million shares amounting to roughly 9.26 percent of the total common stock value. Other major institutional stakeholders include Berkshire Hathaway—led by Warren Buffett—which holds a massive multi-billion-dollar stake representing roughly 7.96 percent of the company, alongside BlackRock and State Street Global Advisors.