(Bloomberg) -- The patent that’s given Vanguard Group an edge over competitors for the past 20 years — and helped its clients pull in more than $100 billion worth of additional investment gains — expired today. Most Read from BloombergA 32-Year-Old Nears Billionaire Status by Using AI to Broker Japan MergersBiden, McCarthy Voice Cautious Optimism on Debt Deal After TalksGoogle Billionaire Sergey Brin Gifts $600 Million in Surging SharesGoldman Banker Wins Promotion, Then Leaves for Rival Two Wee