FMR is "semper fidelis" (ever faithful) to its core business. The financial services conglomerate, known as Fidelity Investments, is one of the world's largest mutual fund firms. It serves more than 20 million individual and institutional clients, as well as 5,000-plus financial intermediary firms. Fidelity manages nearly 500 funds, boasting some $4.2 trillion in assets under administration, including managed assets of $1.8 trillion. The founding Johnson family controls Fidelity; Abigail Johnson, CEO Ned Johnson's daughter and one of America's wealthiest women, is its largest single shareholder.