Beginning in 1989, the firm, which began as a venture capital source investing in start-up companies, adjusted its strategy to focus on leveraged buyouts and growth capital investments in more mature companies. Their model was to buy existing firms with money mostly borrowed against their assets, partner with existing management to apply Bain methodology to their operations (rather than the hostile takeovers practiced in other leverage buyout scenarios), and sell them off in a few years. Existing CEOs were offered large equity stakes in the process, owing to Bain Capital's belief in the emerging agency theory that CEOs should be bound to maximizing shareholder value rather than other goals. By the end of 1990, Bain had raised $175 million of capital and financed 35 companies with combined revenues of $3.5 billion.