Marcus, Blank, and early investor Kenneth Langone all became billionaires due to the company's success, according to Forbes.
Marcus now has a net worth of $5.9 billion, Forbes estimates. Blank is worth $5 billion, according to Forbes, and Langone's net worth stands at $3.7 billion.
Marcus served as the chairman of Home Depot's board until he retired in 2002, according to Bloomberg.