Startup money comes from personal finances, friends, family and sometimes investors and banks if the concept is very strong and the management team looks good. Working capital is used for financing inventories, accounts receivable and the cash necessary to operate the business. When a business is perking along quite well, has a good track record for growth, then working capital is the easiest money to attract. Banks are traditional financiers for working capital and factoring companies also play a major role here. Growth capital is used for financing a plant expansion, purchasing new equipment, or training new people for the growth of your business.
Traditionally growth is financed by the profits of the operations.
Other sources for growth capital include venture capitalists, stockholders and taking your company public.