The correct answer is: "a stock certificate".
A stock cerficate is a legal document that certificates the ownership of a certain amount of shares from a corporation.
On the other hand, a financial intermediary, is an institution which puts in relation the interests of individuals with money saved, and individuals seeking for financing. The excess of liquidity of savers is channeled by financial institutions (such as banks) and lended to finance demandants, in exchange for a retribution, usually in the form of interest payments. Other examples of financial intermediaries, apart from the banking system, are credit unions and insurance companies.
