In most countries, equity is a cheap source of funding for a country's largest financial institutions. On average, the stocks of the top 10% financial companies in a country account for over a quarter of total market capitalization, but these stocks earn returns that are significantly lower than...

The largest commercial bank stocks, ranked by total size of the balance sheet, have significantly lower risk-adjusted returns than small- and medium-sized bank stocks, even though large banks are significantly more levered. We uncover a size factor in the component of bank returns that is...