After the resent financial crisis in 2007-2009, the terminology of 'too-big-to-fail' has become an increasingly debated topic around the world, referring to risk-taking by banks that causes systemic risk due to their size and complexity. Large capital contribution packages, implicit guarantees, has been paid out in order to prevent financial meltdown while giving banks and its creditors the incentive to take on higher risk, causing moral hazard. This thesis aims to determine what bank activities that influence implicit guarantees that is measured by banks risk-taking, distance from insolvency, in the four largest bank in Sweden during the time period 2001 to 2015. By a panel regression analysis, we can see that total asset and debt securities influences the banks risk-taking. From the findings we can conclude that the problem of 'too-big-to-fail' exists in Sweden.