After the 2008 financial crisis, the US government designated certain banks as "systemically important financial institutions" (SIFIs) based on their size and importance to the overall financial system. The SIFI designation is intended to subject these banks to increased regulatory oversight and requirements in order to minimize the risk of their failure and potential impact on the economy.
Some of the banks that have been designated as SIFIs include JPMorgan Chase, Citigroup, Bank of America, Goldman Sachs, and Wells Fargo. However, it's important to note that the SIFI designation can change over time based on various factors, and there is ongoing debate about the potential risks and benefits of "too big to fail" institutions in the financial system.