Core Insights - The Invesco KBW Bank Index ETF (NASDAQ: KBWB) has been tracking a selection of US bank stocks since its inception in 2011, following the 2008 global financial crisis [1] Group 1 - The ETF is currently facing challenges in the market environment [1] - The founder of Sungarden Investment Publishing emphasizes the importance of understanding market narratives for investment decisions [1] Group 2 - The article does not provide specific financial data or performance metrics related to the ETF or the underlying bank stocks [1]