The first quarter of 2024 was the banner one for Citigroup Inc. (C) , with the stock outperforming the S&P 500 Index.This follows the 13.7% rally record by the company last year.Looking at its price performance, it seems that investors are turning bullish on this big bank, owing to its restructuring efforts and upbeat 2024 outlook. Moreover, favorable macroeconomic factors have driven positive sentiments for this bank stock.Notably, of the banks that are part of the S&P 500 Index, only Citigroup, Wells Farg ...