With U.S. stock futures trading slightly higher this morning on Friday, some of the stocks that may grab investor focus today are as follows: Wall Street expects Citigroup Inc. (NYSE: C) to report quarterly earnings at $1.20 per share on revenue of $20.39 billion before the opening bell. The bank reported earnings of $2.19 per share on revenue of $19.99 billion in the year-ago period. Citigroup shares rose 0.1% to $60.76 in after-hours trading. Argan, Inc. ...