In this segment from Thursday's edition of Investor Beat, Motley Fool analyst Matt Koppenheffer tells investors why Citigroup (NYSE:C) is a stock on his radar today.

After having its capital plan rejected by the Fed due to unsatisfactory risk management during the Fed's annual banking stress tests, the market turned on Citigroup, and the stock saw a sell-off. Matt however sees a lot more to the story than just a simple rejection, and tells investors why this Citigroup stock sale could represent a great time to buy.

Big banking's little $20.8 trillion secret
There's a brand-new company that's revolutionizing banking, and is poised to kill the hated traditional brick-and-mortar banks. That's bad for them, but great for investors. And amazingly, despite its rapid growth, this company is still flying under the radar of Wall Street. To learn about about this company, click here to access our new special free report.

Alison Southwick has no position in any stocks mentioned. Matt Koppenheffer owns shares of Citigroup. The Motley Fool owns shares of Citigroup. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.