Here Is How Shares of Troubled Wells Fargo Got Their Groove Back

Tim Sloan, who took over as chief executive at scandal-ridden Wells Fargo (WFC) , after John Stump's unceremonious departure may be silently winning Wall Street's badge of approval.

Wells Fargo has actually become one of the best growth opportunities.

Shares of this storied financial institution, of which Warren E. Buffett hasn't sold a single share after the fake account scandal erupted in September, are up 15%-plus since Sloan took charge of affairs.

It is evident that Wells Fargo has managed to garner investor acceptance. Consider its close rivals: Citigroup is up about 9% in the past month; shares of JPMorgan Chase, the biggest lender in terms of market value, are up about 13%; and U.S. Bancorp, the fifth-largest national commercial bank, has seen a nearly 12% jump.

Wells Fargo and Citigroup are holdings in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. See how Cramer rates the stock here. Want to be alerted before Cramer buys or sells WFC and C? Learn more now.

There are three factors that explain why the bank is doing well.

First, is Buffett's steadfast support. This stands in sharp contrast to star fund managers such as Will Danoff of Fidelity's Contrafund who trimmed his stake.

Buffett's Berkshire Hathaway is Wells Fargo's biggest shareholder. He personally owns 2 million shares.

The Oracle of Omaha, who considers Wells Fargo to be an "incredible institution," has suggested that Tim Sloan is the right man for the job.

The second factor helping Wells Fargo is that Sloan has ushered in an era of transformation at a fast clip. Stumpf was known for driving an aggressive incentivized structure, compelling employees to commit large-scale fraud.

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