We've been avoiding most financial stocks, but now is the time to make an exception for this San Francisco-based banker. By Whitney Tilson, Contributing Editor and John Heins, Contributing Editor May 31, 2009 In a market in which bad calls have been the norm, a call we got right was our decision last summer to avoid most financial stocks.This was our reasoning as laid out in our September 2008 column: "Sadly, as bad as things have been, there's a strong case to be made that we've only seen the tip of the iceberg of housing- and mortgage-related problems, and that an enormous wave of home defaults, foreclosures and auctions is about to hit financial stocks." As a result, we not only avoided most financials but also sold short some of those that were most exposed to the ongoing housing meltdown. Our best investments over the past six months, by far, have been in bearish bets on companies such as Wachovia, Washington Mutual and Wells Fargo. Change of heart We recount this history not to pat ourselves on the back, but to provide context for our reversal on Wells Fargo (symbol WFC), the San Francisco-based banking giant. In fact, it marks only the second time in our careers that the share price of a company we had shorted fell so precipitously that it became a bargain worth buying. (The other case was Canadian insurer Fairfax Financial, which we still own today.) Advertisement The thesis for shorting Wells in January rested on two pillars. First, we thought Wells was buying some giant loan losses, especially in option ARMs and home-equity lines of credit, when it acquired Wachovia last October. Second, at close to $30, Wells's stock traded at three times estimated tangible book value, which we viewed as too high given the ill health of mortgage and credit markets. When the shares fell below $10 two months later, we saw a very different risk-reward scenario. That prompted us to change our position and buy the stock, even though we think there are still big losses to come on Wells's loans. Wells is in a race for its life. The company has set aside $23 billion as a provision for loan losses, but we estimate that even the low end of the range of eventual losses on its $865-billion loan book is more than $50 billion. Wells must earn profits fast enough to fill the hole being blown in its loan portfolio before those losses overwhelm the company. Can it do so? Our optimism that it can rests in no small part on the company's deserved reputation as a first-class operator. Advertisement Our confidence got a further boost when Wells announced exceptionally strong first-quarter earnings of $3 billion, driven by far lower charge-offs than we expected. Wells's net interest margin -- the amount by which interest income exceeds interest expenses, as a percentage of assets -- was 4.1% in the first quarter, significantly higher than the sub-3% margins reported in 2008 by Bank of America, Citigroup and JPMorgan Chase. Over the past five years, Wells has delivered annual earnings growth before taxes and loan-loss provisions of 11%, on average, while its nine largest peers have seen such earnings decline, on average. With the addition of Wachovia and assuming some cost savings, we believe Wells should earn $32 billion to $40 billion this year before taxes and loan-loss provisions. Those adjusted earnings, we believe, will meaningfully exceed additional provisions for credit losses in 2009. If earnings at least keep pace with loan losses, as we expect, Wells should survive the storm. If that happens and Wells doesn't have to raise additional capital -- we think there's only a 10% to 20% chance it will have to -- the $4 to $5 per share it should earn in a normal environment would translate into a stock worth $40 to $60. With the stock at $20 (as of April 9), we think the risk-reward equation is highly favorable. One last point: Our optimism about Wells Fargo is not a suggestion that all is clear for bank stocks in general. Wells is uniquely profitable, which should allow it to earn its way out of trouble. But many other banks won't be so lucky and will be overwhelmed by their losses. Columnists Whitney Tilson and John Heins co-edit Value Investor Insight and SuperInvestor Insight. Funds co-managed by Tilson hold short positions in Bank of America, Washington Mutual and Citigroup.