Alistair Berg/DigitalVision via Getty Images Ally Financial (NYSE:ALLY) is among the top 25 US banks based on assets and holds a market capitalization of approximately $12.7 billion. As a fully digital bank, Ally has received investments from no one less than the Oracle of Omaha, Warren Buffett, whose company owns 9.5% of the outstanding shares, and is the major shareholder. Nonetheless, when comparing the size of Berkshire's portfolio, the position is insignificant as it represents less than half of a perc ...