Warren Buffett, having transformed Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B) from a little-known textile maker to a name-brand multibillion-dollar holding company, is beyond doubt one of history's greatest investors. 

He has a knack for picking quality companies and not overpaying for them. This is why checking out Berkshire Hathaway's latest major buys can serve as guidance for your own portfolio.

Buffett and company recently increased their position in the online bank Ally Financial (NYSE: ALLY) from just under 9 million shares to more than 30 million as of the second quarter. What was likely behind this move, and why should income and value investors consider buying Ally Financial for their portfolio? Let's dig in to find out. 

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Source Fool.com