BRK.A) has $34.46 billion in cash. While it is possible, the chance that Buffett would be satisfied simply standing by and watching his money pile continue grow in size is slim. In the past, he has clearly expressed his negative feelings towards the idea of holding cash as a long term investment. In an interview on the Charlie Rose Show, Buffett insisted that although Berkshire Hathaway always has enough cash around, he sees cash as always being a bad long-term investment. He went on to say that he is typically unhappy when he finds that there is excess cash available. Likening cash to oxygen, the legendary investor said it is important to know that it is around but unnecessary to have it in excess. Rather than have hoards of excessive cash on hand, he would rather own a strong business. A more likely scenario is that Buffett's massive cash reserves will be used to fund another big ticket purchase. Although the investor has tweaked the positions within his legendary investment portfolio on a number of occasions, he has not made a major purchase since Berkshire Hathaway announced that it was acquiring the remaining shares of Burlington Northern Santa Fe Railroad at the close of 2009. Finding a suitable purchase is not easy endeavor for the investor, however. The Burlington Northern purchase highlights the challenges Buffett faces when seeking out opportunities. Whereas Buffett could once generate strong returns by picking up small, undervalued companies, the pool of attractive investment opportunities has shrunk significantly as his firm has grown. Today, in order for a company to significantly impact Berkshire's performance, it must be large. The small, fast-moving companies that pocketed the investor staggering returns in the past would barely make a dent in Berkshire.