Warren Buffett is building the Noah's Ark of rainy-day funds. Here's why he's stacked up more than $300 billion.

Warren Buffett is building the Noah's Ark of rainy-day funds. Here's why he's stacked up more than $300 billion.

REUTERS/Rick Wilking

Warren Buffett has been selling shares and stacking up cash at a terrific rate, fanning speculation as to why the world's foremost stock picker is pulling his money out of the market.

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