The stock's addition to the S&P 500 makes the chain even more attractive.
Despite the recent pullback, it's the go-to stock in the deep-discount retail niche.
These are the top purchases of the Oracle of Omaha during the third quarter.
From Costco on one end to Dollar Tree on the other, there's no shortage of rivals looking to take the retailing giant's business.
These were not the only changes to Warren Buffett's holding company's portfolio.
The market is overbought and very expensive, but some areas still offer potential growth.
Potash is downgraded to 'neutral,' while Agrium is upgraded to 'buy.'
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