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Widely Held Stocks in 401(k)s

Ticker: BRK.A

Berkshire Hathaway has become synonymous with the man at its helm:Warren Buffett. With his tried-and-true investment methods and a track record of success, a bet on Berkshire's stock can be synonymous with a bet on Buffett himself.

Of the top funds in retirement plans, Berkshire Hathaway Class A shares constitute about one half of 1 percent.