Prior to the stock split, Berkshire Class B shares did not have enough trading volume to make them eligible for inclusion in the S&P 500 market index. However, lowering the market price through the stock split put the stock into a more conventional trading range, where it became much more frequently traded. Berkshire Class B shares were added to the S&P 500 on February 12th, 2010, taking the spot previously held by Burlington Northern Santa Fe.
The nickname of Baby Berkshire follows the tradition of Baby Bells and Baby Bills.
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