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BNI is a member of S&P 500 INDEX,RTH(SNP: ^GSPC), when takeover is final, S&P will have to add a 'new' member stock. Maybe is will be Berkshire
According to Wikipedia. The components of the S&P 500 are selected by committee. So it's not by a rules based system like the Russell 1000. http://en.wikipedia.org/wiki/S&P_500Lets hope the committee has had enough lead time to make up its mind quickly about inclusion.