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Does dividend on 401K have any effect on gains
It appears from your description that the 401k account has the automatic dividend reinvestment policy, and that the end result is exactly the same as the external account with the same policy. I.e.: no difference, the dividend affected the 401k account in exactly the same way it affected the external account. The only thing is that for external account you can take the dividend distribution, while for 401k you cannot - it is reinvested automatically. Were you expecting something else?