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What is this fund?
SMID CAP FUND is Fidelity's way of saying SMALL to MID CAP FUND.  Small to Medium is self explanatory.  Cap is capitalization, and it basically means how much the sum of all the existing shares of the company are worth.  Fidelity names the funds inside their 401k plans according to who provides the fund.  They also provide management resources for funds chosen by your employer. There should be more available about the fund you're interested in on your Fidelity 401(k) site.