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Why doesn't a mutual fund in my 401(k) have a ticker symbol?
That share class may not have a ticker symbol though "Black Rock MSCI ACWI ex-US Index" does have a ticker for "Investor A" shares that is BDOAX.  Some funds will have multiple share classes that is a way to have fees be applied in various ways.  Mutual fund classes would be the SEC document about this if you want a government source within the US around this. Something else to consider is that if you are investing in a "Fund of funds" is that there can be two layers of expense ratios to consider.  Vanguard is well-known for keeping its expenses low.