A few big money managers have increasingly dominated market share in the 401(k) business over the past few years, but the consolidation is expected to slow, an industry expert said.

Peter H. Starr, a consultant with Cerulli Associates Inc., Boston, said the companies that lead the market-such as Fidelity Investments, Vanguard Group, and State Street Corp.-are increasingly giving 401(k) participants access to other fund families.

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