Fidelity Investments announced Thursday that assets and the number of its Advisor 401(k) plans, designed for small- and mid-sized employers, increased in 2005. Assets increased 16% over the year before, to $13.5 billion, while the number of new plans Fidelity signed up rose 44%, to 380, bringing the total number of plans using Fidelity's Advisor 401(k) services to 2,176.

This year, Fidelity is hoping that new 401(k) features will continue to drive the business, including automatic enrollment, on-site education for advisers and their clients, benchmarking information and retirement readiness and action plan tools.

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