Fidelity Investments announced that it plans to lay off about 250 employees as part of a restructuring of some of its units.

Ann Crowey, a spokeswoman for the Boston mutual fund company, said last week that the company plans to reduce staff by about 100 people in Massachusetts. The rest of the layoffs are spread out across the country.

The layoffs are being made in Fidelity's technologies division and two merging units that handle 401(k) retirement plans, savings accounts, and health care arrangements for corporate clients, the company announced. Fidelity has about 46,500 employees, including 12,700 in Massachusetts, and about $1.6 trillion of assets under management as of Dec. 31.

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