Fidelity Investments, a Boston-based financial-services company that offers retirement savings products, is reporting defined contribution sales commitments representing $25.2 billion in assets under administration during the first half of 2012, up 36 percent from the total reported for the same period a year earlier.

Defined contribution products include 401(k) plans.

The first half of 2012 marked one of Fidelity’s strongest first half sales periods over the last five years, the company said.

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New defined contribution plans signed during the first half of 2012 included one for Kraft Foods that represents $6.2 billion in new assets under administration, said Fidelity, which added that it was also selected by the University of Washington to be the master administrator for its 27,000-participant retirement program.

In addition to new sales, Fidelity said it renewed more than $80 billion in business from existing clients in the first half of 2012.

Fidelity provides a wide range of financial services. As of June 30, it said it had assets under administration of $3.6 trillion, including managed assets of $1.6 trillion.