State Street Corp. plans to launch a Web-based service in January to help sponsors compare their pension plans' returns with those of similar plans and portfolios.

Sponsors will be able to measure performance against a data base of about 160 plans and more than 5,000 portfolios, the company said.

Results will be available monthly for a range of investment styles, plan types, and portfolio sizes. Names of companies will not be released without approval.

"It's really giving them direct access on a very timely basis to help them do their jobs," said Laurette M. Bryan, a senior vice president who heads State Street's pension consulting business.

State Street, which is based in Boston, has $459 billion of assets under management.

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