NEW YORK (

TheStreet Ratings

) -- TheStreet Ratings' stock model downgraded

Sears Holdings Corp

(SHLD)

to 'Sell' from 'Hold'. Net loss at this $7.8 billion market cap broadline retailer came in at $170 million compared to a profit of $16 million in the prior first quarter.

TheStreet Ratings released rating changes on 21 U.S. common stocks for May 19, 2011. In total, 10 stocks were upgraded and 11 stocks were downgraded by our stock model.

In the first quarter, Sears Holdings reported $9.7 billion in revenue, a decrease of 3.4% compared to the year earlier quarter. Learn more about Sears Holdings:

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Analyst Ratings

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$538 million market cap, restaurant,

Red Robin Gourmet Burgers

(RRGB) - Get Report

was upgraded by our stock model to 'Buy' from 'Hold'. In first quarter results, Red Robin Gourmet Burgers reported net profit of $8.7 million, up 75.9% from the year earlier quarter. Over the same time period, revenue gained 5.4% to $287 million. Learn more about Red Robin Gourmet Burgers:

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-- Reported by Kevin Baker in Jupiter, FL.

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Kevin Baker became the senior financial analyst for TheStreet Ratings upon the August 2006 acquisition of Weiss Ratings by TheStreet.com, covering equity and mutual fund ratings. He joined the Weiss Group in 1997 as a banking and brokerage analyst. In 1999, he created the Weiss Group's first ratings to gauge the level of risk in U.S. equities. Baker received a B.S. degree in management from Rensselaer Polytechnic Institute and an M.B.A. with a finance specialization from Nova Southeastern University.