NEW YORK -- J.C. Penney's ( JCP) fourth-quarter loss widened from a year earlier as sales plunged almost 30%. The department store chain on Wednesday posted a quarterly loss of $552 million, or $2.51 a share, wider than the year-earlier loss of $87 million, or 41 cents a share. The adjusted loss in the period was $1.95 a share; analysts forecast a loss of 18 cents a share. Fiscal fourth-quarter revenue fell 28.4% to $3.88 billion and same-store sales fell 31.7%. Analysts expected the retailer to post revenue of $4.09 billion. Why Best Buy Should Love and Embrace Amazon.comGroupon ( GRPN), the daily deals company, missed Wall Street's fourth-quarter earnings estimates. Groupon reported on Wednesday a fourth-quarter adjusted loss of 5 cents a share on revenue of $638.3 million. Analysts were looking for earnings of 3 cents a share on revenue of $638.4 million. Operating cash flow in the quarter plunged 61% to $65.7 million from $169.7 million in the fourth quarter of 2011. The company provided first-quarter guidance that was sharply below Wall Street expectations. Groupn expects sales to be between $560 million and $610 million, a year-over-year increase of between 0% and 9%. Wall Street analysts are expecting sales of $647.7 million. Groupon Sinks as Cash Flows PlungeSears ( SHLD) is expected by analysts Thursday to post fourth-quarter earnings of 98 cents a share on revenue of $11.77 billion. Kohl's ( KSS) is expected by Wall Street to post fourth-quarter profit of $1.63 a share on revenue of $6.24 billion. Act Two of This Week's Retail Earnings The Securities and Exchange Commissioner has escalated an investigation into suspicious trades placed ahead of the $23 billion takeover of H. J. Heinz ( HNZ), focusing on a complex derivative bet routed through London, The New York Times reported, citing two people briefed on the matter. Wall Street expects software company Salesforce.com ( CRM) to report quarterly earnings of 40 cents a share when it issues its results after the markets close Thursday. Wal-Mart's ( WMT) chief administrative officer, Tom Mars, is steeping down after working for the giant retailer for more than a decade. -- Written by Joseph Woelfel >To contact the writer of this article, click here: Joseph Woelfel >To submit a news tip, send an email to: email@example.com.