NEW YORK -- A special committee of Dell's ( DELL) board is evaluating separate takeover bids for the world's No. 3 PC maker from Blackstone Group ( BX) and Carl Icahn, according to reports over the weekend. Founder Michael Dell and a group of investors, including private-equity firm Silver Lake, announced a $24.4 billion bid for the PC maker in February. Friday marked the end of a 45-day period that Dell's board set to allow for offers that might top that deal to take the company private. Icahn has offered $15 a share for 58% of Dell, while Blackstone has proposed paying more than $14.25 a share, a source told Reuters. Michael Dell and the Silver Lake group had agreed to buy all of Dell for $13.65 a share. Dell could make an announcement as soon as Monday about whether the rival offers might lead to a superior bid, the source told Reuters. BlackBerry ( BBRY) shares fell 7.7% to $14.91 on Friday, the day the company launched the BlackBerry Z10 smartphone in the U.S. Raymond James analyst Tavis McCourt said despite BlackBerry seeing some positive data on initial demand for the BlackBerry 10 platform, competition is increasing, and fast, from rivals Samsung, Apple ( AAPL), HTC and Nokia ( NOK). Apple Jumps, BlackBerry Bends: Tech Winners & LosersDollar General ( DG), the discount retailer, is expected by analysts Monday to report fourth-quarter profit of 90 cents a share on revenue of $4.26 billion. Apollo Group ( APOL), the for-profit education company, is forecast by Wall Street to post on Monday fiscal second-quarter earnings of 18 cents a share on revenue of $822.8 million. 5 Stocks Ready to Break OutSonic ( SONC), the drive-in restaurant chain, is expected to post fiscal second-quarter earnings of 5 cents a share on revenue of $112.7 million. -- Written by Joseph Woelfel >To contact the writer of this article, click here: Joseph Woelfel >To submit a news tip, send an email to: firstname.lastname@example.org.