Yahoo! up

Yahoo! rose 2.5 percent to $18.14 after Greenlight Capital said it bought a stake whose size was not disclosed. Greenlight cited Yahoo!’s position in China-based Alibaba Group Holding.

AT&T coupons

AT&T, aiming to tap the billion-dollar mar ket for online coupons dominated by Groupon, will introduce its own discount site in about a month in Los Angeles, Atlanta and Dallas.

Sony attack

Sony says that hack ers may have taken per sonal data from 24.6 million user accounts in addition to 77 million accounts that were jeopardized by the re cent PlayStation Net work breach.

Treasury plans

The Treasury will probably keep the total of next week’s auctions of 3-, 10- and 30-year securi ties at $72 billion as the government approaches its debt limit.

Facebook suit

Facebook was sued in New York state for not getting permission to display that minors “like” Facebook adver tisers’ products.