Amazon's net more than quadrupled and sales jumped 41%, boosted by the final Harry Potter novel as well as shipping promotions. But concerns about profit margins sent shares down 8% after hours.

  AT&T reported a 41% jump in net, boosted by recent acquisitions and iPhone-driven strength in its wireless business.

  Oracle threatened to withdraw its $6.7 billion takeover offer for BEA Systems on Sunday. BEA rebuffed Oracle, but suggested it may be open to a higher bid. (Oracle's letter | BEA's response)

  Apple and Netflix shares climbed Tuesday, leading the Nasdaq up more than 1.5%, after the companies posted strong quarterly earnings. RIM surged on plans to enter the China market.

  Cisco agreed to pay $330 million for Navini Networks, a start-up that makes WiMAX equipment, shifting its stance on the wireless technology backed by Intel.

  Lexmark said it would close some operations in Mexico and move about 1,650 jobs to lower-cost countries, after the printer maker reported its net income fell 47%.

  MySpace unveiled a deal with Oberon Media to add a games section to its social network that will feature free, "causal" games.

  Hitachi will stop manufacturing the personal computers for home use that it sells only in Japan, amid stiff competition from domestic rivals.

  Federal prosecutors disputed charges by former telecom executive Nacchio that his company lost lucrative government contracts after he refused to cooperate with NSA requests.

  Karen Tandy is resigning as chief of the Drug Enforcement Administration to take a job as a senior vice president of Motorola.