Beazer Homes ( BZH) plunged more than 16% in extended trading Tuesday after Business Week reported that several federal agencies had begun a joint criminal investigation into the Atlanta-based homebuilder's mortgage-lending practices. Shares were tumbling $5.09 to $26.32 in after-hours trading.

iMergent ( IIG) jumped 7.3% after the Orem, Utah, e-commerce company lifted its fiscal 2007 guidance, now estimating the net dollar volume of its executed contracts to surge 45% to 50% year over year -- meaning between $144.7 million and $149.7 million. The prior outlook called for 40% growth to $139.7 million. Shares were rising $1.41 to $20.75.

Accenture ( ACN) rose after the Bermuda-based management-services firm said fiscal second-quarter operating income more than quadrupled to $559.4 million from a year ago. Net earnings spiked to 47 cents a share from 11 cents a year ago, and revenue climbed 15.1% to $5.17 billion -- toppling the $4.69 billion consensus, according to Thomson Financial.

The company also added 8 cents a share to its fiscal 2007 earnings outlook, now foreseeing between $1.88 and $1.93 in per-share profits. Accenture stock was gaining 86 cents, or 2.4%, to $37.08.

Arrow International ( ARRO) slid on below-par results for the quarter ended Feb. 28. The medical-products maker said it made $14.5 million, or 32 cents a share -- higher than last year's 28 cents a share, but 4 cents short of the mean Street target. Revenue came to $125.4 million, a modest rise from last year that missed the $128.6 million consensus. Shares of the Reading, Pa., company were slumping $1.72, or 5%, to $32.40.

AngioDynamics ( ANGO), another medical-device maker, swung to a GAAP-based loss of 55 cents a share for the quarter ended March 3. Year-ago profits had totaled 14 cents a share. Revenue, at $26.7 million, was $1.7 million below estimates. Shares were off 85 cents, or 3.8%, to $21.75.

Technology-products distributor Synnex ( SNX) slipped after its Canadian subsidiary agreed to pay about $38.9 million for Redmond Group of Companies, a consumer-electronics distributor. The deal should close on or around April 30. Shares of the California-based company were down 47 cents, or 2.2%, to $21.49.