down 18% Oct 25 Shares of FormFactor (FORM) took a beating Thursday, after the company revealed that it was reviewing its inventory valuation practices and warned of possible financial restatements. The Livermore, Calif., company reported only partial results for its third quarter due to the accounting review, posting 29% year-over-year growth in its top line of $125.3 million. The stock hit a 52-week low.

down 19% Oct 25 NII Holdings (NIHD) was plummeting 19.8% after the Latin American digital wireless communications provider beat Wall Street's third-quarter outlook, but reported slowing subscriber growth. The company reported adjusted net income of $104 million, or 61 cents a share, on revenue of $853 million. Analysts were expecting earnings of 53 cents a share on revenue of $847 million. NII reported 327,000 net subscriber additions, bringing its total digital subscriber base to 4.4 million, up from 3.2 million this time last year. That's a little bit slower than expected -- NII blamed hurricanes in Mexico -- and the company acknowledged it "has some ground to make up" to reach its guidance of 1.275 million net subscriber additions for the year. The company's churn rate also increased to 1.6% from 1.5% in the year-ago period. The stock hit a 52-week low.

down 63% Oct 25 WellCare (WCG) shares lost as much as two-thirds of their value on Thursday following a government raid of its offices. The government has launched a massive investigation of the company, which supplies health insurance coverage exclusively to Medicare and Medicaid recipients. Among others, the Federal Bureau of Investigation and the Medicaid fraud unit for the state of Florida - the company's largest market - participated in the sweep. So far, few details have emerged. However, because the probe involves both federal and state authorities, it could threaten WellCare's Medicare and Medicaid businesses alike. The stock hit a 52-week low.

down 27% Oct 25 Triad Guaranty (TGIC) plummeted 26.61% to $6.04 after "rapid deterioration of the housing markets" helped pressure a loss of $31.8 million, or $2.13 a share, to reverse a year-ago profit. Also, a surprise September rise in new-home sales, per the Census Bureau, was countered by a congressional report that forecasted some 2 million subprime mortgage foreclosures by the end of 2008. The stock hit a 52-week low.

down 28% Oct 25 Marine transportation firm American Commercial Lines (ACLI), of Jeffersonville, Ind., also came in well below estimates for the third quarter. That pulled shares down 28%. The stock hit a 52-week low.

down 24% Oct 25 A surprise September rise in new-home sales, per the Census Bureau, was countered by a congressional report that forecasted some 2 million subprime mortgage foreclosures by the end of 2008. Among the losign mortgage stocks was Radian (RDN), which fell 23%. The stock hit a 52-week low.

down 11% Oct 25 Comcast's (CMCSA) gleaming image shatters as competition drags the cable giant into a price scuffle. The Philadelphia cable shop cut its cash flow target for the year as phone companies and satellite players show they can pick off Comcast customers more easily than expected. Suddenly the sales growth in new services like broadband and phone has slowed. The number of new services sold or revenue generating units fell to 1.4 million, down from 1.5 million last quarter. The stock hit a 52-week low.

down 15% Oct 25 MBIA Insurance (MBI) swung to a net third-quarter loss and posted slipping operating income of $1.52 a share, which missed the average analyst estimate by 7 cents. The stock hit a 52-week low.