Shares of

Blue Nile

(NILE)

dropped 17% in late trading Tuesday after the online jewelry retailer's fourth-quarter earnings and 2006 outlook missed expectations. The company posted earnings of $5.3 million, or 29 cents a share, up from $4.6 million, or 24 cents a share, a year earlier. Fourth-quarter sales totaled $73.2 million, up from $64.5 million a year earlier. Analysts polled by Thomson First Call were expecting earnings of 33 cents a share and sales of $80.3 million.

For 2006, Blue Nile sees earnings of 62 cents to 72 cents a share, including 14 cents to 16 cents in options costs. Analysts predict earnings of 99 cents a share before options. The company forecast sales of $220 million to $245 million, below Wall Street's target of $258 million. Shares of Blue Nile fell $6.41 to $30.88 in after-hours trading.

Encore Wire

(WIRE) - Get Report

shares surged after the maker of copper electrical wire posted fourth-quarter numbers that blew past estimates. Net income soared to $35.4 million, or $1.50 a share, from $6.4 million, or 27 cents a share, a year earlier. Sales jumped 66% to $244.2 million from $147.5 million, aided by higher wire prices. According to Thomson First Call, analysts expected earnings of 35 cents a share and revenue of $179 million. The company said margins were helped by solid copper pricing and the pass-through of costs on to customers. Encore Wire shares rose $5.79, or 20%, to $34.72 in late trading.

Shares of

Kforce

(KFRC) - Get Report

lost ground after the staffing services company forecast first-quarter earnings that could fall below Wall Street's target. For the fourth quarter, the company's earnings dropped to $6.9 million, or 17 cents a share, matching analyst estimates. A year earlier, the company reported earnings of $17.6 million, or 45 cents a share, including a $12.6 million tax gain. Kforce's revenue rose to $203.6 million from $190.2 million a year ago, shy of analysts' forecast of $207.7 million.

Kforce predicted first-quarter earnings of 11 cents to 14 cents a share, including higher payroll taxes and costs related to a recent acquisition. The company sees revenue of $222 million to $228 million. Analysts forecast earnings of 14 cents a share and revenue of $213 million. Kforce slipped $1.07, or 8%, to $12.10 in after-hours trading.

Shares of

Intevac

(IVAC) - Get Report

gained 17% after the disk-sputtering equipment maker handily beat Wall Street's fourth-quarter earnings expectations. The company posted income of $9.9 million, or 46 cents a share, compared with a year-earlier loss of $3 million, or 15 cents a share. Analysts were looking for earnings of 39 cents a share. Revenue jumped to $52.7 million from $10.4 million a year earlier, and beat Wall Street's projection of $51.1 million. Shares advanced $2.95 to $20 in late trading.

Adolor

( ADLR) shares jumped 23% after the company, along with partner

GlaxoSmithKline

(GSK) - Get Report

, announced positive results from a phase III study of the drug Entereg. The product is being studied for the treatment of postoperative ileus, an obstruction of the intestines. The study of 654 patients undergoing bowel resection surgery showed that a 12-milligram dose of Entereg was quicker than placebo in helping to recover gastrointestinal function, Adolor said. The company said it believes the data address the Food and Drug Administration's request for additional information, which the agency outlined in an approvable letter in July. The company plans a complete response to the FDA by June. Adolor shares gained $3.74 to $19.50 in after-hours trading.