Tuesday's Winners & Losers: ComScore

Shares of ComScore(SCOR Quote) were down $5.72, or 20.7%, to $21.98 after Google(GOOG Quote) introduced a free media planning tool for advertisers called Ad Planner which gives ad buyers information about sites that their audience is most likely to visit.

Wachovia(WB Quote) also provided a spark to the sector, as reports emerged that the Charlotte, N.C.-based bank hired investment bank Goldman Sachs(GS Quote) to advise it of its options on its decimated loan portfolio. Wachovia said that Goldman will "perform analytics on our loans to evaluate various alternatives." Wachovia jumped 5.3% to $17.82 and Goldman rose 2.2% to $182.47.

Virgin Mobile(VM Quote) lost 45 cents, or 13%, to $3 after it said it will offer unlimited calling for $79.99 a month. The plan is lower than that rivals AT&T(T Quote) and Sprint's(S Quote).

UBS(UBS Quote) shares enjoyed a boost from takeover rumors on Tuesday. The stock gained 6.7% in heavy volume to $21.98 on unconfirmed reports that HSBC Holdings(HBC Quote) would make a bid for the bank. HSBC was only up 10 cents to $79.14 on the news.

Ixys(IXYS Quote) gained 4.8% to $12.00. The Santa Clara, Calif., technology company, which specializes in semiconductors, expanded its Schottky diode product line in an effort to offer high-power density for portable products.

Advanced Energy Industries(AEIS Quote) was up 6.2% to $14.58. The Fort Collins, Colo.-based technology company develops and produces plasma-based manufacturing processes. Today, Goldman Sachs upgraded AEIS to buy from neutral in a sector note.