Mid-day Movers (SFSF, SAP, KNXA, ARBA, AFFY, GCI)

Just after noon today, we’ve noted some stocks that are flying high. Companies involved in cloud software are getting a particular boost.

SuccessFactors Inc. (NASDAQ: SFSF) is up more than 51%, at $39.69, in a 52-week range of $19.46-$40.44. Volume is already about 35 times higher than average. The cloud software company has agreed to a takeover offer from SAP AG (NYSE: SAP) at $40/share, valuing the company at about $3.4 billion.

Kenexa Corp. (NYSE: KNXA) is up more than 14%, at $28.88, in a 52-week range of $13.96-$33.19. Volume is four times the daily average. Kenexa, like SuccessFactors, makes cloud-based software to assist corporate human resources departments.

Ariba Inc. (NASDAQ: ARBA) is up more than 12%, at $33.37, in a 52-week range of $21.35-$37.14. Volume is about 50% higher than the daily average. Ariba also provides a cloud-based sales solution.

Affymax, Inc. (NASDAQ: AFFY) is up more than 20%, at $6.32, in a 52-week range of $3.93-$8.50. Volume is about six times the daily average. The drug-maker got a favorable report from the US FDA on its experimental anemia treatment, which the agency said works as well as other already-approved treatments.

Gannett Co. Inc. (NYSE: GCI) is up more than 11%, at $13.24, in a 52-week range of $8.28-$18.93. Volume is approaching double the daily average. The news media company doubled its dividend in July and at least one analyst believes there is room for another raise, from $0.64 to $0.96 annually. The shares go ex-dividend on December 7th.