SuccessFactors shares increased over 50% to $39.71 following the announcement of the company's takeover by SAP AG, software developer, for $3.4 billion, or $40 a piece. Meanwhile, SAP AG shares lost 35 cents to $59.19. Other tech companies also experienced gains, Taleo Corp.'s shares increased by 18% to $39.04, Salesforce.com Inc. gained 5% to $125.97 and Oracle Corp. edged up 2% to $31.98.