RightNow’s shares rose 19 percent in premarket trading.
Oracle has been stepping up its push to provide customers a range of services remotely through cloud technology including sales force automation, human resources and databases.
Oracle said on Monday it would pay $43 for each share of RightNow. The company’s shares, which closed at $35.96 on Friday, rose to $42.87 in premarket trading on Monday.
Oracle said it expects the deal to close in late 2011 or early next year.
Rightnow may be required to pay Oracle a termination fee of around $60 million if it accepts a higher bid from another party. The termination fee could be around $18 million if the deal is terminated under certain other cases.
RightNow, which competes with much larger rival Salesforce.com in offering cloud-based customer services software, has benefited from a cycle in which more of its customers are looking to replace on-site software with cheaper Web-based products. Cloud computing allows companies to store data on remote servers.
In July, the company raised its full-year recurring revenue growth outlook to 27 percent from a previous 24 percent.
The company was started by Chief Executive Greg Gianforte 15 years ago and over 2,000 organizations use its software.