Oracle (ORCL) is in talks to buy Micros Systems (MCRS) which makes software for retailers and hotel chains, for more than $5 billion, Bloomberg reported citing people familiar with the matter.
While the companies are in exclusive talks, they could still fail to reach an agreement, the report said.
Micros shares were up 16 percent at $67.10 in early afternoon trading on the Nasdaq. Oracle shares were up 1 percent at $42.61.
Micros Systems makes point-of-sale hardware and software for restaurants and hotels.
Oracle declined to comment, while Micros couldn't be immediately reached for comment.
FBR Capital Markets analyst Daniel Ives said Oracle's rivals could offer a higher bid to drive up the price.
"We believe the most likely candidates would be SAP or IBM, which offers WebSphere, its own enterprise class e-commerce platform," FBR Capital Markets analyst Daniel Ives said.
A deal will let Oracle stave off threat from software-as-a-service e-commerce vendors such as Demandware (DWRE) and NetSuite (N), Ives said.
The company has also reorganized its sales team to catch up with rivals such as Salesforce.com (CRM), SAP (SAP) and Workday (WDAY).
Smaller, aggressive companies like Salesforce.com and Workday have often undercut Oracle's pricing with competitive software and Internet-based products.
Four-decade-old Oracle's strategy is to integrate software with its own high-end, expensive hardware for greater efficiency.
Chief Executive Officer Larry Ellison has said he plans to compete aggressively against rivals offering cloud-based technology infrastructure services, like Amazon.com (AMZN) and Rackspace Hostings (RAX).
Oracle reported quarterly revenue and profit that failed to satisfy investors looking for signs of a sustained turnaround and forecast in-line current-quarter results in March. The company is expected to report fourth-quarter results on June 19.
The deal, if confirmed, would be Oracle's largest acquisition since it bought Sun Microsystems for $5.6 billion in 2009.