Oracle is in talks to buy Micros, 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% at $67.10 in early afternoon trading on the Nasdaq. Oracle shares were up 1% at $42.61.
Micros makes point-of-sale hardware and software for restaurants and hotels.
Oracle declined to comment, while Micros could not 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," Ives said.
A deal will let Oracle stave off threat from software-as-a-service e-commerce vendors such as Demandware and NetSuite, Ives said.
Oracle has been rolling out its own cloud-based products and acquiring smaller cloud companies, such as marketing software maker Responsys.
The company has also reorganised its sales team to catch up with rivals such as Salesforce, SAP and Workday.
Smaller, aggressive companies like Salesforce 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.
CE Larry Ellison has said he plans to compete aggressively against rivals offering cloud-based technology infrastructure services, like Amazon and Rackspace.
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 19 June.
The deal, if confirmed, would be Oracle's largest acquisition since it bought Sun Microsystems for $5.6 billion in 2009.
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