The cloud-based software maker announced Wednesday it would buy Demandware, which provides software to design e-commerce websites, for about $2.8 billion.
"This was a very competitive deal. This was very hard," he told CNBC's "Squawk on the Street."
"We've never seen more deals and more things happening. We're not winning every deal. This is just a deal we were actually able to get done," he said.
Benioff said companies are positioning for growth next year, making it tough to close deals.