VMware has been on the hunt for acquisitions in recent months as the data center software maker looks to expand its security business, people familiar with the matter said.

VMware this summer held discussions with a security vendor, Carbon Black, about a possible acquisition, according to three people familiar with the matter. The talks ended without a deal, but they reflect VMware’s growing interest in complementing its cloud software with security products, which its customers often buy elsewhere. Carbon Black, based in Waltham, Mass., sells cybersecurity software for devices to businesses. Carbon Black was last valued at around $600 million.