Investment firm Blackstone (NYSE: BX) is buying a majority stake in Accuvant Inc. for an undisclosed amount.

Denver-based Accuvant provides information security services, plus monitoring and post-intrusion detection and remediation services. The company expects the deal to allow it to expand more quickly.

Accuvant management and existing shareholder Sverica International LLC, a Boston private equity firm, will invest alongside Blackstone in the transaction.  Blackstone is investing through a private equity fund.

Blackstone, headquartered in New York, has made other recent technology investments including Pactera Technology International Ltd., an information technology outsourcing company, and Kronos, a workforce management software group.

Sverica invested in Accuvant in 2008. Under the firm's ownership, Accuvant added cyber-security company Ciphent to the group in 2010.

Simpson Thacher & Bartlett LLP and Blackstone Advisory Partners LP advised Blackstone on the deal. 

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