Private Equity firm Thoma Bravo has announced the acquisition of security solutions firm Sophos. The deal, which was first announced in October last year is closed at $3.9 billion. Under the terms of the agreement, Sophos stockholders will receive $7.40 USD per share. The acquisition is expected to help Sophos continue to modernize the platform. Sophos currently partners with 53,000 resellers and managed service providers and counts more than 420,000 companies as customers. The platform currently helps protect 100 million users.