Private equity giant Thoma Bravo has offered to purchase Sophos for $3.82 billion less than four and a half years after the SMB platform security stalwart went public. Thoma Bravo, with ...

Sophos potentially will walk away from the public market just four and a half years after its initial public offering following the $3.82 billion purchase offer from private equity giant Thoma Bravo.

Popular antivirus programs are Norton, McAfee, Sophos, Bitdefender, AVG and Kaspersky. Microsoft Defender is Microsoft's own antivirus software that comes with Windows, starting with Windows 8.