Finsbury is working Thoma Bravo investment firm’s $3.9B offer for Sophos Group, the UK-based cyber and network security software developer.

The San Francisco equity outfit’s $7.40 per-share offer represents a 37 percent premium over Sophos’ closing last week on the London Stock Exchange.

TB ranks among the most active private equity firms in the software space, making more than 200 deals with an aggregate over $50B in enterprise value.

Seth Boro, managing director, said TB is looking forward to partnering with Sophos’ management team and employees to further develop the company as a “best-in-class software franchise and nextgen security leader.”

He believes TBs “expertise, operational framework and experience” can accelerate Sophos’ evolution and growth.

Finsbury’s Edward Simpkins and Faeth Birch represent TB, while Tulchan Communications’ Matt Low, Harry Cameron, Sunni Chauhan and James Macey White handle Sophos.