Mid-market private equity firm Livingbridge has invested £23m in Exclaimer, a global provider of email signature software.
The investment is the last primary investment from Livingbridge 5, the firm's £360m fund raised in 2012.
Exclaimer, headquartered in Farnborough, Hampshire, was founded in 2000 by business partners Andrew Millington, Gary Levell and Chris Crawshay and today provides software to over 25,000 customers in more than 100 countries including blue-chip firms such as the BBC, Audi, Sony and McDonalds.
The Group is an accredited Microsoft Gold partner and its products support the full range of Microsoft's email solutions including MS Office 365.
Exclaimer's software gives users flexibility and control over email signatures and disclaimers, ensuring regulatory compliance while enabling consistent brand promotion and innovative marketing campaigns.
The investment will see the business invest in expanding relationships with partners, add scale by broadening its suite of products and invest further in infrastructure and customer services.
Millington, CEO, Exclaimer, said: "In the last 16 years we have taken a very simple concept and turned it into a global success.
"The investment from Livingbridge will enable us to push on even further, adding scale and firepower to our business while still maintaining our entrepreneurial culture of innovation."
Matthew Caffrey, Partner at Livingbridge said: "Our experience of working with high growth tech businesses, combined with Exclaimer's strong management team and award winning reputation, means that the business is extremely well placed to capture the opportunity that the rapid expansion of MS Office 365 brings."