Private equity firm the Riverside Co. has invested in Brookson Group Ltd., which provides office services.

Brookson, headquartered in Warrington, England, provides tax management, invoicing, cash management and financial back-office services to self-employed contractors and small businesses. The company provides services through cloud-based software called Brookson Connect, which provides users data on financial and management information. Terms of the transaction were not disclosed.

Riverside expects the company to expand its services geographically and through add-on acquisitions.

Cleveland and New York-based Riverside has been especially active in 2014. Earlier this month, the firm invested in Alcohol Monitoring Systems Inc., which provides electric monitoring technology to criminal justice groups to monitor alcohol and criminal offenders. Before that, on Dec. 10, the firm purchased Intellifuse Coating Technologies, and excited Disa Global Solutions. 

Grant Thornton advised Riverside on the deal.