The agency will take over sizeable contracts in the crime reduction education and employment association sectors.
Mosaic has doubled its turnover in the past 12 months and gained wins recently from the Historical Association, the National Association for Safety and Health in Care Services, Osiris Educational and the National Association for the Teaching of English.
The clients have appointed Mosaic to deliver event management and income generation services.
Sarah Byrne, director of Mosaic Events, which is celebrating its tenth anniversary this year, said: "Jorvik’s association-heavy client base makes it an excellent fit with Mosaic’s growth strategy."
Byrne believes it is innovation that has driven the recent growth at Mosaic. She said: "Over the last year we have developed an effective income-generation solution for associations which delivers greater returns for events. In one example, this approach has increased annual revenues for the client three-fold on the previous year.
"So by tweaking the business slightly we have been able to create more value and measureable return-on-investment for clients, leading to growth for Mosaic."
Jorvik director Stewart Moss, who established the company in 2006, is taking up a new senior role in hotel general management.