Mesh Computers general manager Tony Riccardi is leaving the system builder after 15 years to move into the distribution market with CMS Peripherals.
He is due to roll up at London-based wholesaler CMS as retail business unit manager on 23 August.
In a statement sent to MicroScope, Riccardi said he was "looking for a new challenge" but revealed Mesh does not have a direct replacement lined up just yet.
"Mesh's board will evaluate the situation over the next few weeks and recruit any additional personnel they feel are needed," he said.
His departure coincides with that of sales and customer service manager Krish Patel, who also left Mesh this month after more than six years at the firm, to join renewable energy specialist HomeSun.