The agency has recruited Samantha Jones to the post of account manager. Jones previously held the same title at Imagination, where she worked primarily on the Mazda account.
Jones will work with Canon, telecoms company RIM, Vodafone and BT among other clients.
"I joined Adding Value because I was keen to diversify and work on client projects in various sectors, rather than with just one client," said Jones.
Leeds Metropolitan University graduate Natasha Schofield has been appointed to the role of project manager, with a focus on production.
And Rosie Ranford has joined Adding Value as an event assistant.
Adding Value Events managing director Tina Morris said the new staff had joined at a "crucial time in Adding Value's growth".