The magazines are being produced by , which won the brief after a competitive pitch.
The job will consolidate a number of smaller newsletters and magazines previously published by Grant Thornton, with the aim of making better quality and more distinctive publications.
'Elevate' is the title aimed at entrepreneurs, published twice a year. 'Bespoke' also comes out biannually and is aimed at private clients. Both are to be mailed out directly and supported with online content, generated by Seven Squared's digital arm.
Paul English, head of regions, markets and industries at Grant Thornton UK, said: "Seven Squared simply stood out in terms of the quality of their people, levels of commitment and generation of ideas.
"We look forward to working with them on these exciting new projects".
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