The company has renewed its contract with the book printing operation Clays, but the deal with the rest of St Ives represents a wholly new contract, won from the incumbent Paperlinx.
The agreement includes product supply, technical support and rationalisation of the grades used by the group.
Paul Tasker, divisional director for PMS, a division of Antalis McNaughton, said: "We are delighted to be the preferred supplier to the St. Ives Group and to be supplying them with papers from leading manufacturers such as Sappi and Stora Enso.
"Our experience and investment in paper management and the book publishing industry makes for a strong partnership."
St. Ives group commercial director Ivor Watters added: "We are very convinced by PMS, and we look forward to realising genuine value from our partnership."