Financial terms of the transaction were not disclosed, though a statement released by Quark hints at the company using the investment to purchase other companies and technologies to bolster its product range.
One potential target could be Aquafadas, which developed the technology behind Quark's still-forthcoming magazine-app publishing solution App Studio.
'The Platinum operations team is working together with the Quark management team to focus on Quark's core markets and create an acquisition strategy focused on expanding the breadth and depth of Quark's product capabilities and geographic coverage,' says a press release from Platinum Equity.
According to Raymond Schiavone, president and CEO at Quark, the transition comes at an exciting time for the company and its customers.
"In the past few years we have made great strides in helping our customers realise dynamic publishing, have re-invigorated QuarkXPress, and are ready to take an early leadership position in digital publishing,"he said.
"Platinum Equity is well-positioned to help us continue to execute our dynamic publishing vision through their market reach, merger and acquisition experience, and operational support. This is the natural next step for Quark's evolution."