The private equity arm of Susquehanna International Group, the US financial services firm, has acquired a natural food company one day after organic grocer Whole Foods Market acquired a rival chain.

SIG Strategic Investments has acquired the assets of US Mills for an undisclosed amount. US Mills sells and distributes a wide variety of all natural, organic and whole grain food products across the US, Canada and Puerto Rico including ready-to-eat cereals, granola bars and cookies.