By Jaspreet Singh and Supantha Mukherjee (Reuters) -Spotify founder-CEO Daniel Ek will step down to become executive chairman in January, the Swedish streaming company said on Tuesday as it adopts a new co-CEO structure in its strategy to fend off rivals and shore up its profit margin. Billionaire Ek, who built Spotify into a rare global consumer technology leader from the region, will step back from day-to-day business as the company charts out its plan to keep ahead of music offering from YouTube, Apple and Amazon. "Ek leaves the CEO role on a high note, with big boots to fill for the incoming CEOs," said PP Foresight analyst Paolo Pescatore. The U.S. shares of Spotify were down about 5% after gaining 63% this year. Ek, a prominent tech entrepreneur of Europe, will focus on capital alloc

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