Expedia Inc. is exploring an initial public offering of German hotel booking site Trivago, in which it owns a stake.

Trivago’s founders have agreed to look into taking the company public, according to Expedia’s second-quarter earnings release on Thursday. If Trivago were to go public, Expedia doesn’t currently plan to sell any of its shares.

Expedia first bought into Trivago in 2012, paying about $628 million in cash and stock for 61.6 percent of the company. The acquisition was part of a push by Expedia to expand its presence in Europe.

Trivago posted revenue of $201 million in the second quarter, up 41 percent from the same period a year earlier, according to Thursday’s release.

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