For the fourth consecutive year, Booking.com reigns supreme as the most popular booking site for hotels around the globe.
Hotel industry cloud platform SiteMinder has revealed its list of the top 10 booking sites for hotels in 2015 based on total gross booking revenue facilitated through SiteMinder's Channel Manager.
Data was collected for SiteMinder's hotel customers in the U.K., Spain, Germany, Australia and Thailand.
Here's how the overall top 10 shook out for 2015, courtesy of SiteMinder.

"This list captures the distribution channels that led the industry in providing one the most critical measures for a hotel's success today - its online revenue," SiteMinder Co-founder and Managing Director Mike Ford said in a statement.
Booking.com led in each of the five aforementioned regions, with Expedia coming in No. 2 in three out of the five regions. HRS was No. 2 in Germany, while Agoda.com came in second in Thailand last year.
SiteMinder's TheBookingButton was most popular in the U.K. and Austrailia, coming in third for 2015 in both regions.
"Around $11 billion worth of online revenue has passed through SiteMinder's technology over the past year," added Ford. "This has been via both the third-party booking sites and Internet booking engines SiteMinder's Channel Manager integrates with."
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