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SEC Filings

6-K
TRIVAGO N.V. filed this Form 6-K on 10/24/2018
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Priceline.com and Agoda, accounted for 44% and 43% of our total revenue for the years ended December 31, 2017 and 2016, respectively.

For the three months ended September 30, 2018, brands affiliated with Expedia Group and Booking Holdings accounted for 32% and 44% of our total revenue, respectively, as compared to 34% and 45% of our total revenue, in the same period in 2017. For the nine months ended September 30, 2018, brands affiliated with Expedia Group and Booking Holdings accounted for 36% and 40% of our total revenue, respectively, as compared to 35% and 47% of our total revenue, in the same period in 2017.

Marketplace
We design our algorithm to showcase the hotel room rate offers that we believe will be of most interest to our users, emphasizing those offers that are more likely to be clicked and ultimately booked on our advertisers' websites. We consider booking conversion, which we describe in more detail below, to be a key indicator of user satisfaction on our website. At the core of our ability to match our users’ searches with large numbers of hotel offers is our auction platform, which we call our marketplace. With our marketplace, we provide advertisers a competitive forum to access user traffic by facilitating a vast quantity of auctions on any particular day. Advertisers do this by submitting hotel room rates on our marketplace and cost-per-click, or CPC, bids for each user click on an advertised rate for a hotel. By clicking on a given rate, an individual user is referred to that advertiser’s website where the user can complete the booking. Advertisers can submit and adjust CPC bids on our marketplace frequently - as often as daily - on a property-by-property and market-by-market basis, and provide us with information on hotel room rates and availability on a near-real time basis.

In determining the prominence given to offers and their placement in our search results, including in hotel comparison search results for a given location and on detail pages for a given property, our proprietary algorithm considers a number of factors in a dynamic, self-learning process. These include the advertiser’s offered rate for the hotel room, the likelihood the offer will match the user’s hotel search criteria, data we have collected on likely booking conversion and user experience (as reflected in our assessment of the quality of users' experience after clicking out to an advertiser from our website, which functions as an adjustment to advertisers’ CPC bids in our marketplace auction process, or relevance assessment) and the CPC bids submitted by our advertisers.

We believe the most influential factors impacting bidding behavior for our largest advertisers is the rate at which our Qualified Referrals result in bookings on their websites, or booking conversion, and the amount our advertisers obtain from qualified referrals as a result of hotels booked on their sites, or booking value. We refer to the degree to which we are able to share in the overall estimated booking revenues generated by our advertisers from our referrals as "commercialization". The quality of the traffic we generate for our advertisers increases when booking conversion and/or booking value increases. We estimate overall booking conversion and booking value from data voluntarily provided to us by certain advertisers to better understand the drivers in our marketplace, and in particular, to gain insight into how our advertisers manage their advertising campaigns. While we believe the quality of the traffic we referred to our advertisers improved in the third quarter of 2018, the information we used as the basis for this analysis is subject to a number of uncertainties, including those related to the accuracy of the information we receive from our advertisers and the methodologies we use to track and analyze whether a user ultimately completes a booking.

Assuming unchanged dynamics in the market beyond our marketplace, we would expect that the higher the potential booking value or conversion generated by a Qualified Referral and the more competitive the bidding, the more an advertiser is willing to bid for a hotel advertisement on our marketplace. This means that the levels of advertisers' CPC bids generally reflect their view of the likelihood that each click on an offer will result in a booking by a user. We believe our attribution model and product optimization measures have contributed to continuous improvement in our referred traffic quality, which would have had a positive effect on our referral revenues and revenue per qualified referrals, or RPQR. However, the dynamics in the market beyond our marketplace are not static, and we believe that our advertisers continuously review their

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