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SEC Filings

6-K
TRIVAGO N.V. filed this Form 6-K on 04/25/2018
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For the three months ended March 31, 2018, brands affiliated with Expedia Group and Booking Holdings accounted for 38% and 38% of our total revenue, respectively, as compared to 37% and 45% of our total revenue, respectively, in the three months ended March 31, 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 either or both booking conversion and booking value increase. 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.
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 the measures aimed at optimizing our product, described in more detail below, have contributed to increased quality of the traffic we generated for our advertisers, and, accordingly, absent other factors, would have had a positive effect on our referral revenues and revenue per qualified referral, or RPQR. However, the dynamics in the market beyond our marketplace are not static, and we believe that our advertisers continuously review their advertising spend on our platform and on other advertising channels, and continuously seek to optimize their allocation of their spending among us and our competitors.
In addition, changes in foreign exchange rates can amplify or mute changes in these underlying trends in our revenues and RPQR. Although we denominate our CPCs in euro and have relatively little direct foreign currency translation with respect to our revenue, we believe that our advertisers’ decisions on the share of their booking revenues they are willing to pay to us are based on the currency in which the hotels being

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