TRVG trivago NV

Item 1. SECURITY AND ISSUER

This Statement on Schedule 13D relates to the Class A Shares (the “ Class  A Shares ”) of trivago N.V. (the “ Issuer ”) that are held directly by PAR Investment Partners, L.P., a Delaware limited partnership (“ PAR Investment Partners ”), through American Depositary Shares, each representing one Class A Share. The address of the Issuer’s principal executive office is Bennigsen-Platz 1, 40474, Düsseldorf, Germany. Information given in response to each item shall be deemed incorporated by reference in all other items, as applicable.

Item 2. IDENTITY AND BACKGROUND

(a), (b) and (c) This statement is being filed by the following persons: PAR Investment Partners, PAR Group, L.P., a Delaware limited partnership (“ PAR Group ”), and PAR Capital Management, Inc., a Delaware corporation (“ PAR Capital Management ”). PAR Investment Partners, PAR Group and PAR Capital Management are sometimes individually referred to herein as a “ Reporting Person ” and collectively as the “ Reporting Persons .”

The principal business of PAR Investment Partners is that of a private investment partnership engaging in the purchase and sale of securities for its own account and its address is 200 Clarendon Street, 48 ^th Floor, Boston, MA 02116. The sole general partner of PAR Investment Partners is PAR Group. The principal business of PAR Group is to act as the general partner of PAR Investment Partners and its address is 200 Clarendon Street, 48 ^th Floor, Boston, MA 02116. The sole general partner of PAR Group is PAR Capital Management. The principal business of PAR Capital Management is to act as the general partner of PAR Group and its address is 200 Clarendon Street, 48 ^th Floor, Boston, MA 02116.

Paul A. Reeder, III is the President and sole director of PAR Capital Management and each of Frederick S. Downs, Jr., Arthur G. Epker, III, Edward L. Shapiro, Steven M. Smith, Michael J. Tucker and Herbert A. (“Chip”) Frazier is a shareholder of PAR Capital Management. The business address of each of Mr. Reeder, Mr. Downs, Mr. Epker, Mr. Smith, Mr. Tucker and Mr. Frazier is 200 Clarendon Street, 48 ^th Floor, Boston, MA 02116.

(d) and (e) During the last five years, none of the persons identified in this Item 2 has been convicted in any criminal proceeding (excluding traffic violations or similar misdemeanors), or has been a party to any civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, Federal or state securities laws or finding any violations with respect to such laws.

(f) Each natural person identified in this Item 2 is a citizen of the United States. PAR Investment Partners and PAR Group are Delaware limited partnerships and PAR Management is a Delaware corporation.

Item 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

PAR Investment Partners used approximately $73.3 mn (including brokerage commissions) of the working capital of PAR Investment Partners in the aggregate to purchase the Class A Shares reported in this Schedule 13D. Such Class A Shares are or may be held from time to time by PAR Investment Partners in margin accounts established with its brokers or banks and a portion of the purchase price for the Class A Shares may be obtained through margin borrowing. Securities positions which may be held in the margin accounts, including the Class A Shares, may be pledged as collateral security for the repayment of debit balances in the margin accounts.

Item 4. PURPOSE OF TRANSACTION

The Reporting Persons acquired the Class A Shares for investment purposes in the ordinary course of their business of investing in securities for their own accounts or for one or more accounts over which the Reporting Persons have investment or voting power. The Reporting Persons reserve the right to formulate plans and/or make proposals, and take such actions with respect to their investment in the Issuer, including, subject to applicable law, (i) holding the Class A Shares as a passive investor or as an active investor (whether or not as a member of a “group” with other

beneficial owners of Class A Shares or otherwise), (ii) acquiring beneficial ownership of additional Class A Shares (whether directly or through the acquisition of American Depositary Shares representing Class A Shares) in the open market, in privately negotiated transactions or otherwise, (iii) disposing of all or part of their holdings, (iv) entering into financial instruments or other agreements that increase or decrease the Reporting Persons’ economic or beneficial exposure with respect to their investment in the Issuer, engaging in hedging or similar transactions with respect to the Class A Shares, including securities-based swaps or other derivative instruments involving the Class A Shares or other securities of the Issuer (or entering into arrangements in which the counterparty may engage in any of such activities), (v) lending Class A Shares or other portfolio securities to brokers, banks or other financial institutions, which transactions typically obligate the borrower to return the Class A Shares or such other securities to the lender and typically provide that the borrower is entitled to exercise voting rights and to retain dividends during the term of the loan, or borrowing Class A Shares or other securities for the purpose of effecting short sale transactions, and purchasing Class A Shares or other securities for the purpose of closing out such short positions (or entering into arrangements in which the counterparty may engage in any of such activities), (vi) taking other actions which could involve one or more of the types of transactions or have one or more of the results described in Item 4 of this Schedule 13D, or (vii) changing their intention with respect to any or all of the matters referred to in this Item 4.

Item 5. INTEREST IN SECURITIES OF THE ISSUER

(a)-(b) As of April 13, 2017, PAR Investment Partners may be deemed to beneficially own 6,234,000 Class A Shares, representing approximately 20.8% (determined in accordance with Rule 13d-3 under the Act) of the outstanding Class A Shares.

As of April 13, 2017, PAR Group, through its control of PAR Investment Partners as general partner, may be deemed to beneficially own 6,234,000 Class A Shares, representing approximately 20.8% (determined in accordance with Rule 13d-3 under the Act) of the outstanding Class A Shares.

As of April 13, 2017, PAR Capital Management, through its control of PAR Group as general partner, may be deemed to beneficially own 6,234,000 Class A Shares, representing approximately 20.8% (determined in accordance with Rule 13d-3 under the Act) of the outstanding Class A Shares.

The percentage of Class A Shares beneficially owned as set forth above are based on 30,026,635 Class A Shares issued and outstanding as of December 31, 2016, as disclosed in the Issuer’s Annual Report on Form 20-F filed with the Securities and Exchange Commission on March 9, 2017.

(c) Information with respect to all transactions by the Reporting Persons relating to the Class A Shares that were effected during the past sixty days is set forth in Annex A to the original Schedule 13D filed by the Reporting Persons on April 13, 2017, which is incorporated by reference herein.

(d) Not applicable.

(e) Not applicable.

ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO SECURITIES OF THE ISSUER.

Except as otherwise set forth in this Schedule 13D, there are no contracts, arrangements, understandings or relationships among the persons named in Item 2 or between such persons and any other person with respect to any securities of the Issuer.

Item 7. Material to be Filed as Exhibits.

Not applicable.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date: May 16, 2017