SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ________________ Schedule 13G ________________ INFORMATION TO BE INCLUDED IN STATEMENTS PURSUANT TO RULES 13d-1(b),(c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934* Wayfair Inc. (Name of Issuer) 	 Class A Common Stock (Title of Class of Securities) 94419L101 (CUSIP Number) October 1, 2014 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [ ] Rule 13d-1(b) [X] Rule 13d-1(c) [ ] Rule 13d-1(d) ___________ * The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page. The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). Schedule 13G PAGE 2 of 17 CUSIP No. 94419L101 _____________________________________________________________________________ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Viking Global Investors LP _____________________________________________________________________________ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [x] _____________________________________________________________________________ (3) SEC USE ONLY _____________________________________________________________________________ (4) CITIZENSHIP OR PLACE OF ORGANIZATION Delaware _____________________________________________________________________________ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ______________________________________________________________ BENEFICIALLY (6) SHARED VOTING POWER 1,750,236 OWNED BY ______________________________________________________________ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ______________________________________________________________ PERSON WITH (8) SHARED DISPOSITIVE POWER 1,750,236 _____________________________________________________________________________ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,750,236 _____________________________________________________________________________ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] _____________________________________________________________________________ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 12.6% _____________________________________________________________________________ (12) TYPE OF REPORTING PERSON PN _____________________________________________________________________________ Schedule 13G PAGE 3 of 17 CUSIP No. 94419L101 _____________________________________________________________________________ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Viking Global Performance LLC _____________________________________________________________________________ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [x] _____________________________________________________________________________ (3) SEC USE ONLY _____________________________________________________________________________ (4) CITIZENSHIP OR PLACE OF ORGANIZATION Delaware _____________________________________________________________________________ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ______________________________________________________________ BENEFICIALLY (6) SHARED VOTING POWER 1,252,825 OWNED BY ______________________________________________________________ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ______________________________________________________________ PERSON WITH (8) SHARED DISPOSITIVE POWER 1,252,825 _____________________________________________________________________________ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,252,825 _____________________________________________________________________________ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] _____________________________________________________________________________ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 9.0% _____________________________________________________________________________ (12) TYPE OF REPORTING PERSON OO _____________________________________________________________________________ Schedule 13G	 PAGE 4 of 17 CUSIP No. 94419L101 _____________________________________________________________________________ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Viking Global Equities LP _____________________________________________________________________________ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [x] _____________________________________________________________________________ (3) SEC USE ONLY _____________________________________________________________________________ (4) CITIZENSHIP OR PLACE OF ORGANIZATION Delaware _____________________________________________________________________________ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ______________________________________________________________ BENEFICIALLY (6) SHARED VOTING POWER 427,215 OWNED BY ______________________________________________________________ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ______________________________________________________________ PERSON WITH (8) SHARED DISPOSITIVE POWER 427,215 _____________________________________________________________________________ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 427,215 _____________________________________________________________________________ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] _____________________________________________________________________________ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 3.1% _____________________________________________________________________________ (12) TYPE OF REPORTING PERSON PN _____________________________________________________________________________ Schedule 13G PAGE 5 of 17 CUSIP No. 94419L101 _____________________________________________________________________________ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Viking Global Equities II LP _____________________________________________________________________________ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [x] _____________________________________________________________________________ (3) SEC USE ONLY _____________________________________________________________________________ (4) CITIZENSHIP OR PLACE OF ORGANIZATION Delaware _____________________________________________________________________________ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ______________________________________________________________ BENEFICIALLY (6) SHARED VOTING POWER 25,054 OWNED BY ______________________________________________________________ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ______________________________________________________________ PERSON WITH (8) SHARED DISPOSITIVE POWER 25,054 _____________________________________________________________________________ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 25,054 _____________________________________________________________________________ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] _____________________________________________________________________________ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 0.2% _____________________________________________________________________________ (12) TYPE OF REPORTING PERSON PN _____________________________________________________________________________ Schedule 13G PAGE 6 of 17 CUSIP No. 94419L101 _____________________________________________________________________________ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON VGE III Portfolio Ltd. _____________________________________________________________________________ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [x] _____________________________________________________________________________ (3) SEC USE ONLY _____________________________________________________________________________ (4) CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands _____________________________________________________________________________ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ______________________________________________________________ BENEFICIALLY (6) SHARED VOTING POWER 800,556 OWNED BY ______________________________________________________________ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ______________________________________________________________ PERSON WITH (8) SHARED DISPOSITIVE POWER 800,556 _____________________________________________________________________________ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 800,556 _____________________________________________________________________________ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] _____________________________________________________________________________ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.8% _____________________________________________________________________________ (12) TYPE OF REPORTING PERSON CO _____________________________________________________________________________ Schedule 13G PAGE 7 of 17 CUSIP No. 94419L101 _____________________________________________________________________________ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Viking Long Fund GP LLC _____________________________________________________________________________ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [x] _____________________________________________________________________________ (3) SEC USE ONLY _____________________________________________________________________________ (4) CITIZENSHIP OR PLACE OF ORGANIZATION Delaware _____________________________________________________________________________ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ______________________________________________________________ BENEFICIALLY (6) SHARED VOTING POWER 497,411 OWNED BY ______________________________________________________________ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ______________________________________________________________ PERSON WITH (8) SHARED DISPOSITIVE POWER 497,411 _____________________________________________________________________________ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 497,411 _____________________________________________________________________________ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] _____________________________________________________________________________ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 3.6% _____________________________________________________________________________ (12) TYPE OF REPORTING PERSON OO _____________________________________________________________________________ Schedule 13G PAGE 8 of 17 CUSIP No. 94419L101 _____________________________________________________________________________ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Viking Long Fund Master Ltd. _____________________________________________________________________________ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [x] _____________________________________________________________________________ (3) SEC USE ONLY _____________________________________________________________________________ (4) CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands _____________________________________________________________________________ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ______________________________________________________________ BENEFICIALLY (6) SHARED VOTING POWER 497,411 OWNED BY ______________________________________________________________ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ______________________________________________________________ PERSON WITH (8) SHARED DISPOSITIVE POWER 497,411 _____________________________________________________________________________ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 497,411 _____________________________________________________________________________ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] _____________________________________________________________________________ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 3.6% _____________________________________________________________________________ (12) TYPE OF REPORTING PERSON CO _____________________________________________________________________________ Schedule 13G PAGE 9 of 17 CUSIP No. 94419L101 _____________________________________________________________________________ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON O. Andreas Halvorsen _____________________________________________________________________________ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [x] _____________________________________________________________________________ (3) SEC USE ONLY _____________________________________________________________________________ (4) CITIZENSHIP OR PLACE OF ORGANIZATION Norway _____________________________________________________________________________ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ______________________________________________________________ BENEFICIALLY (6) SHARED VOTING POWER 1,750,236 OWNED BY ______________________________________________________________ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ______________________________________________________________ PERSON WITH (8) SHARED DISPOSITIVE POWER 1,750,236 _____________________________________________________________________________ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,750,236 _____________________________________________________________________________ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] _____________________________________________________________________________ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 12.6% _____________________________________________________________________________ (12) TYPE OF REPORTING PERSON IN _____________________________________________________________________________ Schedule 13G PAGE 10 of 17 CUSIP No. 94419L101 _____________________________________________________________________________ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON David C. Ott _____________________________________________________________________________ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [x] _____________________________________________________________________________ (3) SEC USE ONLY _____________________________________________________________________________ (4) CITIZENSHIP OR PLACE OF ORGANIZATION United States _____________________________________________________________________________ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ______________________________________________________________ BENEFICIALLY (6) SHARED VOTING POWER 1,750,236 OWNED BY ______________________________________________________________ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ______________________________________________________________ PERSON WITH (8) SHARED DISPOSITIVE POWER 1,750,236 _____________________________________________________________________________ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,750,236 _____________________________________________________________________________ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] _____________________________________________________________________________ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 12.6% _____________________________________________________________________________ (12) TYPE OF REPORTING PERSON IN _____________________________________________________________________________ Schedule 13G PAGE 11 of 17 CUSIP No. 94419L101 _____________________________________________________________________________ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Thomas W. Purcell, Jr. _____________________________________________________________________________ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [x] _____________________________________________________________________________ (3) SEC USE ONLY _____________________________________________________________________________ (4) CITIZENSHIP OR PLACE OF ORGANIZATION United States _____________________________________________________________________________ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ______________________________________________________________ BENEFICIALLY (6) SHARED VOTING POWER 1,750,236 OWNED BY ______________________________________________________________ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ______________________________________________________________ PERSON WITH (8) SHARED DISPOSITIVE POWER 1,750,236 _____________________________________________________________________________ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,750,236 _____________________________________________________________________________ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] _____________________________________________________________________________ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 12.6% _____________________________________________________________________________ (12) TYPE OF REPORTING PERSON IN _____________________________________________________________________________ Schedule 13G PAGE 12 of 17 CUSIP No. 94419L101 _____________________________________________________________________________ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Daniel S. Sundheim _____________________________________________________________________________ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [x] _____________________________________________________________________________ (3) SEC USE ONLY _____________________________________________________________________________ (4) CITIZENSHIP OR PLACE OF ORGANIZATION United States _____________________________________________________________________________ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ______________________________________________________________ BENEFICIALLY (6) SHARED VOTING POWER 1,750,236 OWNED BY ______________________________________________________________ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ______________________________________________________________ PERSON WITH (8) SHARED DISPOSITIVE POWER 1,750,236 _____________________________________________________________________________ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,750,236 _____________________________________________________________________________ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] _____________________________________________________________________________ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 12.6% _____________________________________________________________________________ (12) TYPE OF REPORTING PERSON IN _____________________________________________________________________________ Schedule 13G PAGE 13 of 17 CUSIP No. 94419L101 ITEM 1(a). NAME OF ISSUER: Wayfair Inc. ITEM 1(b). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES: 4 Copley Place, 7th Floor Boston, Massachusetts 02116 ITEM 2(a). NAME OF PERSON FILING: 	 Viking Global Performance LLC ("VGP"), 	 Viking Global Investors LP ("VGI"), 	 Viking Global Equities LP ("VGE"), 	 Viking Global Equities II LP ("VGEII"), 	 VGE III Portfolio Ltd. ("VGEIII"), Viking Long Fund GP LLC ("VLFGP"), 	 Viking Long Fund Master Ltd. ("VLFM"), 	 O. Andreas Halvorsen, David C. Ott, Thomas W. Purcell, Jr. and 	 Daniel S. Sundheim (collectively, the "Reporting Persons") ITEM 2(b). ADDRESS OF PRINCIPAL OFFICE OR, IF NONE, RESIDENCE: The business address of each of the Reporting Persons is 55 Railroad Avenue, Greenwich, Connecticut 06830. ITEM 2(c). CITIZENSHIP: VGE, VGEII and VGI are Delaware limited partnerships, VGEIII and VLFM are Cayman Islands exempted companies, and VGP and VLFGP are both Delaware limited liability companies. O. Andreas Halvorsen is a citizen of Norway. David C. Ott, Thomas W. Purcell, Jr. and Daniel S. Sundheim 	 are citizens of the United States. ITEM 2(d). TITLE OF CLASS OF SECURITIES: Class A Common Stock ("Common Stock") ITEM 2(e). CUSIP NUMBER: 94419L101 ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO 13d-1(b) OR 13d-2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A: (a) [ ] Broker or dealer registered under Section 15 of the Act (b) [ ] Bank as defined in Section 3(a)(6) of the Act (c) [ ] Insurance Company as defined in Section 3(a)(19) of the Act (d) [ ] Investment Company registered under Section 8 of the Investment Company Act of 1940 (e) [ ] Investment Adviser registered under Section 203 of the Investment Advisers Act of 1940: see Rule 13d- 1(b)(1)(ii)(E) (f) [ ] Employee Benefit Plan, Pension Fund which is subject to the provisions of the Employee Retirement Income Security Act of 1974 or Endowment Fund; see Rule 13d- 1(b)(1)(ii)(F) Schedule 13G PAGE 14 of 17 CUSIP No. 94419L101 (g) [ ] Parent Holding Company, in accordance with Rule 13d- 1(b)(ii)(G) (h) [ ] Savings Associations as defined in Section 3(b) of the Federal Deposit Insurance Act (i) [ ] Church Plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act of 1940 (j) [ ] A non-U.S. institution in accordance with 		 Rule 240.13d-1(b)(1)(ii)(J) 	 (k) [ ] Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K). If filing as a non-U.S. institution in accordance with Rule 240.13d-1(b)(1)(ii)(J), please specify 		 the type of institution: ITEM 4. OWNERSHIP. A. VGI (a) Amount beneficially owned: 1,750,236 (b) Percent of class: 12.6% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote 0 (ii) shared power to vote or to direct the vote 1,750,236 (iii) sole power to dispose or to direct the disposition of 0 (iv) shared power to dispose or to direct the disposition of 1,750,236 VGI provides managerial services to VGE, VGEII,VGEIII 	 and VLFM. VGI has the authority to dispose of and vote 		 the shares of Common Stock. 	 Based on Rule 13d-3 of the Securities Exchange Act of 1934, 	 as amended (the "Act"), VGI may be deemed to beneficially 	 own the shares of Common Stock directly held by VGE, VGEII, 	 VGEIII and VLFM. VGI does not directly own any shares of Common 		 Stock. Schedule 13G PAGE 15 of 17 CUSIP No. 94419L101 B. VGP (a) Amount beneficially owned: 1,252,825 (b) Percent of class: 9.0% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote 0 (ii) shared power to vote or to direct the vote 1,252,825 (iii) sole power to dispose or to direct the disposition of 0 (iv) shared power to dispose or to direct the disposition of 1,252,825 		 VGP, as the general partner of VGE and VGEII, has the 		 authority to dispose of and vote the shares of Common Stock 	 directly owned by VGE and VGEII. VGP serves as investment 		 manager to VGEIII and has the authority to dispose of and vote 		 the shares of Common Stock directly owned by VGEIII. VGP does 		 not directly own any shares of Common Stock. 	 Based on Rule 13d-3 of the Act, VGP may be deemed to 	 beneficially own the shares of Common Stock directly held by 		 VGE, VGEII and VGEIII. C. VLFGP (a) Amount beneficially owned: 497,411 (b) Percent of class: 3.6% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote 0 (ii) shared power to vote or to direct the vote 497,411 (iii) sole power to dispose or to direct the disposition of 0 (iv) shared power to dispose or to direct the disposition of 497,411 VLFGP serves as the investment manager of VLFM and has the 		 authority to dispose of and vote the shares of Common Stock 	 directly owned by VLFM. VLFGP does not directly own 		 any shares of Common Stock. Based on Rule 13d-3 of the Act, VLFGP may be deemed to 	 beneficially own the shares of Common Stock directly held by 		 VLFM. D. VGE (a) Amount beneficially owned: 427,215 (b) Percent of class: 3.1% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote 0 (ii) shared power to vote or to direct the vote 427,215 (iii) sole power to dispose or to direct the disposition of 0 (iv) shared power to dispose or to direct the disposition of 427,215 VGE has the authority to dispose of and vote the shares 		 of Common Stock directly owned by it, which power may be 		 exercised by its general partner, VGP, and by VGI, an 		 affiliate of VGP, which provides managerial services to VGE. E. VGEII (a) Amount beneficially owned: 25,054 (b) Percent of class: 0.2% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote 0 (ii) shared power to vote or to direct the vote 25,054 (iii) sole power to dispose or to direct the disposition of 0 (iv) shared power to dispose or to direct the disposition of 25,054 VGEII has the authority to dispose of and vote the shares 		 of Common Stock directly owned by it, which power may be 		 exercised by its general partner, VGP, and by VGI, an 		 affiliate of VGP, which provides managerial services to VGEII. F. VGEIII (a) Amount beneficially owned: 800,556 (b) Percent of class: 5.8% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote 0 (ii) shared power to vote or to direct the vote 800,556 (iii) sole power to dispose or to direct the disposition of 0 (iv) shared power to dispose or to direct the disposition of 800,556 VGEIII has the authority to dispose of and vote the shares 		 of Common Stock directly owned by it, which power may be 		 exercised by its investment manager, VGP, and by VGI, an 		 affiliate of VGP, which provides managerial services to VGEIII. 		 Viking Global Equities III Ltd. (a Cayman Islands exempted 		 company) invests substantially all of its assets through VGEIII. G. VLFM (a) Amount beneficially owned: 497,411 (b) Percent of class: 3.6% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote 0 (ii) shared power to vote or to direct the vote 497,411 (iii) sole power to dispose or to direct the disposition of 0 (iv) shared power to dispose or to direct the disposition of 497,411 VLFM has the authority to dispose of and vote the 		 shares of Common Stock directly owned by it, which power may 		 be exercised by its investment manager, VLFGP, and by VGI, 		 an affiliate of VLFGP, which provides managerial services to VLFM. Viking Long Fund LP (a Delaware limited partnership) 		 and Viking Long Fund III Ltd. (a Cayman Islands exempted 		 company), through its investment in Viking Long Fund Intermediate 		 LP (a Cayman Islands limited partnership), invest substantially 		 all of their assets through VLFM. Schedule 13G PAGE 16 of 17 CUSIP No. 94419L101 H. O. Andreas Halvorsen, David C. Ott, Thomas W. Purcell, Jr. and 	 Daniel S. Sundheim (a) Amount beneficially owned: 1,750,236 (b) Percent of class: 12.6% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote 0 (ii) shared power to vote or to direct the vote 1,750,236 (iii) sole power to dispose or to direct the disposition of 0 (iv) shared power to dispose or to direct the disposition of 1,750,236 	 Messrs. Halvorsen, Ott, Purcell and Sundheim, as 	 Executive Committee Members of VGI, VGP and VLFGP, have shared 	 authority to dispose of and vote the shares of Common Stock 	 beneficially owned by VGI, VGP and VLFGP. None of Messrs. 	 Halvorsen, Ott, Purcell and Sundheim directly owns any shares of 		 Common Stock. 	 Based on Rule 13d-3 of the Act, each may be deemed to beneficially 	 own the shares of Common Stock directly held by VGE, VGE II, 		 VGEIII and VLFM. 	The percentages used herein and in this Item 4 are calculated 	based upon the Issuer having 13,920,986 shares of Class A 	Common Stock outstanding, which figure reflects (i) the 11,000,000 	shares of Class A Common Stock outstanding as reported on the Prospectus 	filed by the Issuer on Form 424B4 on October 2, 2014, (ii) the 1,650,000 	shares of Class A Common Stock reported as issued pursuant to the 	underwriters option to purchase additional shares, as published on 	October 7, 2014 in a press release on the website of the Issuer and 	(iii) the 1,270,986 shares of Class B Common Stock beneficially 	owned in the aggregate by the Reporting Persons. 	Pursuant to Rule 13d-3(d)(1), all shares of Class B Common Stock held 	by the Reporting Persons were deemed to be converted for the purposes of 	(i) determining the aggregate amount of shares of Class A Common Stock 	beneficially owned by the Reporting Persons and (ii) calculating the 	percentages of the Class A Common Stock owned by such Reporting Persons. 	Consequently, all Class A Common Stock amounts disclosed herein are 	inclusive of Class B Common Stock amounts held by the Reporting Persons. 	Each share of Class A Common Stock is entitled to one vote, and 	each share of Class B Common Stock is entitled to ten votes. 	There were 71,757,659 shares of Class B Common Stock outstanding 	as reported on the Prospectus filed by the Issuer on Form 424B4 	on October 2, 2014, including the 1,270,986 shares of Class B 	Common Stock beneficially owned by the Reporting Persons. The ownership 	percentages reported herein do not reflect the ten for one voting 	power of the Class B Common Stock, because these shares are treated 	as converted into Class A Common Stock for the purpose of this report. ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS. If this statement is being filed to report the fact that as of the date hereof the Reporting Persons has ceased to be the beneficial owner of more than five percent of the class of securities, check the following.[] ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON. Yes, see Item 4. ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY. 	 Not applicable. ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP. 	 Not applicable. ITEM 9. NOTICE OF DISSOLUTION OF GROUP. 	 Not applicable. ITEM 10. CERTIFICATION. (if filing pursuant to Rule 13d-1(c)) By signing below each Reporting Person certifies that, to the best of its knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and not held in connection with or as a participant in any transaction having that purpose or effect. Schedule 13G PAGE 17 of 17 CUSIP No. 94419L101 SIGNATURES After reasonable inquiry and to the best of our knowledge and belief, the undersigned certify that the information set forth in this statement is true, complete and correct. DATED: October 14, 2014 			/s/ O. ANDREAS HALVORSEN By: O. Andreas Halvorsen - individually and as an Executive Committee Member of VIKING GLOBAL PERFORMANCE LLC, on behalf of itself and VIKING GLOBAL EQUITIES LP, VIKING GLOBAL EQUITIES II LP,VGE III PORTFOLIO LTD. and as an Executive Committee Member of Viking Global Partners LLC, on behalf of VIKING GLOBAL INVESTORS LP, and as 			an Executive Committee Member of 			VIKING LONG FUND GP LLC on behalf of itself and VIKING LONG FUND MASTER LTD. /s/ DAVID C. OTT By: David C. Ott - individually and as an Executive Committee Member of VIKING GLOBAL PERFORMANCE LLC, on behalf of itself and VIKING GLOBAL EQUITIES LP, VIKING GLOBAL EQUITIES II LP,VGE III PORTFOLIO LTD. and as an Executive Committee Member of Viking Global Partners LLC, on behalf of VIKING GLOBAL INVESTORS LP, and as 			an Executive Committee Member of 			VIKING LONG FUND GP LLC on behalf of itself and VIKING LONG FUND MASTER LTD. /s/ THOMAS W. PURCELL, JR. By: Thomas W. Purcell, Jr. - individually and as an Executive Committee Member of VIKING GLOBAL PERFORMANCE LLC, on behalf of itself and VIKING GLOBAL EQUITIES LP, VIKING GLOBAL EQUITIES II LP,VGE III PORTFOLIO LTD. and as an Executive Committee Member of Viking Global Partners LLC, on behalf of VIKING GLOBAL INVESTORS LP, and as 			an Executive Committee Member of 			VIKING LONG FUND GP LLC on behalf of itself and VIKING LONG FUND MASTER LTD. /s/ DANIEL S. SUNDHEIM By: Daniel S. Sundheim - individually and as an Executive Committee Member of VIKING GLOBAL PERFORMANCE LLC, on behalf of itself and VIKING GLOBAL EQUITIES LP, VIKING GLOBAL EQUITIES II LP,VGE III PORTFOLIO LTD. and as an Executive Committee Member of Viking Global Partners LLC, on behalf of VIKING GLOBAL INVESTORS LP, and as 			an Executive Committee Member of 			VIKING LONG FUND GP LLC on behalf of itself and VIKING LONG FUND MASTER LTD.