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.

This CUSIP number applies to the Issuer’s American depositary shares, each representing one Ordinary Share.

  NAME OF REPORTING PERSON

  SEQUOIA CAPITAL CV IV HOLDCO, LTD. (“SC CV IV HOLDCO”)

  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

  (a)  ☐        (b)  ☐

  SEC USE ONLY

  CITIZENSHIP OR PLACE OF ORGANIZATION

  CAYMAN ISLANDS

NUMBER OF

SHARES

  BENEFICIALLY  

OWNED BY

EACH

REPORTING

PERSON

WITH

  SOLE VOTING POWER

  0

  SHARED VOTING POWER

  1,567,796

  SOLE DISPOSITIVE POWER

  0

  SHARED DISPOSITIVE POWER

  1,567,796

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

  1,567,796

  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

  ☐

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

  2.6%¹

  TYPE OF REPORTING PERSON

  OO

Based on a total of 60,919,842 shares outstanding as of June 30, 2019, as reported in the Issuer’s Report on Form 6-K filed with the Securities and Exchange Commission on September 3, 2019.

  1  

  NAME OF REPORTING PERSON

  SEQUOIA CAPITAL CHINA VENTURE FUND IV, L.P. (“SC CVF IV”)

  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

  (a)  ☐        (b)  ☐

  SEC USE ONLY

  CITIZENSHIP OR PLACE OF ORGANIZATION

  CAYMAN ISLANDS

NUMBER OF

SHARES

  BENEFICIALLY  

OWNED BY

EACH

REPORTING

PERSON

WITH

  SOLE VOTING POWER

  0

  SHARED VOTING POWER

  1,567,796 shares, of which 1,567,796 shares are directly owned by SC CV IV HOLDCO. SC CV IV

  HOLDCO is wholly owned by SC CVF IV.

  SOLE DISPOSITIVE POWER

  0

  SHARED DISPOSITIVE POWER

  1,567,796 shares, of which 1,567,796 shares are directly owned by SC CV IV HOLDCO. SC CV IV

  HOLDCO is wholly owned by SC CVF IV.

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

  1,567,796

  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

  ☐

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

  2.6%¹

  TYPE OF REPORTING PERSON

  PN

Based on a total of 60,919,842 shares outstanding as of June 30, 2019, as reported in the Issuer’s Report on Form 6-K filed with the Securities and Exchange Commission on September 3, 2019.

  1  

  NAME OF REPORTING PERSON

  SC CHINA VENTURE IV MANAGEMENT, L.P. (“SC CV IV MGMT”)

  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

  (a)  ☐        (b)  ☐

  SEC USE ONLY

  CITIZENSHIP OR PLACE OF ORGANIZATION

  CAYMAN ISLANDS

NUMBER OF

SHARES

  BENEFICIALLY  

OWNED BY

EACH

REPORTING

PERSON

WITH

  SOLE VOTING POWER

  0

  SHARED VOTING POWER

  1,567,796 shares, of which 1,567,796 shares are directly owned by SC CV IV HOLDCO. SC CV IV

  HOLDCO is wholly owned by SC CVF IV. SC CV IV MGMT is the General Partner of SC CVF IV.

  SOLE DISPOSITIVE POWER

  0

  SHARED DISPOSITIVE POWER

  1,567,796 shares, of which 1,567,796 shares are directly owned by SC CV IV HOLDCO. SC CV IV

  HOLDCO is wholly owned by SC CVF IV. SC CV IV MGMT is the General Partner of SC CVF IV.

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

  1,567,796

  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

  ☐

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

  2.6%¹

  TYPE OF REPORTING PERSON

  PN

Based on a total of 60,919,842 shares outstanding as of June 30, 2019, as reported in the Issuer’s Report on Form 6-K filed with the Securities and Exchange Commission on September 3, 2019.

  1  

  NAME OF REPORTING PERSON

  SCC GROWTH I HOLDCO A, LTD. (“SCCGI HOLDCO A”)

  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

  (a)  ☐        (b)  ☐

  SEC USE ONLY

  CITIZENSHIP OR PLACE OF ORGANIZATION

  CAYMAN ISLANDS

NUMBER OF

SHARES

  BENEFICIALLY  

OWNED BY

EACH

REPORTING

PERSON

WITH

  SOLE VOTING POWER

  0

  SHARED VOTING POWER

  471,313

  SOLE DISPOSITIVE POWER

  0

  SHARED DISPOSITIVE POWER

  471,313

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

  471,313

  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

  ☐

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

  0.8%¹

  TYPE OF REPORTING PERSON

  OO

Based on a total of 60,919,842 shares outstanding as of June 30, 2019, as reported in the Issuer’s Report on Form 6-K filed with the Securities and Exchange Commission on September 3, 2019.

  1  

  NAME OF REPORTING PERSON

  SEQUOIA CAPITAL CHINA GROWTH FUND I, LP (“SC CGF I”)

  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

  (a)  ☐        (b)  ☐

  SEC USE ONLY

  CITIZENSHIP OR PLACE OF ORGANIZATION

  CAYMAN ISLANDS

NUMBER OF

SHARES

  BENEFICIALLY  

OWNED BY

EACH

REPORTING

PERSON

WITH

  SOLE VOTING POWER

  0

  SHARED VOTING POWER

  471,313 shares, of which 471,313 shares are directly owned by SCCGI HOLDCO A. SCCGI HOLDCO

  A is wholly owned by SC CGF I.

  SOLE DISPOSITIVE POWER

  0

  SHARED DISPOSITIVE POWER

  471,313 shares, of which 471,313 shares are directly owned by SCCGI HOLDCO A. SCCGI HOLDCO

  A is wholly owned by SC CGF I.

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

  471,313

  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

  ☐

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

  0.8%¹

  TYPE OF REPORTING PERSON

  PN

Based on a total of 60,919,842 shares outstanding as of June 30, 2019, as reported in the Issuer’s Report on Form 6-K filed with the Securities and Exchange Commission on September 3, 2019.

  1  

  NAME OF REPORTING PERSON

  SEQUOIA CAPITAL CHINA GROWTH FUND MANAGEMENT I, L.P. (“SCC GF MGMT I”)

  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

  (a)  ☐        (b)  ☐

  SEC USE ONLY

  CITIZENSHIP OR PLACE OF ORGANIZATION

  CAYMAN ISLANDS

NUMBER OF

SHARES

  BENEFICIALLY  

OWNED BY

EACH

REPORTING

PERSON

WITH

  SOLE VOTING POWER

  0

  SHARED VOTING POWER

471,313 shares, of which 471,313 shares are directly held by SCCGI HOLDCO A. SCCGI HOLDCO A is wholly owned by SC CGF I. SCC GF MGMT I is the General Partner of SC CGF I.

  SOLE DISPOSITIVE POWER

  0

  SHARED DISPOSITIVE POWER

471,313 shares, of which 471,313 shares are directly held by SCCGI HOLDCO A. SCCGI HOLDCO A is wholly owned by SC CGF I. SCC GF MGMT I is the General Partner of SC CGF I.

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

  471,313

  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

  ☐

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

  0.8%¹

  TYPE OF REPORTING PERSON

  PN 

Based on a total of 60,919,842 shares outstanding as of June 30, 2019, as reported in the Issuer’s Report on Form 6-K filed with the Securities and Exchange Commission on September 3, 2019.

  NAME OF REPORTING PERSON

  SC CHINA HOLDING LIMITED (“SCC HOLD”)

  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

  (a)  ☐        (b)  ☐

  SEC USE ONLY

  CITIZENSHIP OR PLACE OF ORGANIZATION

  CAYMAN ISLANDS

NUMBER OF

SHARES

  BENEFICIALLY  

OWNED BY

EACH

REPORTING

PERSON

WITH

  SOLE VOTING POWER

  0

  SHARED VOTING POWER

2,039,109 shares, of which 471,313 shares are directly held by SCCGI HOLDCO A and 1,567,796 shares are directly held by SC CV IV HOLDCO. SC CV IV HOLDCO is wholly owned by SC CVF IV. SC CV IV MGMT is the General Partner of SC CVF IV. SCCGI HOLDCO A is wholly owned by SC CGF I. SCC GF MGMT I is the General Partner of SC CGF I. SCC HOLD is the General Partner of SC CV IV MGMT and SCC GF MGMT I.

  SOLE DISPOSITIVE POWER

  0

  SHARED DISPOSITIVE POWER

2,039,109 shares, of which 471,313 shares are directly held by SCCGI HOLDCO A and 1,567,796 shares are directly held by SC CV IV HOLDCO. SC CV IV HOLDCO is wholly owned by SC CVF IV. SC CV IV MGMT is the General Partner of SC CVF IV. SCCGI HOLDCO A is wholly owned by SC CGF I. SCC GF MGMT I is the General Partner of SC CGF I. SCC HOLD is the General Partner of SC CV IV MGMT and SCC GF MGMT I.

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

  2,039,109

  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

  ☐

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

  3.4%¹

  TYPE OF REPORTING PERSON

  OO

Based on a total of 60,919,842 shares outstanding as of June 30, 2019, as reported in the Issuer’s Report on Form 6-K filed with the Securities and Exchange Commission on September 3, 2019.

  1  

  NAME OF REPORTING PERSON

  SNP CHINA ENTERPRISES LIMITED (“SNP”)

  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

  (a)  ☐        (b)  ☐

  SEC USE ONLY

  CITIZENSHIP OR PLACE OF ORGANIZATION

  BRITISH VIRGIN ISLANDS

NUMBER OF

SHARES

  BENEFICIALLY  

OWNED BY

EACH

REPORTING

PERSON

WITH

  SOLE VOTING POWER

  0

  SHARED VOTING POWER

2,039,109 shares, of which 471,313 shares are directly held by SCCGI HOLDCO A and 1,567,796 shares are directly held by SC CV IV HOLDCO. SC CV IV HOLDCO is wholly owned by SC CVF IV. SC CV IV MGMT is the General Partner of SC CVF IV. SCCGI HOLDCO A is wholly owned by SC CGF I. SCC GF MGMT I is the General Partner of SC CGF I. SCC HOLD is the General Partner of SC CV IV MGMT and SCC GF MGMT I. SCC HOLD is wholly owned by SNP.

  SOLE DISPOSITIVE POWER

  0

  SHARED DISPOSITIVE POWER

2,039,109 shares, of which 471,313 shares are directly held by SCCGI HOLDCO A and 1,567,796 shares are directly held by SC CV IV HOLDCO. SC CV IV HOLDCO is wholly owned by SC CVF IV. SC CV IV MGMT is the General Partner of SC CVF IV. SCCGI HOLDCO A is wholly owned by SC CGF I. SCC GF MGMT I is the General Partner of SC CGF I. SCC HOLD is the General Partner of SC CV IV MGMT and SCC GF MGMT I. SCC HOLD is wholly owned by SNP.

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

  2,039,109

  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

  ☐

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

  3.4%¹

  TYPE OF REPORTING PERSON

  OO

Based on a total of 60,919,842 shares outstanding as of June 30, 2019, as reported in the Issuer’s Report on Form 6-K filed with the Securities and Exchange Commission on September 3, 2019.

  NAME OF REPORTING PERSON

  NEIL NANPENG SHEN (“NS”)

  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

  (a)  ☐        (b)  ☐

  SEC USE ONLY

  CITIZENSHIP OR PLACE OF ORGANIZATION

  HONG KONG SAR

NUMBER OF

SHARES

  BENEFICIALLY  

OWNED BY

EACH

REPORTING

PERSON

WITH

  SOLE VOTING POWER

  0

  SHARED VOTING POWER

2,039,109 shares, of which 471,313 shares are directly held by SCCGI HOLDCO A and 1,567,796 shares are directly held by SC CV IV HOLDCO. SC CV IV HOLDCO is wholly owned by SC CVF IV. SC CV IV MGMT is the General Partner of SC CVF IV. SCCGI HOLDCO A is wholly owned by SC CGF I. SCC GF MGMT I is the General Partner of SC CGF I. SCC HOLD is the General Partner of SC CV IV MGMT and SCC GF MGMT I. SCC HOLD is wholly owned by SNP. NS wholly owns SNP.

  SOLE DISPOSITIVE POWER

  0

  SHARED DISPOSITIVE POWER

2,039,109 shares, of which 471,313 shares are directly held by SCCGI HOLDCO A and 1,567,796 shares are directly held by SC CV IV HOLDCO. SC CV IV HOLDCO is wholly owned by SC CVF IV. SC CV IV MGMT is the General Partner of SC CVF IV. SCCGI HOLDCO A is wholly owned by SC CGF I. SCC GF MGMT I is the General Partner of SC CGF I. SCC HOLD is the General Partner of SC CV IV MGMT and SCC GF MGMT I. SCC HOLD is wholly owned by SNP. NS wholly owns SNP.

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

  2,039,109

  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

  ☐

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

  3.4%¹

  TYPE OF REPORTING PERSON

  IN  

Based on a total of 60,919,842 shares outstanding as of June 30, 2019, as reported in the Issuer’s Report on Form 6-K filed with the Securities and Exchange Commission on September 3, 2019.

Name of Issuer:

Address of Issuer’s Principal Executive Offices:

Name of Persons Filing:

Address of Principal Business Office or, if none, Residence:

Citizenship:

CUSIP Number:

OWNERSHIP

OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON

IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.

IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.

NOTICE OF DISSOLUTION OF GROUP.

CERTIFICATION