Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

This CUSIP number applies to the Issuer’s American Depositary Shares, each representing one Ordinary Share, par value $0.00006 per share, of the Issuer.

  NAMES OF REPORTING PERSONS

  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

  Ying Du

  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

  (a)  ☐        (b)  ☐

  SEC USE ONLY

  CITIZENSHIP OR PLACE OF ORGANIZATION

  United States of America

NUMBER OF

SHARES

 BENEFICIALLY 

OWNED BY

EACH

REPORTING

PERSON

WITH

  SOLE VOTING POWER

  3,862,042*

  SHARED VOTING POWER

  0

  SOLE DISPOSITIVE POWER

  2,916,378**

  SHARED DISPOSITIVE POWER

  0

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

  4,742,042***

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

  ☐

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

  4.78% ****

  TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

  IN

As of December 31, 2021. Includes (i) 120,653 Ordinary Shares held directly by the Reporting Person; (ii) 2,795,725 Ordinary Shares issuable to the Reporting Person upon exercise of stock options that are exercisable as of (or within 60 days of) December 31, 2021; and (iii) 945,664 Ordinary Shares held by certain other shareholders, including members of the Issuer’s management and their affiliates, who have granted to the Reporting Person the right to vote their shares and for which the Reporting Person may be deemed to beneficially own such shares for the purpose of this Schedule 13G based on her right to vote such shares, however she has no pecuniary interest therein.

Includes (i) 120,653 Ordinary Shares held directly by the Reporting Person and (ii) 2,795,725 Ordinary Shares issuable to the Reporting Person upon exercise of stock options that are exercisable as of (or within 60 days of) December 31, 2021.

Includes (i) 120,653 Ordinary Shares held directly by the Reporting Person; (ii) 880,000 Ordinary Shares held by 2021 AMZ GRAT (the “GRAT”), a grantor retained annuity trust of which a relative of the Reporting Person is the sole trustee and the Reporting Person is the sole beneficiary during the term of the GRAT; (iii) 2,795,725 Ordinary Shares issuable to the Reporting Person upon exercise of stock options that are exercisable as of (or within 60 days of) December 31, 2021; and (iv) 945,664 Ordinary Shares held by certain other shareholders, including members of the Issuer’s management and their affiliates, who have granted to the Reporting Person the right to vote their shares and for which the Reporting Person may be deemed to beneficially own such shares for the purpose of this Schedule 13G, however she has no pecuniary interest therein.

Based on an aggregate of 99,204,468 Ordinary Shares outstanding, which includes (i) 96,408,743 Ordinary Shares outstanding as of December 31, 2021 and (ii) 2,795,725 Ordinary Shares issuable to the Reporting Person upon exercise of stock options that are exercisable as of (or within 60 days of) December 31, 2021.

/s/ Ying Du