United States
Securities and Exchange Commission
Washington, D.C. 20549
Schedule 13G
(Rule 13d-102)

Information to be Included in Statements Filed Pursuant
to § 240.13d-1(b), (c) and (d) and Amendments Thereto Filed
Pursuant to § 240.13d-2


(Amendment No. )*

Zentalis Pharmaceuticals, Inc.
(Name of Issuer)

Common Stock, par value $0.001
(Title of Class of Securities)
(CUSIP Number)
December 31, 2020
(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)
[     ]    Rule 13d-1(c)
[ X ]    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).


CUSIP No. 98943L107Schedule 13G
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Names of Reporting Persons

Anthony Y. Sun

2Check the Appropriate Box if a Member of a Group      (a) [ ]
     (b) [ ]
3SEC Use Only
Citizenship or Place of Organization

United States

Number of Shares Beneficially Owned by Each Reporting Person With5
Sole Voting Power


Shared Voting Power


Sole Dispositive Power


Shared Dispositive Power


Aggregate Amount Beneficially Owned by Each Reporting Person


Check if the Aggregate Amount in Row (9) Excludes Certain Shares

    Not Applicable

Percent of Class Represented by Amount in Row 9


Type of Reporting Person


CUSIP No. 98943L107Schedule 13G
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ITEM 1. (a)     Name of Issuer:
Zentalis Pharmaceuticals, Inc. (the “Issuer”).
i.Address of Issuer’s Principal Executive Offices:

530 Seventh Avenue, Suite 2201, New York, NY 10018.
ITEM 2. (a)    Name of Person Filing:
This statement is filed on behalf of Anthony Y. Sun (the “Reporting Person”).
i.Address of Principal Business Office:
The business address of the Reporting Person is c/o Zentalis Pharmaceuticals, Inc., 530 Seventh Avenue, Suite 2201, New York, NY 10018.
The Reporting Person is a citizen of the United States.
iii.Title of Class of Securities:

Common stock, par value $0.001 per share (“Common Stock”).
iv.CUSIP Number:

Not applicable.
ITEM 4.Ownership.

    The ownership information below represents beneficial ownership of shares of Common Stock as of December 31, 2020, based upon 41,040,286 shares of Common Stock outstanding as of December 31, 2020.
(a) Amount beneficially owned:
The Reporting Person is the record holder of 1,804,005 shares of Common Stock. The Reporting Person may also be deemed to share beneficial ownership of (i) 213,600 shares of Common Stock directly held directly by Hao Bao Zi Trust LLC on behalf of the Hao Bao Zi Trust (the “Trust”), for which the Reporting


CUSIP No. 98943L107Schedule 13G
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Person’s spouse is the investment advisor with sole power to make investment decisions regarding the shares of Common Stock held by the Trust; and (ii) 974,302 shares of Common Stock held directly by Essex Group International, LLC (“Essex”), for which the Reporting Person is a managing member. The Reporting Person disclaims beneficial ownership of the Common Stock held directly by the Trust and Essex.
(b) Percent of class: 7.3%
(c) Number of shares as to which the person has:
a.Sole power to vote or to direct the vote: 1,804,005
b.Shared power to vote or direct the vote: 1,187,902
c.Sole power to dispose or to direct the disposition of: 1,804,005
d.Shared power to dispose or to direct the disposition of: 1,187,902
ITEM 5.Ownership of Five Percent or Less of a Class.
    Not applicable.
ITEM 6.Ownership of More than Five Percent on Behalf of Another Person.
Not applicable.
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.
Not applicable.


CUSIP No. 98943L107Schedule 13G
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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:    February 3, 2021

Anthony Y. Sun

/s/ Anthony Y. Sun