240.13d-102 Schedule 13G - 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.

Securities and Exchange Commission, Washington, D.C. 20549

Schedule 13G

Under the Securities Exchange Act of 1934

(Amendment No._)*

(Name of Issuer)

CytomX Therapeutics, Inc.

(Title of Class of Securities)

Common Stock, $0.00001 Par Value Per Share

(CUSIP Number)

23284F105

(Date of Event Which Requires Filing of this Statement)

January 25, 2021

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).
1


CUSIP No. 23284F105
(1) Names of reporting persons    Point72 Asset Management, L.P.
 
(2) Check the appropriate box if a member of a group
(a)
(see instructions)
(b)X
(3) SEC use only
 
(4) Citizenship or place of organization Delaware
 
Number of shares beneficially owned by each reporting person with:
 
(5) Sole voting power                  0
 
(6) Shared voting power              5,500,300 (see Item 4)
 
(7) Sole dispositive power           0
 
(8) Shared dispositive power       5,500,300 (see Item 4)
 
(9) Aggregate amount beneficially owned by each reporting person
5,500,300 (see Item 4)
 
(10) Check if the aggregate amount in Row (9) excludes certain shares
(see instructions)
 
(11) Percent of class represented by amount in Row (9) 9.1% (see Item 4)
 
(12) Type of reporting person (see instructions)  PN
 

2

CUSIP No. 23284F105
(1) Names of reporting persons    Point72 Capital Advisors, Inc.
 
(2) Check the appropriate box if a member of a group
(a)
(see instructions)
(b)X
(3) SEC use only
 
(4) Citizenship or place of organization Delaware
 
Number of shares beneficially owned by each reporting person with:
 
(5) Sole voting power                  0
 
(6) Shared voting power              5,500,300 (see Item 4)
 
(7) Sole dispositive power           0
 
(8) Shared dispositive power       5,500,300 (see Item 4)
 
(9) Aggregate amount beneficially owned by each reporting person
5,500,300 (see Item 4)
 
(10) Check if the aggregate amount in Row (9) excludes certain shares
(see instructions)
 
(11) Percent of class represented by amount in Row (9) 9.1% (see Item 4)
 
(12) Type of reporting person (see instructions) CO
 

3

CUSIP No. 23284F105
(1) Names of reporting persons    Cubist Systematic Strategies, LLC
 
(2) Check the appropriate box if a member of a group
(a)
(see instructions)
(b)X
(3) SEC use only
 
(4) Citizenship or place of organization Delaware
 
Number of shares beneficially owned by each reporting person with:
 
(5) Sole voting power                  0
 
(6) Shared voting power              23,606 (see Item 4)
 
(7) Sole dispositive power           0
 
(8) Shared dispositive power       23,606 (see Item 4)
 
(9) Aggregate amount beneficially owned by each reporting person
23,606 (see Item 4)
 
(10) Check if the aggregate amount in Row (9) excludes certain shares
(see instructions)
 
(11) Percent of class represented by amount in Row (9) <0.1% (see Item 4)
 
(12) Type of reporting person (see instructions) OO
 

4

CUSIP No. 23284F105
(1) Names of reporting persons    Steven A. Cohen
 
(2) Check the appropriate box if a member of a group
(a)
(see instructions)
(b)X
(3) SEC use only
 
(4) Citizenship or place of organization United States
 
Number of shares beneficially owned by each reporting person with:
 
(5) Sole voting power                  0
 
(6) Shared voting power              5,523,906 (see Item 4)
 
(7) Sole dispositive power           0
 
(8) Shared dispositive power       5,523,906 (see Item 4)
 
(9) Aggregate amount beneficially owned by each reporting person
5,523,906 (see Item 4)
 
(10) Check if the aggregate amount in Row (9) excludes certain shares
(see instructions)
 
(11) Percent of class represented by amount in Row (9) 9.1% (see Item 4)
 
(12) Type of reporting person (see instructions)  IN
 

5

Item 1(a) Name of issuer:

CytomX Therapeutics, Inc.

Item 1(b) Address of issuer's principal executive offices:

151 Oyster Point Blvd., Suite 400, South San Francisco, CA 94080

2(a) Name of person filing:

This statement is filed by: (i) Point72 Asset Management, L.P. (“Point72 Asset
Management”) with respect to shares of common stock, par value $0.00001 per
share (“Shares”), of the Issuer held by certain investment funds it manages;
(ii) Point72 Capital Advisors, Inc. (“Point72 Capital Advisors Inc.”) with
respect to Shares held by certain investment funds managed by Point72 Asset
Management; (iii) Cubist Systematic Strategies, LLC (“Cubist Systematic
Strategies”) with respect to Shares held by certain investment funds it
manages; and (iv) Steven A. Cohen (“Mr. Cohen”) with respect to Shares
beneficially owned by Point72 Asset Management, Point72 Capital Advisors Inc.,
and Cubist Systematic Strategies.

Point72 Asset Management, Point72 Capital Advisors Inc., Cubist Systematic
Strategies, and Mr. Cohen have entered into a Joint Filing Agreement, a copy of
which is filed with this Schedule 13G as Exhibit 99.1, pursuant to which they
have agreed to file this Schedule 13G jointly in accordance with the
provisions of Rule 13d-1(k) of the Act.

2(b) Address or principal business office or, if none, residence:

The address of the principal business office of (i) Point72 Asset Management,
Point72 Capital Advisors Inc., and Mr. Cohen is 72 Cummings
Point Road, Stamford, CT 06902; and (ii) Cubist Systematic Strategies
is 55 Hudson Yards, New York, NY 10001.

2(c) Citizenship:

Point72 Asset Management is a Delaware limited partnership.
Point72 Capital Advisors Inc. is a Delaware corporation. Cubist
Systematic Strategies is a Delaware limited liability company.
Mr. Cohen is a United States citizen.
6

2(d) Title of class of securities:

Common Stock, $0.00001 Par Value Per Share

2(e) CUSIP Number:

23284F105

Item 3.

Not applicable

Item 4. Ownership

As of the close of business on January 25, 2021:

1. Point72 Asset Management, L.P.
(a) Amount beneficially owned: 5,500,300
(b) Percent of class: 9.1% 
(c) Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote: 0
(ii) Shared power to vote or to direct the vote: 5,500,300 
(iii) Sole power to dispose or to direct the disposition of: 0
(iv) Shared power to dispose or to direct the disposition of: 5,500,300

2. Point72 Capital Advisors, Inc.
(a) Amount beneficially owned: 5,500,300
(b) Percent of class: 9.1% 
(c) Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote: 0
(ii) Shared power to vote or to direct the vote: 5,500,300 
(iii) Sole power to dispose or to direct the disposition of: 0
(iv) Shared power to dispose or to direct the disposition of: 5,500,300
7

3. Cubist Systematic Strategies, LLC
(a) Amount beneficially owned: 23,606
(b) Percent of class: <0.1% 
(c) Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote: 0
(ii) Shared power to vote or to direct the vote: 23,606
(iii) Sole power to dispose or to direct the disposition of: 0
(iv) Shared power to dispose or to direct the disposition of: 23,606

4. Steven A. Cohen
(a) Amount beneficially owned: 5,523,906
(b) Percent of class: 9.1% 
(c) Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote: 0
(ii) Shared power to vote or to direct the vote: 5,523,906 
(iii) Sole power to dispose or to direct the disposition of: 0
(iv) Shared power to dispose or to direct the disposition of: 5,523,906

Point72 Asset Management, Point72 Capital Advisors Inc., Cubist Systematic
Strategies, and Mr. Cohen own directly no Shares. Pursuant to an investment
management agreement, Point72 Asset Management maintains investment and voting
power with respect to the securities held by certain investment funds it manages.
Point72 Capital Advisors Inc. is the general partner of Point72 Asset Management.
Pursuant to an investment management agreement, Cubist Systematic Strategies
 maintains investment and voting power with respect to the securities held by
certain investment funds it manages. Mr. Cohen controls each of Point72
Asset Management, Point72 Capital Advisors Inc., and Cubist Systematic
Strategies. By reason of the provisions of Rule 13d-3 of the Securities
Exchange Act of 1934, as amended, each of (i) Point72 Asset Management,
Point72 Capital Advisors Inc., and Mr. Cohen may be deemed to beneficially
own 5,500,300 Shares (constituting approximately 9.1% of the Shares
outstanding) and (ii) Cubist Systematic Strategies and Mr. Cohen may be
deemed to beneficially own 23,606 Shares (constituting <0.1% of the Shares
outstanding). Each of Point72 Asset Management, Point72 Capital Advisors Inc.,
Cubist Systematic Strategies, and Mr. Cohen disclaims beneficial ownership
of any of the securities covered by this statement.
8

Item 5. Ownership of 5 Percent or Less of a Class.

If this statement is being filed to report the fact that as of the date hereof
the reporting person has ceased to be the beneficial owner of more than
5 percent of the class of securities, check the following [  ].

Item 6.  Ownership of More than 5 Percent on Behalf of Another Person.

Not applicable

Item 7.  Identification and Classification of the Subsidiary Which Acquired
the Security Being Reporting on by the Parent Holding Company or Control
Person.

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. Certifications

By signing below I certify that, to the best of my 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 are not held in connection with or
as a participant in any transaction having that purpose or effect, other than activities
solely in connection with a nomination under§ 240.14a-11.
9


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.


Dated: January 26, 2021


POINT72 ASSET MANAGEMENT, L.P.

By: /s/ Jason M. Colombo
Name: Jason M. Colombo
Title: Authorized Person


POINT72 CAPITAL ADVISORS, INC.

By: /s/ Jason M. Colombo
Name: Jason M. Colombo
Title: Authorized Person


CUBIST SYSTEMATIC STRATEGIES, LLC

By: /s/ Jason M. Colombo
Name: Jason M. Colombo
Title: Authorized Person


STEVEN A. COHEN

By: /s/ Jason M. Colombo
Name: Jason M. Colombo
Title: Authorized Person

Exhibit 99.1
JOINT FILING AGREEMENT

The undersigned hereby agree that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, and that all subsequent amendments to this statement on Schedule 13G may be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements.  
Dated: January 26, 2021


POINT72 ASSET MANAGEMENT, L.P.

By: /s/ Jason M. Colombo
Name: Jason M. Colombo
Title: Authorized Person


POINT72 CAPITAL ADVISORS, INC.

By: /s/ Jason M. Colombo
Name: Jason M. Colombo
Title: Authorized Person


CUBIST SYSTEMATIC STRATEGIES, LLC

By: /s/ Jason M. Colombo
Name: Jason M. Colombo
Title: Authorized Person


STEVEN A. COHEN

By: /s/ Jason M. Colombo
Name: Jason M. Colombo
Title: Authorized Person