FMR discloses 14.6% CytomX (CTMX) ownership stake in 13G/A

Rhea-AI Filing Summary

FMR LLC and Abigail P. Johnson report beneficial ownership of 24,688,109 shares of CytomX Therapeutics, Inc. common stock, representing 14.6% of the class as of 12/31/2025, in this Amendment No. 3 to their Schedule 13G.

The shares are reported as held in the ordinary course of business and not for the purpose of changing or influencing control of CytomX. One or more other persons may receive dividends or sale proceeds from these shares, but no such person holds more than five percent of the outstanding common stock.

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Accepted by SEC EDGAR 02/05/2026 - 01:20 PM Learn about SEC filing dates

FAQ

What does the latest Schedule 13G/A reveal about FMR LLC’s ownership of CTMX?

FMR LLC reports beneficial ownership of 24,688,109 CytomX Therapeutics common shares, representing 14.6% of the outstanding class. This reflects holdings as of December 31, 2025, disclosed in Amendment No. 3 to their Schedule 13G filing.

How many CytomX (CTMX) shares does FMR LLC beneficially own and what percentage is this?

FMR LLC reports beneficial ownership of 24,688,109 shares of CytomX Therapeutics common stock, equal to 14.6% of the class. This level of ownership makes FMR a significant institutional holder under U.S. securities disclosure rules.

Who are the reporting persons in this CytomX (CTMX) Schedule 13G/A filing?

The reporting persons are FMR LLC and Abigail P. Johnson. FMR LLC is the institutional filer, while Johnson reports beneficial ownership through dispositive power over the same 24,688,109 CytomX common shares identified in the Schedule 13G amendment.

As of what date is FMR LLC’s 14.6% CytomX (CTMX) ownership reported in this filing?

The 14.6% beneficial ownership stake, covering 24,688,109 CytomX common shares, is reported as of December 31, 2025. That date is the event triggering this Schedule 13G/A amendment and anchors the ownership information disclosed.

Is FMR LLC’s CytomX (CTMX) position intended to influence control of the company?

The filing certifies the CytomX shares were acquired and are held in the ordinary course of business. It states they were not acquired and are not held to change or influence control of CytomX or in connection with any control-related transaction.

Do other investors share in dividends or sale proceeds from FMR LLC’s CTMX shares?

One or more other persons have rights to receive dividends or sale proceeds from the CytomX common shares reported. However, the filing states that no single such person has an interest in more than five percent of the total outstanding CytomX common stock.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 3)

CYTOMX THERAPEUTICS INC

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

23284F105

(CUSIP Number)

12/31/2025

(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)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. 23284F105

1

Names of Reporting Persons

FMR LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

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 24,688,109.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 24,688,109.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

24,688,109.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

14.6 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP No. 23284F105

1

Names of Reporting Persons

Abigail P. Johnson

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

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 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 24,688,109.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

24,688,109.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

14.6 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: CYTOMX THERAPEUTICS INC
(b)	Address of issuer's principal executive offices: 151 OYSTER POINT BLVD.,SUITE 400,South San Francisco,CA,USA,94080
Item 2.
(a)	Name of person filing: FMR LLC
(b)	Address or principal business office or, if none, residence: 245 Summer Street, Boston, Massachusetts 02210
(c)	Citizenship: Not applicable
(d)	Title of class of securities: COMMON STOCK
(e)	CUSIP No.: 23284F105
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 24688109.00
(b)	Percent of class: 14.6 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Please see the responses to Items 5 and 6 on the cover page.
	(ii) Shared power to vote or to direct the vote: 0.00
	(iii) Sole power to dispose or to direct the disposition of: 24688109.00
	(iv) Shared power to dispose or to direct the disposition of: 0.00
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. One or more other persons are known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the COMMON STOCK of CYTOMX THERAPEUTICS INC. No one other person's interest in the COMMON STOCK of CYTOMX THERAPEUTICS INC is more than five percent of the total outstanding COMMON STOCK.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See attached Exhibit 99.
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 acquired and are held in the ordinary course of business and 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.

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.

FMR LLC

Signature:	Stephanie J. Brown
Name/Title:	Duly authorized under Power of Attorney effective as of January 3, 2023, by and on behalf of FMR LLC and its direct and indirect subsidiaries*
Date:	02/04/2026

Abigail P. Johnson

Signature:	Stephanie J. Brown
Name/Title:	Duly authorized under Power of Attorney effective as of January 26, 2023, by and on behalf of Abigail P. Johnson**
Date:	02/04/2026

Comments accompanying signature: * This power of attorney is incorporated herein by reference to Exhibit 24 to the Schedule 13G filed by FMR LLC on January 10, 2023, accession number: 0000315066-23-000003. ** This power of attorney is incorporated herein by reference to Exhibit 24 to the Schedule 13G filed by FMR LLC on January 31, 2023, accession number: 0000315066-23-000038.

Exhibit Information

Please see Exhibit 99 for 13d-1(k) (1) agreement.