Tang Capital reports 0% CytomX (CTMX) stake in latest 13G/A filing

Rhea-AI Filing Summary

CytomX Therapeutics, Inc. received an amended Schedule 13G filing showing that Tang Capital Management, Kevin Tang, and related Tang Capital entities now report 0 shares of CytomX common stock beneficially owned, representing 0% of the class as of 12/31/2025.

The amendment, identified as Amendment No. 6, confirms that these reporting persons no longer hold voting or dispositive power over any CytomX shares and state that their holdings are 5 percent or less of the outstanding common stock. The filing also certifies that the securities were not acquired or held for the purpose of changing or influencing control of CytomX.

Insights

Institutional ownership analyst

Tang Capital and affiliates report their CytomX stake reduced to 0%.

The filing shows Tang Capital Management, Kevin Tang, and affiliated partnerships and corporations now report 0 shares and 0% beneficial ownership of CytomX common stock as of 12/31/2025. All voting and dispositive powers are listed as zero.

This signals that a previously reportable holder has exited its disclosable position and now owns 5 percent or less of the class. Actual implications for the shareholder base depend on when and how prior shares were disposed, which is not detailed in this amendment.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 6)

CytomX Therapeutics, Inc.

(Name of Issuer)

Common Stock, par value $0.00001 per share

(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

TANG CAPITAL MANAGEMENT, 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 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

0 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

CUSIP No. 23284F105

1

Names of Reporting Persons

KEVIN TANG

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 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

0 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

CUSIP No. 23284F105

1

Names of Reporting Persons

TANG CAPITAL PARTNERS, LP

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 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

0 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

CUSIP No. 23284F105

1

Names of Reporting Persons

TANG CAPITAL PARTNERS INTERNATIONAL, LP

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 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

0 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

CUSIP No. 23284F105

1

Names of Reporting Persons

TANG CAPITAL PARTNERS III, INC

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

NEVADA

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 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

0.0 %

12

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13G

CUSIP No. 23284F105

1

Names of Reporting Persons

TANG CAPITAL PARTNERS IV, INC

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

NEVADA

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 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

0.0 %

12

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13G

Item 1.
(a)	Name of issuer: CytomX Therapeutics, Inc.
(b)	Address of issuer's principal executive offices: 151 Oyster Point Boulevard, Suite 400, South San Francisco, CA, 94080
Item 2.
(a)	Name of person filing: This Statement on Schedule 13G (this "Statement") is filed by Tang Capital Management, LLC ("TCM"), the general partner of Tang Capital Partners, LP ("TCP") and Tang Capital Partners International, LP ("TCPI"); Kevin Tang, the manager of TCM and Chief Executive Officer of Tang Capital Partners III, Inc. ("TCP III") and Tang Capital Partners IV, Inc. ("TCP IV"); TCP; TCPI; TCP III; and TCP IV.
(b)	Address or principal business office or, if none, residence: The address of TCM, Kevin Tang, TCP and TCPI is 4747 Executive Drive, Suite 210, San Diego, CA 92121. The address of TCP III and TCP IV is 400 S. 4th Street, 3rd Floor, Las Vegas, NV 89101.
(c)	Citizenship: TCM is a Delaware limited liability company. Mr. Tang is a United States citizen. TCP and TCPI are Delaware limited partnerships. TCP III and TCP IV are Nevada corporations that are indirectly wholly owned by TCP.
(d)	Title of class of securities: Common Stock, par value $0.00001 per share
(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: 0
(b)	Percent of class: 0 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0 shares
	(ii) Shared power to vote or to direct the vote: 0 shares
	(iii) Sole power to dispose or to direct the disposition of: 0 shares
	(iv) Shared power to dispose or to direct the disposition of: 0 shares
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
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 Reported 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.

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.

TANG CAPITAL MANAGEMENT, LLC

Signature:	/s/ Kevin Tang
Name/Title:	Manager
Date:	02/17/2026

KEVIN TANG

Signature:	/s/ Kevin Tang
Name/Title:	Self
Date:	02/17/2026

TANG CAPITAL PARTNERS, LP

Signature:	/s/ Kevin Tang
Name/Title:	Manager, Tang Capital Management, LLC, General Partner
Date:	02/17/2026

TANG CAPITAL PARTNERS INTERNATIONAL, LP

Signature:	/s/ Kevin Tang
Name/Title:	Manager, Tang Capital Management, LLC, General Partner
Date:	02/17/2026

TANG CAPITAL PARTNERS III, INC

Signature:	/s/ Kevin Tang
Name/Title:	Chief Executive Officer
Date:	02/17/2026

TANG CAPITAL PARTNERS IV, INC

Signature:	/s/ Kevin Tang
Name/Title:	Chief Executive Officer
Date:	02/17/2026

FAQ

What does the latest Schedule 13G/A say about Tang Capital’s CTMX ownership?

The amended Schedule 13G/A reports that Tang Capital Management, Kevin Tang, and related entities now beneficially own 0 CytomX shares, representing 0% of the common stock as of December 31, 2025. They also report no voting or dispositive power over any shares.

Which entities are reporting 0% beneficial ownership in CytomX (CTMX)?

The filing lists Tang Capital Management, LLC, Kevin Tang, Tang Capital Partners, LP, Tang Capital Partners International, LP, Tang Capital Partners III, Inc., and Tang Capital Partners IV, Inc. as each having 0 shares and 0% beneficial ownership of CytomX common stock.

What class of CytomX (CTMX) securities is covered in this 13G/A amendment?

The amendment covers CytomX Therapeutics’ common stock with a par value of $0.00001 per share, identified by CUSIP number 23284F105. All reporting persons indicate zero beneficial ownership in this specific class of securities.

As of what date is Tang Capital’s 0% CTMX ownership measured?

The reported 0 shares and 0% beneficial ownership are measured as of December 31, 2025. This date is specified as the event triggering the filing requirement for the Schedule 13G/A Amendment No. 6 related to CytomX Therapeutics.

Does Tang Capital state any intent to influence control of CytomX (CTMX)?

The certification states the securities referenced were not acquired and are not held for the purpose of changing or influencing control of CytomX. It also says they are not held in connection with any transaction having that purpose, aside from activities tied to a nomination rule reference.

Why is this CytomX (CTMX) Schedule 13G/A labeled Amendment No. 6?

The document is identified as Amendment No. 6, indicating it updates prior Schedule 13G filings concerning CytomX ownership by Tang Capital and affiliates. This amendment specifically updates their position to 0 shares and 0% beneficial ownership as of December 31, 2025.