RTW Investments & Roderick Wong File 13G/A; No CMPX Ownership

Rhea-AI Filing Summary

Amendment to Schedule 13G correcting an earlier administrative error. RTW Investments, LP and Roderick Wong state that, as of June 30, 2025, they did not beneficially own any ordinary shares of Compass Therapeutics, Inc.; the filing reports 0 shares and 0.0% ownership. RTW Investments is identified as an investment adviser to certain funds and Dr. Wong is identified as Managing Partner and Chief Investment Officer. The amendment clarifies that an earlier Schedule 13G related to this issuer was filed inadvertently and this filing corrects that error.

Positive

• Correction filed to address an inadvertent prior Schedule 13G, improving transparency
• Clear statement that Reporting Persons hold 0 shares (0.0%), removing ambiguity about ownership

Negative

• An earlier Schedule 13G was inadvertently filed, creating a need for this corrective amendment

Insights

Securities Analyst

TL;DR: Amendment confirms no position; administrative correction reduces ambiguity about reported ownership.

The amendment clarifies that the Reporting Persons—RTW Investments, LP and Roderick Wong—hold 0 shares (0.0%) of Compass Therapeutics, Inc. as of June 30, 2025. From a market-impact perspective, this is a corrective, non-economic disclosure: it removes potential confusion created by the earlier inadvertent filing. There is no change to ownership that would affect control, voting outcomes, or trigger statutory thresholds.

Compliance / Corporate Governance Expert

TL;DR: Filing is procedural; it documents remediation of an inadvertent filing and confirms no beneficial ownership.

The Schedule 13G/A serves to correct an administrative error and formally record that the Reporting Persons possess no voting or dispositive power over the issuer's shares. This reduces regulatory ambiguity and demonstrates adherence to reporting obligations, but it does not present material corporate-governance or control implications because reported ownership remains at 0.0%.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Compass Therapeutics, Inc.

(Name of Issuer)

Ordinary Shares, par value GBP 0.008 per share

(Title of Class of Securities)

20451W101

(CUSIP Number)

06/30/2025

(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. 20451W101

1

Names of Reporting Persons

RTW Investments, 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)

0.0 %

12

Type of Reporting Person (See Instructions)

IA, PN

Comment for Type of Reporting Person: Explanatory Note: This Amendment No. 1 to Schedule 13G (this "Amendment") is being filed to correct an administrative error in connection with the filing earlier today of a Schedule 13G by RTW Investments, LP and Roderick Wong (the "Reporting Persons"), which was inadvertently filed with the Securities and Exchange Commission with respect to Compass Therapeutics, Inc. As of June 30, 2025 the Reporting Persons did not own any shares of Compass Therapeutics, Inc. and this amendment is being filed to correct this administrative error.

SCHEDULE 13G

CUSIP No. 20451W101

1

Names of Reporting Persons

Roderick Wong

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)

0.0 %

12

Type of Reporting Person (See Instructions)

HC, IN

Comment for Type of Reporting Person: Explanatory Note: This Amendment No. 1 to Schedule 13G (this "Amendment") is being filed to correct an administrative error in connection with the filing earlier today of a Schedule 13G by RTW Investments, LP and Roderick Wong (the "Reporting Persons"), which was inadvertently filed with the Securities and Exchange Commission with respect to Compass Therapeutics, Inc. As of June 30, 2025 the Reporting Persons did not own any shares of Compass Therapeutics, Inc. and this amendment is being filed to correct this administrative error.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Compass Therapeutics, Inc.
(b)	Address of issuer's principal executive offices: 80 GUEST STREET, BOSTON, MA, 02135.
Item 2.
(a)	Name of person filing: This statement is filed by: (i) RTW Investments, LP ("RTW Investments"), a Delaware limited partnership and the investment adviser to certain funds (the "RTW Funds"), with respect to Ordinary Shares, par value GBP 0.008 per share (the "Shares") of COMPASS Pathways plc (the "Company") directly held by the RTW Funds; and (ii) Roderick Wong, M.D. ("Dr. Wong"), the Managing Partner and Chief Investment Officer of RTW Investments, with respect to the Shares directly held by the RTW Funds. The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons." The filing of this statement should not be construed as an admission that any of the foregoing persons or any Reporting Person is, for the purposes of Section 13 of the Securities Exchange Act of 1934, as amended, the beneficial owner of the Shares reported herein.
(b)	Address or principal business office or, if none, residence: The address of the business office of each of the Reporting Persons is 40 10th Avenue, Floor 7, New York, New York 10014.
(c)	Citizenship: RTW Investments is a Delaware limited partnership. Dr. Wong is a citizen of the United States.
(d)	Title of class of securities: Ordinary Shares, par value GBP 0.008 per share
(e)	CUSIP No.: 20451W101
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: The information required by Item 4(a) is set forth in Rows 5 - 9 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
(b)	Percent of class: RTW Investments: 0% Dr. Wong: 0%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: RTW Investments: 0 Dr. Wong: 0
	(ii) Shared power to vote or to direct the vote: RTW Investments: 0 Shares Dr. Wong: 0 Shares
	(iii) Sole power to dispose or to direct the disposition of: RTW Investments: 0 Dr. Wong: 0
	(iv) Shared power to dispose or to direct the disposition of: RTW Investments: 0 Shares Dr. Wong: 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 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.

RTW Investments, LP

Signature:	/s/ Roderick Wong, M.D.
Name/Title:	Roderick Wong, M.D., Managing Partner
Date:	08/14/2025

Roderick Wong

Signature:	s/ Roderick Wong, M.D.
Name/Title:	Roderick Wong, M.D.
Date:	08/14/2025

FAQ

What does the Schedule 13G/A filed by RTW Investments say about CMPX ownership?

The amendment states that RTW Investments, LP and Roderick Wong beneficially own 0 shares of Compass Therapeutics, Inc., representing 0.0% of the class as of June 30, 2025.

Why was this amendment filed for Compass Therapeutics (CMPX)?

The amendment was filed to correct an administrative error from an earlier Schedule 13G that was inadvertently submitted.

Who are the Reporting Persons in this filing?

The Reporting Persons are RTW Investments, LP (an investment adviser) and Roderick Wong, M.D. (Managing Partner and Chief Investment Officer).

Does the filing indicate any voting or dispositive power over CMPX shares?

No. The filing reports 0 sole and 0 shared voting power and 0 sole and 0 shared dispositive power for each Reporting Person.

Is there any indication the Reporting Persons own more than 5% of CMPX?

No. The filing specifies ownership of 0.0%, which is well below the 5% threshold.