RA Capital holds 5.5% of TCGX Acquisition Corp.

TCGX Acquisition Corp. (TCGX) is reported to have 500,000 Class A ordinary shares held by RA Capital Healthcare Fund, L.P., representing 5.5% of the Class A shares.

Rhea-AI Filing Summary

TCGX Acquisition Corp. (TCGX) is reported to have 500,000 Class A ordinary shares held by RA Capital Healthcare Fund, L.P., representing 5.5% of the Class A shares. This ownership percentage is based on 9,147,500 Class A ordinary shares outstanding as of August 6, 2026.

RA Capital Management, L.P. serves as investment adviser to the Fund and has been delegated the sole power to vote and dispose of the Fund’s TCGX shares. RA Capital, Peter Kolchinsky, and Rajeev Shah may be deemed beneficial owners for Section 13(d) purposes but each disclaims beneficial ownership other than for determining reporting obligations.

Key Figures

Shares beneficially owned: 500,000 Class A ordinary shares Percent of class: 5.5% Shares outstanding: 9,147,500 Class A ordinary shares +2 more

5 metrics

Shares beneficially owned 500,000 Class A ordinary shares Directly held by RA Capital Healthcare Fund, L.P.

Percent of class 5.5% Percentage of TCGX Class A ordinary shares reported as beneficially owned

Shares outstanding 9,147,500 Class A ordinary shares Outstanding as of August 6, 2026, per issuer’s final prospectus

Par value $0.0001 per share Par value of TCGX Class A ordinary shares

Delegation notice period 61 days Minimum notice required for the Fund to revoke delegation of voting and investment power

Key Terms

beneficial owner, Section 13(d) of the Act, investment adviser, dispositive power, +1 more

5 terms

beneficial owner financial

"may be deemed a beneficial owner, for purposes of Section 13(d) of the Act"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

Section 13(d) of the Act regulatory

"for purposes of Section 13(d) of the Act, of any securities of the Issuer"

investment adviser financial

"RA Capital serves as investment adviser for the Fund and may be deemed"

An investment adviser is a person or firm that professionally manages money and gives recommendations about buying, selling, or holding investments. Like a financial coach or guide, they have a legal duty to act in a client's best financial interest, so their advice, fees and potential conflicts can directly affect returns and risk — making their role important for investors who want informed, accountable help with portfolios.

dispositive power financial

"sole power to dispose of all securities held in the Fund's portfolio"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

percent of class financial

"sets forth the percentages of Class A ordinary shares of the Issuer"

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many TCGX Acquisition Corp. (TCGX) shares are reported as beneficially owned?

The report states that RA Capital Healthcare Fund, L.P. directly holds 500,000 Class A ordinary shares of TCGX Acquisition Corp., with RA Capital Management, L.P., Peter Kolchinsky, and Rajeev Shah potentially deemed beneficial owners for Section 13(d) reporting purposes.

What percentage of TCGX (TCGX) does RA Capital’s group report owning?

The Reporting Persons state beneficial ownership of 5.5% of TCGX’s Class A ordinary shares. This percentage is calculated based on 9,147,500 Class A ordinary shares outstanding as of August 6, 2026, as reported in the issuer’s final prospectus.

Who actually holds the TCGX (TCGX) shares and who controls voting and disposition?

The shares are directly held by RA Capital Healthcare Fund, L.P.. The Fund has delegated to RA Capital Management, L.P. the sole power to vote and the sole power to dispose of all its TCGX shares, and cannot revoke this delegation on less than 61 days’ notice.

Do RA Capital, Peter Kolchinsky, and Rajeev Shah claim full beneficial ownership of TCGX (TCGX) shares?

RA Capital, Peter Kolchinsky, and Rajeev Shah state they may be deemed beneficial owners under Section 13(d) but each expressly disclaims beneficial ownership of the reported securities, except for determining their reporting obligations.

What is the class and par value of the TCGX (TCGX) securities involved?

The securities reported are Class A Ordinary Shares of TCGX Acquisition Corp., with a par value of $0.0001 per share. The CUSIP number for this class is G8708J109.

Where are TCGX Acquisition Corp. (TCGX) and RA Capital based according to the report?

TCGX Acquisition Corp.’s principal executive offices are at 245 Lytton Ave., Suite 350, Palo Alto, CA 94301. The Reporting Persons’ principal business office is listed as 200 Berkeley Street, 18th Floor, Boston, MA 02116.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/21/2026 - 12:58 PM Accepted by SEC EDGAR 08/13/2026 - 04:15 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

TCGX Acquisition Corp.

(Name of Issuer)

Class A Ordinary Shares, par value $0.0001 per share

(Title of Class of Securities)

G8708J109

(CUSIP Number)

08/06/2026

(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)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): G8708J109

1

Names of Reporting Persons

RA Capital Management, L.P.

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 500,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 500,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

500,000.00

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)

5.5 %

12

Type of Reporting Person (See Instructions)

IA, PN

SCHEDULE 13G

CUSIP Number(s): G8708J109

1

Names of Reporting Persons

Peter Kolchinsky

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 500,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 500,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

500,000.00

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)

5.5 %

12

Type of Reporting Person (See Instructions)

HC, IN

SCHEDULE 13G

CUSIP Number(s): G8708J109

1

Names of Reporting Persons

Rajeev Shah

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 500,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 500,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

500,000.00

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)

5.5 %

12

Type of Reporting Person (See Instructions)

HC, IN

SCHEDULE 13G

CUSIP Number(s): G8708J109

1

Names of Reporting Persons

RA Capital Healthcare Fund, L.P.

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 500,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 500,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

500,000.00

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)

5.5 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: TCGX Acquisition Corp.
(b)	Address of issuer's principal executive offices: 245 Lytton Ave., Suite 350, Palo Alto, CA, 94301.
Item 2.
(a)	Name of person filing: The names of the persons filing this report (collectively, the "Reporting Persons") are: RA Capital Management, L.P. ("RA Capital") Peter Kolchinsky ("Dr. Kolchinsky") Rajeev Shah ("Mr. Shah") RA Capital Healthcare Fund, L.P. (the "Fund") The Reporting Persons expressly disclaim status as a "group" for purposes of this Schedule 13G.
(b)	Address or principal business office or, if none, residence: The address of the principal business office of each of the Reporting Persons is: c/o RA Capital Management, L.P., 200 Berkeley Street, 18th Floor, Boston MA 02116
(c)	Citizenship: RA Capital and the Fund are Delaware limited partnerships. Dr. Kolchinsky and Mr. Shah are United States citizens.
(d)	Title of class of securities: Class A Ordinary Shares, par value $0.0001 per share
(e)	CUSIP Number(s): G8708J109
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: Row 9 of each Reporting Person's cover page to this Schedule 13G sets forth the aggregate number of ordinary shares of the Issuer beneficially owned by such Reporting Person and is incorporated by reference. The Fund directly holds 500,000 Class A ordinary shares. RA Capital Healthcare Fund GP, LLC is the general partner of the Fund. The general partner of RA Capital is RA Capital Management GP, LLC, of which Dr. Kolchinsky and Mr. Shah are the controlling persons. RA Capital serves as investment adviser for the Fund and may be deemed a beneficial owner, for purposes of Section 13(d) of the Act, of any securities of the Issuer held by the Fund. The Fund has delegated to RA Capital the sole power to vote and the sole power to dispose of all securities held in the Fund's portfolio, including the Class A ordinary shares of the Issuer reported herein. Because the Fund has divested voting and investment power over the reported securities it holds and may not revoke that delegation on less than 61 days' notice, the Fund disclaims beneficial ownership of the securities it holds for purposes of Section 13(d) of the Act. As managers of RA Capital, Dr. Kolchinsky and Mr. Shah may be deemed beneficial owners, for purposes of Section 13(d) of the Act, of any securities of the Issuer beneficially owned by RA Capital. RA Capital, Dr. Kolchinsky, and Mr. Shah disclaim beneficial ownership of the securities reported in this Schedule 13G other than for the purpose of determining their obligations under Section 13(d) of the Act, and the filing of this Schedule 13G shall not be deemed an admission that either RA Capital, Dr. Kolchinsky, or Mr. Shah is the beneficial owner of such securities for any other purpose.
(b)	Percent of class: Row 11 of each Reporting Person's cover page to this Schedule 13G sets forth the percentages of Class A ordinary shares of the Issuer beneficially owned by such Reporting Person and is incorporated by reference. Such percentage is based upon 9,147,500 Class A ordinary shares outstanding as of August 6, 2026, as reported in the Issuer's final prospectus dated August 6, 2026 filed with the Securities and Exchange Commission (the "SEC") on August 6, 2026.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Row 5 of each Reporting Person's cover page to this Schedule 13G sets forth the sole power to vote or to direct the vote of securities of the Issuer beneficially owned by such Reporting Person and is incorporated by reference.
	(ii) Shared power to vote or to direct the vote: Row 6 of each Reporting Person's cover page to this Schedule 13G sets forth the shared power to vote or to direct the vote of securities of the Issuer beneficially owned by such Reporting Person and is incorporated by reference.
	(iii) Sole power to dispose or to direct the disposition of: Row 7 of each Reporting Person's cover page to this Schedule 13G sets forth the sole power to dispose or to direct the disposition of securities of the Issuer beneficially owned by such Reporting Person and is incorporated by reference.
	(iv) Shared power to dispose or to direct the disposition of: Row 8 of each Reporting Person's cover page to this Schedule 13G sets forth the shared power to dispose or to direct the disposition of securities of the Issuer beneficially owned by such Reporting Person and is incorporated by reference.
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.
	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.

RA Capital Management, L.P.

Signature:	/s/ Peter Kolchinsky
Name/Title:	By Peter Kolchinsky, Authorized Signatory
Date:	08/13/2026

Peter Kolchinsky

Signature:	/s/ Peter Kolchinsky
Name/Title:	Peter Kolchinsky
Date:	08/13/2026

Rajeev Shah

Signature:	/s/ Rajeev Shah
Name/Title:	Rajeev Shah
Date:	08/13/2026

RA Capital Healthcare Fund, L.P.

Signature:	/s/ Peter Kolchinsky
Name/Title:	By RA Capital Healthcare Fund GP, LLC, its General Partner, By Peter Kolchinsky, Manager
Date:	08/13/2026

Exhibit Information

Exhibit 99.1 Joint Filing Agreement