Commodore Capital takes 5.5% position in Research Alliance Corp IV (RACD)

Rhea-AI Filing Summary

Research Alliance Corporation IV received a significant ownership disclosure from Commodore Capital LP, Commodore Capital Master LP, Robert Egen Atkinson, and Michael Kramarz. As of July 13, 2026, these filers may be deemed to beneficially own 500,000 Class A Ordinary Shares, representing 5.5% of the outstanding class.

The ownership is held with shared voting and dispositive power over all 500,000 shares for each filer and no sole voting or dispositive power. The percentage is based on 9,098,529 Class A Ordinary Shares outstanding as of July 10, 2026, as referenced in a Rule 424(b)(4) prospectus. Commodore Capital LP serves as investment manager to Commodore Capital Master LP, and Atkinson and Kramarz are managing partners exercising investment discretion.

Key Figures

Beneficial ownership: 500,000 Class A Ordinary Shares Ownership percentage: 5.5% Shares outstanding: 9,098,529 Class A Ordinary Shares +2 more

5 metrics

Beneficial ownership 500,000 Class A Ordinary Shares Shares beneficially owned by the filers as of July 13, 2026

Ownership percentage 5.5% Percentage of Research Alliance Corp IV Class A Ordinary Shares owned by the filers

Shares outstanding 9,098,529 Class A Ordinary Shares Outstanding shares of the issuer’s Common Shares as of July 10, 2026

Par value $0.0001 per share Par value of Research Alliance Corp IV Class A Ordinary Shares

CUSIP G75228109 CUSIP number for Class A Ordinary Shares of Research Alliance Corp IV

Key Terms

beneficially own, shared voting power, shared dispositive power, investment manager, +1 more

5 terms

beneficially own financial

"the Firm may be deemed to beneficially own an aggregate of 500,000 shares"

Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.

shared voting power financial

"Shared Voting Power 500,000.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

shared dispositive power financial

"Shared Dispositive Power 500,000.00"

investment manager financial

"The Firm is the investment manager to Commodore Master."

Rule 424(b)(4) Prospectus regulatory

"as issued in the Issuer's Rule 424(b)(4) Prospectus filed"

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

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Available on EDGAR 07/20/2026 - 04:23 PM Accepted by SEC EDGAR 07/20/2026 - 04:22 PM Learn about SEC filing dates

FAQ

What stake in Research Alliance Corp IV (RACD) does Commodore Capital report?

Commodore Capital and related filers report beneficial ownership of 500,000 Class A Ordinary Shares of Research Alliance Corporation IV, representing 5.5% of the outstanding class as of July 13, 2026, based on 9,098,529 shares outstanding.

How is the 5.5% ownership in RACD calculated in this Schedule 13G?

The 5.5% ownership is calculated using 9,098,529 Class A Ordinary Shares of Research Alliance Corporation IV outstanding as of July 10, 2026, as stated in a Rule 424(b)(4) prospectus filed on July 13, 2026.

Who are the filers on the Schedule 13G for Research Alliance Corp IV (RACD)?

The filers are Commodore Capital LP, Commodore Capital Master LP, Robert Egen Atkinson, and Michael Kramarz. Each is a “Filer,” with Commodore Capital LP acting as investment manager to Commodore Capital Master LP.

What voting and dispositive powers do the RACD Schedule 13G filers report?

Each filer reports 0 shares with sole voting or dispositive power and 500,000 shares with shared voting and shared dispositive power. This means decisions regarding these shares are made jointly rather than individually.

What are the citizenships or organizations of the RACD Schedule 13G filers?

Commodore Capital LP is organized in Delaware, Commodore Capital Master LP in the Cayman Islands, and both Robert Egen Atkinson and Michael Kramarz are citizens of the United States, as disclosed in the filing.

Where are the principal business addresses of the RACD Schedule 13G filers?

Commodore Capital LP, Robert Egen Atkinson, and Michael Kramarz list 444 Madison Avenue, Floor 35, New York, NY 10022, while Commodore Capital Master LP lists Ugland House, Grand Cayman KY1-1104, Cayman Islands.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Research Alliance Corp IV

(Name of Issuer)

Class A Ordinary Shares, par value $0.0001 per share

(Title of Class of Securities)

G75228109

(CUSIP Number)

07/13/2026

(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): G75228109

1

Names of Reporting Persons

Commodore Capital 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 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): G75228109

1

Names of Reporting Persons

Commodore Capital Master 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

CAYMAN ISLANDS

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

CUSIP Number(s): G75228109

1

Names of Reporting Persons

Robert Egen Atkinson

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): G75228109

1

Names of Reporting Persons

Michael Kramarz

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

Item 1.
(a)	Name of issuer: Research Alliance Corp IV
(b)	Address of issuer's principal executive offices: 600 Fifth Avenue, 23rd Floor, New York, NEW YORK, 10020.
Item 2.
(a)	Name of person filing: Commodore Capital LP Commodore Capital Master LP Robert Egen Atkinson Michael Kramarz Each a "Filer."
(b)	Address or principal business office or, if none, residence: The address for Commodore Capital LP, Robert Egen Atkinson, and Michael Kramarz is 444 Madison Avenue, Floor 35, New York, NY 10022. The address for Commodore Capital Master LP is c/o Maples Corporate Services Limited, Ugland House, South Church Street, PO Box 309, Grand Cayman KY1-1104, Cayman Islands.
(c)	Citizenship: See Item 4 of the cover page for each Filer.
(d)	Title of class of securities: Class A Ordinary Shares, par value $0.0001 per share
(e)	CUSIP Number(s): G75228109
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: See Item 9 of the cover page for each Filer. This report on Schedule 13G is being filed by Commodore Capital LP (the "Firm"), Commodore Capital Master LP ("Commodore Master"), Michael Kramarz, and Robert Egen Atkinson. The Firm is the investment manager to Commodore Master. As of July 13, 2026, the Firm may be deemed to beneficially own an aggregate of 500,000 shares of Class A Ordinary Shares, par value $0.0001 per share (the "Common Shares") of Research Alliance Corporation IV (the "Issuer"). The Firm, as the investment manager to Commodore Master, may be deemed to beneficially own these securities. Michael Kramarz and Robert Egen Atkinson are the managing partners of the Firm and exercise investment discretion with respect to these securities. Ownership percentages are based on 9,098,529 shares of the Issuer's Common Shares outstanding as of July 10, 2026 as issued in the Issuer's Rule 424(b)(4) Prospectus filed with the Securities and Exchange Commission on July 13, 2026.
(b)	Percent of class: See item 11 of the cover page for each Filer.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: See item 5 of the cover page for each Filer.
	(ii) Shared power to vote or to direct the vote: See item 6 of the cover page for each Filer.
	(iii) Sole power to dispose or to direct the disposition of: See item 7 of the cover page for each Filer.
	(iv) Shared power to dispose or to direct the disposition of: See item 8 of the cover page for each Filer.
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.

Commodore Capital LP

Signature:	Michael Kramarz
Name/Title:	Managing Partner
Date:	07/20/2026

Commodore Capital Master LP

Signature:	Michael Kramarz
Name/Title:	Authorized Signatory
Date:	07/20/2026

Robert Egen Atkinson

Signature:	Robert Egen Atkinson
Name/Title:	Authorized Signatory
Date:	07/20/2026

Michael Kramarz

Signature:	Michael Kramarz
Name/Title:	Authorized Signatory
Date:	07/20/2026

Exhibit Information

Exhibit 1: Joint Filing Agreement