JATT II Acquisition Corp. (JATT) investors file update showing 0% stake

Rhea-AI Filing Summary

JATT II Acquisition Corp. received an amended Schedule 13G filing from Commodore Capital LP, Commodore Capital Master LP, Robert Egen Atkinson, and Michael Kramarz, collectively described as Filers. The Filers report beneficial ownership of 0.00 ordinary shares of JATT II Acquisition Corp., representing 0.0% of the class of ordinary shares with a par value of $0.0001 per share. They indicate no sole or shared voting or dispositive power over the shares and state that they own 5 percent or less of the class. The filing also includes a joint filing agreement among the Filers.

Key Figures

Par value per ordinary share: $0.0001 per share Beneficially owned shares: 0.00 shares Ownership percentage: 0.0% +2 more

5 metrics

Par value per ordinary share $0.0001 per share Par value of JATT II Acquisition Corp. ordinary shares

Beneficially owned shares 0.00 shares Shares beneficially owned by each Filer

Ownership percentage 0.0% Percent of JATT ordinary share class reported by each Filer

CUSIP G50765109 CUSIP for JATT II Acquisition Corp. ordinary shares

Certification date 08/14/2026 Date signed by Michael Kramarz and Robert Egen Atkinson

Key Terms

ordinary shares, beneficially owned, dispositive power, Ownership of 5 Percent or Less of a Class, +1 more

5 terms

ordinary shares financial

"Title of class of securities: ordinary shares, par value $0.0001 per share"

Ordinary shares are a type of ownership stake in a company, giving shareholders a right to participate in the company’s profits and decision-making through voting. They are similar to owning a piece of a business, and their value can rise or fall based on the company's performance. Investors buy ordinary shares to potentially earn dividends and benefit from the company's growth over time.

beneficially owned financial

"Item 4. | Ownership (a) | Amount beneficially owned"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

dispositive power financial

"Sole Dispositive Power 0.00 8 | Shared Dispositive Power 0.00"

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.

Ownership of 5 Percent or Less of a Class regulatory

"Item 5. | Ownership of 5 Percent or Less of a Class."

Joint Filing Agreement regulatory

"Exhibit Information Exhibit 1: Joint Filing Agreement"

FAQ

What does the Schedule 13G/A filing report for JATT (JATT II Acquisition Corp.)?

The filing reports that the Filers collectively beneficially own 0.00 ordinary shares of JATT II Acquisition Corp., representing 0.0% of the outstanding class of ordinary shares with a par value of $0.0001 per share.

Who are the reporting persons in this JATT Schedule 13G/A amendment?

The reporting persons are Commodore Capital LP, Commodore Capital Master LP, Robert Egen Atkinson, and Michael Kramarz, each referred to as a Filer and party to a joint filing agreement covering their disclosures.

What ownership percentage in JATT shares do the Filers report?

The Filers report beneficial ownership of 0.0% of the class of JATT II Acquisition Corp. ordinary shares. They also indicate that they own 5 percent or less of the class, with no voting or dispositive power over any shares.

Do the Filers report any voting or dispositive power over JATT ordinary shares?

No. For each Filer, the Schedule 13G/A states 0.00 sole voting power, 0.00 shared voting power, 0.00 sole dispositive power, and 0.00 shared dispositive power with respect to JATT ordinary shares.

What class of JATT securities is covered by this Schedule 13G/A?

The filing covers ordinary shares of JATT II Acquisition Corp. with a par value of $0.0001 per share, identified by CUSIP G50765109, and reports the Filers’ current beneficial ownership in that class.

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Available on EDGAR 08/14/2026 - 04:32 PM Accepted by SEC EDGAR 08/14/2026 - 04:29 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

JATT II Acquisition Corp.

(Name of Issuer)

ordinary shares, par value $0.0001 per share

(Title of Class of Securities)

G50765109

(CUSIP Number)

06/30/2026

(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): G50765109

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 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

SCHEDULE 13G

CUSIP Number(s): G50765109

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 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)

PN

SCHEDULE 13G

CUSIP Number(s): G50765109

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 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

SCHEDULE 13G

CUSIP Number(s): G50765109

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 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

SCHEDULE 13G

Item 1.
(a)	Name of issuer: JATT II Acquisition Corp.
(b)	Address of issuer's principal executive offices: 153 Central Avenue, C/O 56, Westfield, NEW JERSEY, 07091.
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: ordinary shares, par value $0.0001 per share
(e)	CUSIP No.: G50765109
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.
(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.
	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.

Commodore Capital LP

Signature:	Michael Kramarz
Name/Title:	Managing Partner
Date:	08/14/2026

Commodore Capital Master LP

Signature:	Michael Kramarz
Name/Title:	Authorized Signatory
Date:	08/14/2026

Robert Egen Atkinson

Signature:	Robert Egen Atkinson
Name/Title:	Authorized Signatory
Date:	08/14/2026

Michael Kramarz

Signature:	Michael Kramarz
Name/Title:	Authorized Signatory
Date:	08/14/2026

Exhibit Information

Exhibit 1: Joint Filing Agreement