0001831942-26-000016.txt : 20260424 0001831942-26-000016.hdr.sgml : 20260424 20260424164844 ACCESSION NUMBER: 0001831942-26-000016 CONFORMED SUBMISSION TYPE: SCHEDULE 13G PUBLIC DOCUMENT COUNT: 2 FILED AS OF DATE: 20260424 DATE AS OF CHANGE: 20260424 SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: JATT II Acquisition Corp. CENTRAL INDEX KEY: 0002112446 STANDARD INDUSTRIAL CLASSIFICATION: BLANK CHECKS [6770] ORGANIZATION NAME: 05 Real Estate & Construction EIN: 000000000 STATE OF INCORPORATION: E9 FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SCHEDULE 13G SEC ACT: 1934 Act SEC FILE NUMBER: 005-95633 FILM NUMBER: 26895185 BUSINESS ADDRESS: ADDRESS IS A NON US LOCATION: YES STREET 1: C/O APPLEBY GLOBAL SERVICES (CAYMAN) LTD STREET 2: 71 FORT STREET, PO BOX 500 CITY: GEORGE TOWN NON US STATE TERRITORY: GRAND CAYMAN PROVINCE COUNTRY: E9 ZIP: KY1-1106 BUSINESS PHONE: 201-688-0364 MAIL ADDRESS: ADDRESS IS A NON US LOCATION: YES STREET 1: C/O APPLEBY GLOBAL SERVICES (CAYMAN) LTD STREET 2: 71 FORT STREET, PO BOX 500 CITY: GEORGE TOWN NON US STATE TERRITORY: GRAND CAYMAN PROVINCE COUNTRY: E9 ZIP: KY1-1106 FILED BY: COMPANY DATA: COMPANY CONFORMED NAME: Commodore Capital LP CENTRAL INDEX KEY: 0001831942 ORGANIZATION NAME: EIN: 832659606 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SCHEDULE 13G BUSINESS ADDRESS: STREET 1: 444 MADISON AVENUE STREET 2: 35TH FLOOR CITY: NEW YORK STATE: NY ZIP: 10022 BUSINESS PHONE: 212-256-8600 MAIL ADDRESS: STREET 1: 444 MADISON AVENUE STREET 2: 35TH FLOOR CITY: NEW YORK STATE: NY ZIP: 10022 FORMER COMPANY: FORMER CONFORMED NAME: COMMODORE CAPITAL LP DATE OF NAME CHANGE: 20201110 SCHEDULE 13G 1 primary_doc.xml X0202 SCHEDULE 13G 0001831942 XXXXXXXX LIVE ordinary shares, par value $0.0001 per share 04/17/2026 0002112446 JATT II Acquisition Corp. G50765109 153 Central Avenue C/O 56 Westfield NJ 07091 Rule 13d-1(c) Commodore Capital LP DE 0.00 500000.00 0.00 500000.00 500000.00 6.4 IA PN Commodore Capital Master LP E9 0.00 500000.00 0.00 500000.00 500000.00 6.4 PN Robert Egen Atkinson X1 0.00 500000.00 0.00 500000.00 500000.00 6.4 HC IN Michael Kramarz X1 0.00 500000.00 0.00 500000.00 500000.00 6.4 HC IN JATT II Acquisition Corp. 153 Central Avenue, C/O 56, Westfield, NEW JERSEY, 07091. Commodore Capital LP Commodore Capital Master LP Robert Egen Atkinson Michael Kramarz Each a "Filer." 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. See Item 4 of the cover page for each Filer. Y 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 April 17, 2026, the Firm may be deemed to beneficially own an aggregate of 500,000 ordinary shares, par value $0.0001 per share (the "Ordinary Shares") of JATT II Acquisition Corp. (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 7,800,000 shares of Ordinary Shares reported as issued and outstanding on April 2, 2026, in the Issuer's Rule 424(b)(4) Prospectus Supplement filed with the Securities and Exchange Commission on April 17, 2026. See Item 11 of the cover page for each Filer. See Item 5 of the cover page for each Filer. See Item 6 of the cover page for each Filer. See Item 7 of the cover page for each Filer. See Item 8 of the cover page for each Filer. Y N Y Y Y Y N 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. Exhibit 1: Joint Filing Agreement Commodore Capital LP Michael Kramarz Managing Partner 04/24/2026 Commodore Capital Master LP Michael Kramarz Authorized Signatory 04/24/2026 Robert Egen Atkinson Robert Egen Atkinson Authorized Signatory 04/24/2026 Michael Kramarz Michael Kramarz Authorized Signatory 04/24/2026 EX-1 2 exhibit1jointfilingagreement.htm

Exhibit 1

JOINT FILING AGREEMENT

The undersigned acknowledge and agree that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned, and that all subsequent amendments to this statement on Schedule 13G shall be filed on behalf of each of the undersigned without the necessity of filing additional joint acquisition statements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning it contained therein, but shall not be responsible for the completeness and accuracy of the information concerning the other, except to the extent that it knows or has reason to believe that such information is inaccurate.

 

Dated: April 24, 2026

 

By: Commodore Capital LP

By: /s/Michael Kramarz

Name: Michael Kramarz

Title: Managing Partner

 

By: Commodore Capital Master LP

By: /s/Michael Kramarz

Name: Michael Kramarz

Title: Authorized Signatory

 

By: Robert Egen Atkinson

By: /s/Robert Egen Atkinson

Name: Robert Egen Atkinson

 

By: Michael Kramarz

By: /s/ Michael Kramarz

Name: Michael Kramarz