{"url_path":"/sec/caba/10-q/2026/item-6","section_key":"item-6","section_title":"Item 6 Exhibits.","topic":"sec","document":{"doc_type":"10-Q","doc_date":"2026-05-14","source_url":"https://www.sec.gov/Archives/edgar/data/1759138/0001759138-26-000026-index.html","accession_number":"0001759138-26-000026","cik":"0001759138","ticker":"CABA","issuer_name":"Cabaletta Bio, Inc.","edgar_url":"https://www.sec.gov/Archives/edgar/data/1759138/0001759138-26-000026-index.html","primary_entity_key":"0001759138","primary_entity_name":"Cabaletta Bio, Inc."},"word_count":543,"has_tables":true,"body_markdown":"Item 6. Exhibits.\n\n \n\nThe exhibits listed on the Exhibit Index immediately preceding such exhibits, which is incorporated herein by reference, are filed or furnished as part of this Quarterly Report on Form 10-Q.\n\n \n\nExhibit\n\nNumber\n\nDescription\n\n3.1\n\n \n\n[Third Amended and Restated Certificate of Incorporation of the Registrant, as currently in effect (incorporated by reference to Exhibit 3.1 to the Registrant’s current report on Form 8-K (File No. 001-39103) filed with the SEC on October 30, 2019)](https://www.sec.gov/Archives/edgar/data/1759138/000119312519278927/d759120dex31.htm)\n\n3.2\n\n \n\n[Certificate of Amendment to the Third Amended and Restated Certificate of Incorporation of the Registrant (incorporated by reference to Exhibit 3.1 to the Registrant’s current report on Form 8-K (File No. 001-39103) filed with the SEC on June 10, 2025)](https://www.sec.gov/Archives/edgar/data/1759138/000119312525137954/d46354dex31.htm)\n\n3.3\n\n \n\n[Amended and Restated Bylaws of the Registrant, as currently in effect (incorporated by reference to Exhibit 3.2 to the Registrant’s current report on Form 8-K (File No. 001-39103) filed with the SEC on October 30, 2019)](https://www.sec.gov/Archives/edgar/data/1759138/000119312519278927/d759120dex32.htm)\n\n3.4\n\n \n\n[Amendment No. 1 to the Amended and Restated Bylaws of the Registrant (incorporated by reference to Exhibit 3.3 to the Registrant's Quarterly Report on Form 10-Q (File No. 001-39103) filed with the SEC on May 12, 2022)](https://www.sec.gov/Archives/edgar/data/1759138/000156459022019677/caba-ex33_49.htm)\n\n10.1\n\n \n\n[Development and Manufacturing Services Agreement, dated as of January 11, 2026, between the Registrant and Cellares Corporation (incorporated by reference to Exhibit 10.38 to the Registrant’s Annual Report on Form 10-K (File No. 001-39103) filed with the SEC on March 23, 2026)](https://www.sec.gov/Archives/edgar/data/1759138/000175913826000011/caba-ex10_38.htm)\n\n31.1*\n\n \n\n[Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002](caba-ex31_1.htm)\n\n31.2*\n\n[Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002](caba-ex31_2.htm)\n\n32.1**\n\n[Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002](caba-ex32_1.htm)\n\n32.2**\n\n[Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002](caba-ex32_2.htm)\n\n101.INS*\n\nInline XBRL Instance Document – the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document\n\n101.SCH*\n\n \n\nInline XBRL Taxonomy Extension Schema Document\n\n104*\n\n \n\nCover Page Interactive Data File (formatted as Inline XBRL with applicable taxonomy extension information contained in Exhibits 101*)\n\n \n\n* Filed herewith.\n\n** This certification will not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section. Such certification will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except to the extent specifically incorporated by reference into such filing.\n\n100\n\n \n\nSIGNATURES\n\nPursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.\n\n \n\nCabaletta Bio, Inc.\n\n \n\n \n\n \n\n \n\nDate: May 14, 2026\n\nBy:\n\n/s/ Steven Nichtberger\n\nSteven Nichtberger\n\nChief Executive Officer and President\n\n(Principal Executive Officer)\n\n \n\nDate: May 14, 2026\n\nBy:\n\n/s/ Anup Marda\n\nAnup Marda\n\nChief Financial Officer\n\n(Principal Financial and Accounting Officer)\n\n \n\n101"}