9999999995-22-003321 EFFECT 1 20221117 20221118 20221117 Stealth BioTherapeutics Corp 0001696396 2834 000000000 E9 1231 EFFECT 33 333-237542 221400456 190 ELGIN AVENUE GEORGE TOWN GRAND CAYMAN E9 KY1-9005 617-600-6888 190 ELGIN AVENUE GEORGE TOWN GRAND CAYMAN E9 KY1-9005 EFFECT 1 primary_doc.xml UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 NOTICE OF EFFECTIVENESS Effective Date: November 17, 2022 Accession Number: 0001193125-22-286773 Submission Type: POS AM CIK: 0001696396 Company Name: Stealth BioTherapeutics Corp File Number: 333-237542