9999999995-20-000726 EFFECT 1 20200410 20200413 20200410 Stealth BioTherapeutics Corp 0001696396 2834 000000000 E9 1231 EFFECT 33 333-237542 20787726 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: April 10, 2020 Form: F-3 CIK: 0001696396 Company Name: Stealth BioTherapeutics Corp File Number: 333-237542