A Research Study Investigating Mim8 in Adults and Adolescents With Haemophilia A With or Without Inhibitors

Prior treatment

• Previous participation in this study. Participation is defined as signed informed consent.
• Receipt of gene therapy at any given time point.
• Ongoing or planned immune tolerance induction (ITI) therapy.
• Major surgery planned to take place after screening.
• Previous or current thromboembolic disease or events (with the exception of previous catheter-associated thrombosis for which anti-thrombotic treatment is not currently ongoing) or risk of thromboembolic disease, as evaluated by investigator.

Other illness

• Exposure to non-factor haemostatic products for bleeding prophylaxis within 6 months (or 5 half-lives of the medicinal product, whichever is shorter) before planned randomisation, for participants not included in the run-in.
• Any disorder, except for conditions associated with haemophilia A, which in the investigator's opinion might jeopardise participant's safety or compliance with the protocol.
• Known or suspected hypersensitivity to trial product(s), any constituents of the product or to related products.
• Known congenital or acquired coagulation disorders other than haemophilia A.

Lab values

• Hepatic dysfunction defined as aspartate aminotransferase (AST) and/or alanine aminotransferase (ALT) above 3 times the upper limit combined with total bilirubin above1.5 times the upper limit measured at screening.
• Renal impairment defined as estimated Glomerular Filtration Rate (eGFR) below or equal to 30 ml/min/1.73 m\^2 for serum creatinine measured at screening.
• Other conditions (e.g., autoimmune disease) or laboratory abnormality that may increase risk of bleeding or thrombosis as evaluated by the investigator.

Other

• Participation (i.e., signed informed consent) in any interventional clinical study with receipt of the last dose within 6 months (or 5 half-lives of the investigational medicinal product, whichever is shorter) before planned randomisation.
• Female who is pregnant, breast-feeding or intends to become pregnant or is of child-bearing potential and not using a highly effective contraceptive method. Breast feeding is allowed only during the run-in period.
• Mental incapacity, unwillingness to cooperate, or a language barrier precluding adequate understanding and cooperation.

• Informed consent obtained before any study-related activities. Study-related activities are any procedures that are carried out as part of the study, including activities to determine suitability for the study.
• Male or female participants with diagnosis of congenital haemophilia A of any severity based on medical records.
• Participant has been prescribed treatment with factor VIII concentrates or bypassing agent in the last 26 weeks prior to screening.
• Age above or equal to 12 years at the time of signing informed consent.
• Body weight greater than or equal to 30 kg.
• Applicable to participants treated with on-demand/no prophylaxis prior to enrolment: ≥5 bleeds in the last 26 weeks prior to screening visit, for which factor VIII concentrates or bypassing agent has been prescribed.
• Applicable to participants with FVIII activity ≥1% who are on prophylactic treatment: ≥1 bleed in the last 26 weeks prior to screening visit, for which factor VIII concentrates or bypassing agent has been prescribed.
• Willingness and ability to comply with scheduled visits and study procedures, including the completion of diary and patient-reported outcomes questionnaires.