The purpose of the current Phase 1/2a single dose, dose-escalating study is to evaluate the acute safety, pharmacokinetics (PK) and pharmacodynamics (PD) properties of MOD-5014 in adult subjects with moderate/severe congenital hemophilia A or B. This will be a single-dose, open label, dose-escalating study. Each dose cohort will be concluded by a safety review, following which escalation to the next dose cohort will be approved.

Inclusion Criteria:

• Diagnosis of moderate or severe congenital Hemophilia A or B with or without inhibitors

Exclusion Criteria:

• Diagnosis of any coagulation disorder other than Hemophilia A or B
• Receipt of any immunomodulatory therapy within 3 months prior to screening, with the exception of Hepatitis C or HIV therapy
• Have had, within one month prior to study drug administration, a major surgical procedure (e.g. orthopedic, abdominal) or have an elective surgery planned within the study period
• Use of any anticoagulant for arterial/venous obstructions and/or atrial fibrillation within 7 days prior to first study drug administration
• Malignancy within past 5 years (excluding non-melanoma skin cancer)