The purpose of the study is to evaluate the safety and tolerability of single ascending doses of UCB0107 administered by intravenous (iv) infusion in healthy male subjects.

Inclusion Criteria:

• Subject is male, >= 18 and <= 75 years of age
• Subject has a body mass index (BMI) >= 18.0 and < 30.0 kg/m^2, with a body weight of at least 50 kg and maximum 100 kg
• Subject is in good physical and mental health
• Subject has clinical laboratory test results within the reference ranges of the laboratory
• Subject's electrocardiogram (ECG) is considered "normal," or "abnormal" but clinically non-significant (as interpreted by the investigator)
• Male subject confirms that, during the study period and for a period of 6 months or 5 half-lives of the investigational medicinal product (IMP) (whichever is longer), when having sexual intercourse with a woman of childbearing potential, a method of efficient contraception will be used, including a barrier AND an additional highly effective contraceptive method by the female partner

Exclusion Criteria:

• Subject is an employee or direct relative of an employee of the contract research organization (CRO) or UCB
• Subject has previously been assigned to treatment in this study or in another study of the medication under investigation in this study
• Subject is considered to be a vulnerable participant
• Subject has had major surgery (including joint surgery) within 6 months prior to Screening, or has planned surgery within 6 months after study treatment
• Subject has an active infection (eg, sepsis, pneumonia, abscess) or has had a serious infection (resulting in hospitalization or requiring parenteral antibiotic treatment) within 4 weeks before the first dose of IMP