A Study to Evaluate the Long-Term Safety and Efficacy of Bimekizumab in Subjects With Psoriatic Arthritis

Inclusion Criteria:

In the opinion of the Investigator, the subject is expected to benefit from participation in an Open Label Extension (OLE) study
Subject completed PA0008 without meeting any withdrawal criteria
Female subjects must be postmenopausal, permanently sterilized or, if of childbearing potential, must be willing to use a highly effective method of contraception
Male subjects with a partner of childbearing potential must be willing to use a condom when sexually active

Exclusion Criteria:

Female subjects who plan to become pregnant during the study or within 20 weeks following the last dose of IMP. Male subjects who are planning a partner pregnancy during the study or within 20 weeks following the last dose
Subjects with any current sign or symptom that may indicate a medically significant active infection (except for the common cold) or has had an infection requiring systemic antibiotics within 2 weeks of study entry
Subjects who meet any withdrawal criteria in PA0008. For any subject with an ongoing Serious Adverse Event, or a history of serious infections (including hospitalizations) in the lead-in study, the Medical Monitor must be consulted prior to the subject's entry into PA0009