| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| SEVERE ACTIVE ULCERATIVE COLITIS |  | 
| E.1.1.1 | Medical condition in easily understood language |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Digestive System Diseases [C06] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| 
| E.1.2 | Version | 20.0 |  
| E.1.2 | Level | SOC |  
| E.1.2 | Classification code | 10017947 |  
| E.1.2 | Term | Gastrointestinal disorders |  
| E.1.2 | System Organ Class | 10017947 - Gastrointestinal disorders |  | 
| E.1.3 | Condition being studied is a rare disease | No | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial | 
| To assess the efficacy of bimekizumab in adults with active ulcerative colitis who have not responded to standard therapy. |  | 
| E.2.2 | Secondary objectives of the trial | 
| To assess the safety and PK of bimekizumab in adults with active ulcerative colitis who have not responded to standard therapy. |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| -Subject has a diagnosis of Ulcerative Colitis (UC) confirmed (at least 90 days prior to Visit 1a) by clinical, endoscopic, and histologic evidence - Subject has a Mayo endoscopy subscore >=2
 - Subject has a Mayo rectal bleeding subscore >=1
 - Subject has moderate to severe active UC - Total Mayo score 6 to 12 within 10 (±4) days prior to Visit 2 (Week 0)
 - Subject has responded inadequately to convention therapy for UC
 - Subjets may have received treamtment with 1 biological therapy or a calcineurin inhibitor
 - Woman with childbearing potential must be either postmenopausal, permanently sterilized or willing
 to use at least 1 highly effective method of contraception in addition to a barrier method
 |  | 
| E.4 | Principal exclusion criteria | 
| - Subject who has had a resective colonic surgery, or has an ostomy or ileoanal pouch or is planning any resection while enrolled in the study - Subject with current diagnosis of Crohn´s Disease (CD) or indeterminant colitis or acute diverticulitis based on medical history
 - Subject has an extension of disease limited to ulcerative proctitis (disease extension) <15cm from the anal verge
 - Subject requiring immediate surgical, endoscopic or radiological intervention due to toxic megacolo intraabdominal or perianal abscess
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| Proportion of Participants with Clinical Response (Per Mayo Score) at week 8 |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point |  | 
| E.5.2 | Secondary end point(s) | 
| -Proportion of Participants in Clinical Remission at Week 8 -Proportion of Participants with Mucosal Healing at Week 8
 -Proportion of Participants With Stool Frequency Subscore Indicative of Mild Disease (a Score of 0 or 1) at Week 8
 -Proportion of Participants With Physician's Global Assessment Subscore Indicative of Mild Disease (a Score of 0 or 1) at Week 8
 -Proportion of Participants With Rectal Bleeding Subscore Indicative of Mild Disease (a Score of 0 or 1) at Week 8
 -Change from Baseline in CRP plasma levels at Week 8
 -Incidence of Adverse Events throughout the study conduct up to Week 26
 |  | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point |  | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis | No | 
| E.6.2 | Prophylaxis | No | 
| E.6.3 | Therapy | Yes | 
| E.6.4 | Safety | Yes | 
| E.6.5 | Efficacy | Yes | 
| E.6.6 | Pharmacokinetic | Yes | 
| E.6.7 | Pharmacodynamic | Yes | 
| E.6.8 | Bioequivalence | No | 
| E.6.9 | Dose response | No | 
| E.6.10 | Pharmacogenetic | No | 
| E.6.11 | Pharmacogenomic | Yes | 
| E.6.12 | Pharmacoeconomic | No | 
| E.6.13 | Others | Yes | 
| E.6.13.1 | Other scope of the trial description |  | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) | No | 
| E.7.1.1 | First administration to humans | No | 
| E.7.1.2 | Bioequivalence study | No | 
| E.7.1.3 | Other | No | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) | Yes | 
| E.7.3 | Therapeutic confirmatory (Phase III) | No | 
| E.7.4 | Therapeutic use (Phase IV) | No | 
| E.8 Design of the trial | 
| E.8.1 | Controlled | Yes | 
| E.8.1.1 | Randomised | Yes | 
| E.8.1.2 | Open | No | 
| E.8.1.3 | Single blind | No | 
| E.8.1.4 | Double blind | Yes | 
| E.8.1.5 | Parallel group | Yes | 
| E.8.1.6 | Cross over | No | 
| E.8.1.7 | Other | No | 
| E.8.2 | Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) | No | 
| E.8.2.2 | Placebo | Yes | 
| E.8.2.3 | Other | No | 
| E.8.2.4 | Number of treatment arms in the trial | 2 | 
| E.8.3 | The trial involves single site in the Member State concerned | No | 
| E.8.4 | The trial involves multiple sites in the Member State concerned | Yes | 
| E.8.4.1 | Number of sites anticipated in Member State concerned | 2 | 
| E.8.5 | The trial involves multiple Member States | Yes | 
| E.8.5.1 | Number of sites anticipated in the EEA | 30 | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA | Yes | 
| E.8.6.2 | Trial being conducted completely outside of the EEA | No | 
| E.8.6.3 | If E.8.6.1 or E.8.6.2 are Yes, specify the regions in which trial sites are planned | 
| Czech Republic |  
| France |  
| Georgia |  
| Italy |  
| Moldova, Republic of |  
| Poland |  
| Romania |  
| South Africa |  
| Spain |  
| United Kingdom |  | 
| E.8.7 | Trial has a data monitoring committee | Yes | 
| E.8.8 | Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial | 
| Last Subject Last Visit (LSLV) |  | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 1 | 
| E.8.9.1 | In the Member State concerned months | 8 | 
| E.8.9.1 | In the Member State concerned days | 0 | 
| E.8.9.2 | In all countries concerned by the trial years | 1 | 
| E.8.9.2 | In all countries concerned by the trial months | 8 | 
| E.8.9.2 | In all countries concerned by the trial days | 0 |