A Study to Evaluate the Efficacy and Safety of Obinutuzumab in Participants With Systemic Lupus Erythematosus

Inclusion Criteria: * Diagnosis of SLE according to the 2019 European League Against Rheumatism/American College of Rheumatology (EULAR/ACR) Classification Criteria \>=12 weeks prior to screening * Anti-nuclear antibody (ANA) \>=1:80, or anti-dsDNA and/or anti-Sm antibodies above the upper limit of normal (ULN), as determined by the central laboratory at screening * Low C3 or low C4 or low CH50 complement as determined by the central laboratory at screening * High disease activity at screening, based on; BILAG-2004 (Category A disease in \>=1 organ system and/or Category B disease in \>=2 organ systems), Systemic Lupus Erythematosus Disease Activity Index 2000 (SLEDAI-2K) (score \>=8) and Physician's Global Assessment (PGA) (score \>=1.0 on a 0 to 3 visual analogue scale \[VAS\]) * High disease activity on Day 1, based on; SLEDAI-2K (score \>=8) and PGA (score \>=1.0 on a 0 to 3 VAS) * Current receipt of \>=1 of the following classes of standard therapies for the treatment of SLE at stable doses: oral corticosteroid (OCS), antimalarials, conventional immunosuppressants * Other inclusion criteria may apply * The Medical Monitor may be consulted if there are any questions related to eligibility criteria Exclusion Criteria: * Pregnancy or breastfeeding * Presence of significant lupus-associated renal disease and/or renal impairment * Receipt of an excluded therapy, including any anti-CD20, anti-CD19 therapy less than 9 months prior to screening or during screening; or cyclophosphamide, tacrolimus, ciclosporin, or voclosporin during the 2 months prior to screening or during screening * Significant or uncontrolled medical disease which, in the investigator's opinion, would preclude patient participation * Known active infection of any kind or recent major episode of infection * Intolerance or contraindication to study therapies * Other exclusion criteria may apply