A Study Comparing Upadacitinib (ABT-494) to Placebo in Subjects With Rheumatoid Arthritis on a Stable Dose of Conventional Synthetic Disease-Modifying Antirheumatic Drugs (csDMARDs) Who Have an Inadequate Response to csDMARDs Alone

Inclusion Criteria:

- Adult male or female, at least 18 years old.

- Diagnosis of Rheumatoid Arthritis (RA) for greater than or equal to 3 months.

- Subjects have been receiving conventional synthetic DMARD (csDMARD) therapy for
greater than or equal to 3 months and on a stable dose for greater than or equal to 4
weeks prior to the first dose of study drug. The following csDMARDs are allowed:
Methotrexate (MTX), sulfasalazine, hydroxychloroquine, chloroquine, and leflunomide.

- Meets the following minimum disease activity criteria: greater than or equal to 6
swollen joints (based on 66 joint counts) and greater than or equal to 6 tender joints
(based on 68 joint counts) at Screening and Baseline Visits.

- Subjects with prior exposure to at most one biologic DMARD (bDMARD) may be enrolled
(up to 20% of study population) if they have documented evidence of intolerance to
bDMARDs or limited exposure (less than 3 months) and have satisfied required washout
periods.

Exclusion Criteria:

- Prior exposure to any Janus kinase (JAK) inhibitor (including but not limited to
tofacitinib, baricitinib, and filgotinib).

- History of inflammatory joint disease other than RA. History of secondary Sjogren's
Syndrome is permitted.

- Subjects who are considered inadequate responders to bDMARD therapy as determined by
the Investigator.