A Proof-of-Concept Trial to Study the Safety and Activity of Linvoseltamab in Adult Participants With Smoldering Multiple Myeloma at High Risk of Developing Multiple Myeloma

Key Inclusion Criteria: 1. High-risk SMM diagnosis within 5 years of study enrollment, as described in the protocol 2. Eastern Cooperative Oncology Group (ECOG) performance status ≤1 3. Adequate hematologic and hepatic function, as described in the protocol 4. Estimated glomerular filtration rate ≥30 mL/min/1.73 m\^2 Key Exclusion Criteria: 1. Evidence of myeloma defining events \*SLiM CRAB, as described in the protocol \*SLiM (greater than or equal to Sixty percent clonal plasma cells in the bone marrow, involved/uninvolved free Light chain ratio of ≥100 with the involved free light chain (FLC) being ≥100 mg/L, MRI with \>1 focal lesion) CRAB (hyperCalcemia, Renal insufficiency, Anemia, or lytic Bone lesions) 2. Diagnosis of systemic light chain amyloidosis, Waldenström macroglobulinemia (lymphoplasmacytic lymphoma), soft tissue plasmacytoma, or symptomatic multiple myeloma 3. Clinically significant cardiac or vascular disease within 3 months of study enrollment, as described in the protocol 4. Any infection requiring hospitalization or treatment with intravenous anti-infectives within 28 days of first dose of study drug 5. Uncontrolled Human Immunodeficiency Virus (HIV), Hepatitis B Virus (HBV), or Hepatitis C Virus (HCV) infection; or other uncontrolled infection or unexplained signs of infection, as described in the protocol 6. History of severe allergic reaction attributed to compounds with a similar chemical or biologic composition as the study drug or excipient NOTE: Other protocol defined inclusion/exclusion criteria apply