A Phase 3, Randomized, Open-Label, Multicenter Study of Amivantamab in Addition to Carboplatin and Pembrolizumab, Compared to Standard of Care Platinum and Pembrolizumab and 5-FU, in Participants with Treatment-Naïve Recurrent/Metastatic Head and Neck Squamous Cell Carcinoma.

Inclusion criteria: - Be more than or equal to (>=) 18 years of age (or the legal age of majority in the jurisdiction in which the study is taking place, whichever is greater) - Have histologically or cytologically confirmed recurrent/metastatic (R/M) HNSCC that is considered incurable by local therapies: a. eligible primary tumor locations are the oral cavity, oropharynx, hypopharynx, or larynx; b. Must not have a primary tumor site of nasopharynx or primary tumor of unknown location; c. Must have documented local testing results per local regulations; d. Human papillomavirus (HPV) status must be known for participants with primary tumor location in oropharynx via p16 test, HPV DNA test, or high-risk HPV in situ hybridization (ISH). Any known p16, HPV DNA, or high-risk HPV ISH status of tumor must be negative - Be treatment-naive for systemic therapy in the R/M setting - Have an ECOG performance status of 0 or 1 - Have measurable disease according to Response Evaluation Criteria in Solid Tumors (RECIST) version (v).1.1 Exclusion criteria: - Have an uncontrolled illness - Have untreated brain metastases or history of known presence of leptomeningeal disease - Have a history of clinically significant cardiovascular disease - Inadequate organ or bone marrow function - Known allergies, hypersensitivity, contraindications, or intolerance to excipients of: Amivantamab, Pembrolizumab, Carboplatin, Cisplatin, 5-FU and Hyaluronidase