Study to Evaluate Switching From a Regimen of Two Nucleos(t)Ide Reverse Transcriptase Inhibitors (NRTI) Plus a Third Agent to a Fixed Dose Combination (FDC) of Bictegravir/Emtricitabine/Tenofovir Alafenamide (B/F/TAF), in Virologically-Suppressed, HIV-1 Infected African American Participants

Key Inclusion Criteria

• Self-describes as Black, African American, or mixed race, including Black
• Currently receiving an antiretrovirals (ARV) regimen other than FDC of B/F/TAF that consists of any two NRTIs + allowed 3rd agent for ≥ 6 months
• Allowed 3rd agents include any FDA-approved INSTI, with the exception of bictegravir, any FDA-approved NNRTI with the exception of etravirine, protease inhibitors or the CCR5 antagonist, maraviroc
• If the baseline 3rd agent is dolutegravir, dosing other than 50 mg once daily is excluded
• Baseline regimens containing investigational drugs or > 2 classes of ARVs are not permitted, with the exception of the pharmacologic enhancers cobicistat (taken with elvitegravir or a PI), or ritonavir (taken with a PI)
• Have no documented or suspected resistance to INSTIs and no history of virologic failure on an INSTI containing regimen (2 consecutive HIV-1 RNA ≥ 50 copies/mL after achieving <50 copies/mL while on an INSTI-containing regimen)
• History of 1-2 thymidine analogue mutations (TAMs), M184V/I, and any other RT substitutions are allowed, with the following exceptions: History of 3 or more TAMs (M41L, D67N, K70R, L210W, T215F/Y, and K219Q/E/N/R), T69-insertions, or K65R/E/N in RT will be excluded
• Documented plasma HIV-1 RNA < 50 copies/mL during treatment with the baseline regimen for a minimum period of 6 months and at least the last two HIV-1 RNA measurements prior to the Screening visit
• HIV-1 RNA levels < 50 copies/mL at Screening
• Estimated glomerular filtration rate (eGFR) ≥ 50 mL/min according to the Cockcroft-Gault formula for creatinine clearance

Key Exclusion Criteria

• History of 3 or more TAMs (M41L, D67N, K70R, L210W, T215F/Y, and K219Q/E/N/R),T69-insertions, or K65R/E/N in RT
• No desire to switch from current ARVs
• An opportunistic illness indicative of stage 3 HIV diagnosed within the 30 days prior to screening
• Participants experiencing decompensated cirrhosis (e.g., ascites, encephalopathy, or variceal bleeding)
• Have been treated with immunosuppressant therapies or chemotherapeutic agents within 3 months of study screening, or expected to receive these agents or systemic steroids during the study (eg, corticosteroids, immunoglobulins, and other immune- or cytokine-based therapies)
• Malignancy within 5 years of screening other than cutaneous Kaposi's sarcoma, completely resected non -melanoma skin cancer (basal cell carcinoma or non-invasive cutaneous squamous carcinoma), or completely resected carcinoma in-situ of the cervix (CIN 3) or anus (AIN 3). A prior malignancy treated with curative therapy and for which there has been no evidence of disease for at least five years prior to screening is allowed
• Current alcohol or substance use judged by the Investigator to potentially interfere with participant study compliance
• Active, serious infections (other than HIV-1 infection) requiring antibiotic or antifungal therapy within 30 days prior to Day 1
• Participation in any other clinical trial, including observational studies, without prior approval from the sponsor is prohibited while participating in this trial
• Any other clinical condition or prior therapy that, in the opinion of the Investigator, would make the participant unsuitable for the study or unable to comply with the dosing requirements
• Known hypersensitivity to FDC of B/F/TAF tablets, their metabolites, or formulation excipient
• Females who are pregnant (as confirmed by positive serum pregnancy test)
• Females who are breastfeeding
• Acute hepatitis in the 30 days prior to randomization
• Active tuberculosis infection.

Note: Other protocol defined Inclusion/Exclusion criteria may apply.