A Study of GS-5423 and GS-2872 in Combination With Capsid Inhibitor Lenacapavir in Virologically Suppressed Adults With HIV-1 Infection

Key Inclusion Criteria:

• On stable oral antiretroviral therapy (ART) consisting of no more than 2 drugclasses (with the exception of pharmacologic boosters cobicistat or ritonavir) for ≥ 1 year prior to screening visit 2. A change in ART regimen ≥ 28 days prior toscreening visit 2 for reasons other than virologic failure (VF) (eg, tolerability,simplification, drug-drug interaction profile) is allowed.

• No clinically significant documented historical resistance to the current ARTregimen with the exception of isolated nucleoside reverse transcriptase inhibitormutations including M184V or ≤ 2 thymidine analog mutations (TAMs: M41L, D67N, K70R,L210W, T215Y, and/or K219Q).

• Plasma HIV-1 RNA < 50 copies/mL at screening visit 2.

• Documented plasma HIV-1 RNA < 50 copies/mL for ≥ 12 months preceding screening visit 2 (or undetectable HIV-1 RNA level according to the local assay being used if thelimit of detection is ≥ 50 copies/mL). Virologic elevations of ≥ 50 copies/mL (transient detectable viremia or "blips") prior to screening are acceptable.

• Proviral pheynotypic sensitivity to both teropavimab and zinlirvimab at screening orfrom protocol GS-US-536-5816 within 24 months prior to screening.

• Screening CD4+ T-cell count ≥ 200 cells/μL at screening visit 2.

Key Exclusion Criteria:

• Comorbid condition requiring ongoing immunosuppression.

• Evidence of hepatitis C virus (HCV) infection (prior infection cleared spontaneouslyor with treatment is acceptable)

• Evidence of current hepatitis B virus (HBV) infection regardless of HBV surfaceantigen status, at the screening visit 2.

• History of opportunistic infection or illness indicative of Stage 3 HIV disease.

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