Rivian sold an estimated 4,537 vehicles in the United States in August, down 6.0% from a year earlier and 3.5% from July, according to data published on Tuesday by Motor Intelligence. August was the second full month of R2 customer deliveries and ended a two-month streak of year-over-year gains. July’s 4,700 units — the strongest month of the year — had posted an 11.9% year-over-year increase in what was the first full calendar month of R2 handovers. Motor Intelligence has previously revised its historical estimates for several brands in recent months, including a June adjustment that added more than 600 units to Rivian’s tally and turned a reported decline into a 22.1% year-over-year gain. Year-to-date, Motor Intelligence estimates place Rivian’s US retail sales at 28,929 units through eight months, still 4.4% below 30,249 over the same period in 2025. The Monthly Trajectory Rivian’s 2026 monthly US sales series has traced a clear arc shaped by the R2 ramp. January opened at 2,516 units — down 18% year over year — followed by 2,700 in February, 3,628 in March and 3,480 in April. May dropped to 3,100 before Rivian opened customer orders of the R2 in early June. June jumped to 4,268, July climbed further to 4,700, and August pulled back to 4,537 units. Five of the eight months have logged year-over-year declines. Every month since the R2 reached buyers has posted volumes above 4,000, a threshold Rivian crossed only twice in the January-to-May stretch. Motor Intelligence‘s estimates cover US retail sales in its passenger-car and light-truck categories — capturing the R1T, R1S and R2 but structurally excluding Rivian’s EDV commercial vans, which are not retail vehicles. How Rivals Fared The same Motor Intelligence table shows all four publicly tracked EV makers declining year over year in August. Tesla was estimated