Netflix, MercadoLibre, and Tesla Are All Underperforming the S&P 500. Here's the 1 Stock I'd Buy in September.

Netflix, MercadoLibre, and Tesla are underperforming the S&P 500 in 2026, down 14%, 3%, and 21% respectively. Despite challenges, all three companies continue growing. The author recommends buying MercadoLibre in September, citing its strong growth trajectory in Latin American e-commerce and fintech markets at a reasonable valuation, while avoiding Tesla due to its rich valuation and uncertain robotics payoff.