Rivian shares have lost 15% over the past month. Shares could finally be a buy.As a company, Rivian Automotive (RIVN -2.79%) has performed incredibly well since going public in 2021. Over that time frame, sales have risen by more than 1,000%, breaching the $5 billion mark earlier this year. As an investment, however, Rivian's journey has been disappointing. The stock price is down big since its initial public offering (IPO), losing roughly 15% over the past month alone.But don't lose hope just yet. If you'r ...