Sweetgreen (SG 0.21%) made a splash with its initial public offering (IPO) in November 2021, but not in a good way. Shares of the health-forward fast-casual chain tanked not long after their debut. Exactly two years following the company's IPO, they had lost a gut-wrenching 80% of their starting value.While Sweetgreen failed to satisfy investors' appetites early on, it has turned things around. Since the start of 2024, shares have surged 70% (as of April 25). However, volatility remains the key theme.In 202 ...