The retail coffee giant has had a difficult time lately winning over investors.Starbucks (SBUX +0.85%) is the undisputed king of the retail coffee market. As of Sept. 28, it had just under 41,000 stores globally, with 41% of them in the U.S.Yet the company's dominance in part masks its recent challenges. Shares are down by 4% in 2025 and trading 31% below their peak.Investors in the company are hoping that 2026 will be a better year for Starbucks. If you're a shareholder or considering buying the stock, her ...