MongoDB shares fell over 20% in Tuesday's session after the database software company gave weaker-than-expected forecasts for full-year revenue and first-quarter adjusted earnings. Its fiscal 2027 sales-growth outlook was below consensus, reviving analyst and investor concern about expansion amid an intensifying product race, and signaling rising competition and slower expansion of customer wallets. The company's recent quarters showed better execution, but 2027's revenue guidance implies year-o...