WPP, the world's largest advertising company, issued its second profit warning this year, causing its stock price to plummet on Wednesday. The company cited reduced client spending and a failure to attract new business as the primary reasons for the downgraded forecast. This announcement signals potential broader challenges within the advertising industry as economic uncertainty impacts marketing budgets. Investors are reacting negatively, reflecting concerns about WPP's future performance and the overall health of the advertising market. The company's struggles highlight the competitive landscape and the pressure to adapt to evolving client needs and digital advertising trends.