Earnings reports are critical events for investors as they reflect a company's financial health and future prospects. A worse-than-expected earnings report typically results in a negative short-term impact on the company's stock price as it may lead to a reassessment of the company's valuation and future earnings potential. Given that BrightView's Q4 results were below expectations, it is likely that investors will react negatively, leading to a short-term decline in the stock price.