The downward revision of the revenue outlook by STMicroelectronics is likely to negatively impact investor sentiment and the stock price in the short term. Lower than expected revenue forecasts, especially when they fall below consensus estimates, typically lead to a decrease in stock price as investors adjust their expectations. The maintenance of net Capex indicates the company's commitment to its strategic initiatives, which might mitigate some negative sentiment, but the primary focus for short-term impact is the reduced revenue outlook.