The announcement of workforce reduction by Snap Inc. is likely to have a negative short-term impact on its stock price due to the associated costs and potential disruptions. The pre-tax charges of $55M to $75M indicate significant financial implications, and the reduction in workforce could be perceived as a sign of underlying issues within the company or a response to external pressures, such as economic downturns or competitive challenges. This news could lead to investor uncertainty and a negative perception of the company's future growth prospects.