The filing of a prospectus for offering up to 2.5 million shares of common stock by Perma-Fix Environmental Services (PESI) is likely to have a short-term negative impact on the stock price. This is because the issuance of new shares typically dilutes the value of existing shares, leading to a decrease in the stock price. The news is highly relevant to PESI as it directly pertains to the company's equity actions. The importance of this news for investors is high, as it may affect the value of their holdings. The confidence in this analysis is 90% based on the direct relation between stock offerings and potential stock price impact.