Radnet's underwritten offering may have a neutral impact on its stock price in the short term. The offering will raise $225 million in gross proceeds, which can be used for various purposes such as debt repayment, acquisitions, or general corporate purposes. However, the issuance of new shares may dilute existing shareholders' ownership, which could put downward pressure on the stock price. The overall impact on the stock price will depend on how the market perceives the use of proceeds and the potential dilution effect.