Tandem Diabetes Care, Inc. (TNDM) shares soared 7.6% in the last trading session to close at $17.61. The move was backed by solid volume with far more shares changing hands than in a normal session. This compares to the stock's 8.5% loss over the past four weeks.Tandem Diabetes scored a strong price increase on investors’ optimism surrounding its impending first quarter 2025 financial results, slated to release on Apr. 30, after the closing bell. In the fourth quarter, the company’s reported sales grew by a ...