The positive business update from Ardelyx, including the expected market share and revenue projections for Ibsrela, is a strong indicator of potential growth. The announcement of strategic initiatives such as R&D investment and international expansion further supports the positive outlook. The high short interest in ARDX shares suggests that the stock's significant price movement may be partly due to a short squeeze, where short sellers are forced to buy shares to cover their positions as the price rises, potentially leading to further upward pressure on the stock price in the short term.