Western Alliance Bank denied reports that it’s exploring a sale or has hired an advisor to explore strategic options. Shares of the regional bank tumbled 36% Thursday, slightly paring back its losses after plunging over 50% at one point on reports that the company is the regional bank latest to explore a potential sale. It also dragged down the broader stock market: The Dow fell 400 points, or 1.2%, and the S&P 500 sank 0.9%. The Financial Times, citing two anonymous sources, reported Thursday that the Arizona-based bank is exploring strategic options.