QuantumScape’s stock is soaring. Here’s what may be driving the extreme rally.

quantumscape shares surged again on wednesday, extending a rally that's drawn attention to the heavily shorted battery-tech stock. the company recently signaled some business momentum — though the exact catalyst for the latest jump isn't entirely clear from the outside. the stock is one of the most shorted names in the market, which means a sharp move higher can force short sellers to buy shares to cover their positions, amplifying the rally. quantumscape has been working on next-generation solid-state batteries for years, and any hint of commercial progress tends to move the stock dramatically.