QS stock declines sharply year-to-date despite progress in solid-state battery partnerships and commercialization efforts.
QuantumScape (NASDAQ: QS) shares fell 27.4% in the first half of 2026, contrasting with its solid-state battery technology advancements. The drop follows a 2025 rally where the stock doubled on key milestones, including deals with Volkswagen’s PowerCo and partnerships with Corning and Murata.
The company achieved production integration of its ceramic separators and demonstrated real-world applications, such as a Ducati motorcycle powered by its batteries. Recent progress includes a joint development agreement with Honda’s R&D arm to enhance its battery platform.
Despite these developments, investor sentiment has shifted, reflecting broader market concerns or valuation adjustments in the EV battery sector.