Tesla shares surged to a fresh all-time high as investors rallied around renewed optimism that the company is nearing a long-promised breakthrough in autonomous driving. The move lifted Tesla’s market capitalisation to around $1.63 trillion, cementing its position among the world’s most valuable publicly traded companies.

The immediate catalyst was confirmation from CEO Elon Musk that Tesla has begun testing fully driverless vehicles in Austin, Texas, without safety monitors onboard. For bullish investors, this development revives the long-held thesis that Tesla can convert its existing vehicle fleet into robotaxis largely through software, unlocking a high-margin, platform-style revenue stream that extends well beyond traditional auto manufacturing.

The rally also reflects a sharp reversal from earlier in the year. Tesla shares plunged 36% in the first quarter amid falling deliveries, declining automotive revenue, and mounting backlash against Musk’s political activities. However, sentiment improved in the second half as third-quarter revenue returned to growth and enthusiasm around Full Self-Driving (Supervised) intensified, helping drive a roughly 40% share-price jump since October.

Operationally, the picture remains mixed. EV demand is uneven across regions, with U.S. and European sales under pressure, offset by stronger momentum in China and expansion plans such as a €1.2bn investment in Tesla’s German battery operations. Valuation is increasingly stretched, with the stock trading on a triple-digit earnings multiple, leaving little room for execution missteps.

Looking ahead, Tesla’s outlook hinges on whether autonomous driving can transition from promise to scalable reality. Continued progress in robotaxi testing could sustain investor enthusiasm, but regulatory hurdles, safety concerns, and intensifying competition mean volatility is likely to remain a defining feature of Tesla’s next phase.