Tesla Inc. shares rallied sharply in midday New York trading on Monday, climbing as much as 9.6% to trade above $350. The move put the electric-vehicle maker on course for its strongest single-day performance since 9 April. Market participants pointed to a technical breakout after the stock cleared earlier resistance near $333 and $340, triggering brisk buying and a surge in 30-day implied volatility. No company announcements or regulatory filings accompanied the advance.