Justin Sullivan / Getty Images Tesla's shares were the best performers in the Magnificent Seven in the third quarter. Key Takeaways Shares of Tesla retreated Thursday even after the company turned in third-quarter deliveries that came in stronger than Wall Street anticipated. But looking back, investors have been baking all kinds of optimism into Tesla's valuation lately; the EV maker's shares outperformed the rest of the Magnificent Seven in the third quarter. Tesla's stock isn't having a big day ...