Tesla's sales slumped for the 2nd quarter in a row, but things weren't as bad as investors feared

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• Tesla sales were down nearly 5% in the second quarter.
• The performance wasn't as bad as analysts had expected.
• Tesla's stock rose more than 8% following the news.

Tesla's sales fell for the second straight quarter, down nearly 5% compared with the same period a year ago.

While the decline in deliveries is yet another sign that an industrywide electric-vehicle...