Tesla’s stock shed value Tuesday after CEO Elon Musk said that a deal with Hertz, the largest single electric vehicle purchase, has not yet been finalized.

Last week, Tesla hit a $1 trillion market capitalization on news that car rental giant Hertz had agreed to purchase 100,000 Tesla vehicles in an effort to expand its fleet. Musk commented on the growth Monday night over Twitter and said that it should not have moved Tesla’s valuation.

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