Shares Tesla Inc. TSLA, +0.26% seesawed back into positive territory, and was last up 1.7% in premarket trading, after reports about being summoned by Chinese regulators and a disclosure that it bought $1.5 billion worth of bitcoin. The electric vehicle maker also said in its 1 0-K filing with the that it expects to start accepting bitcoin as a form of payment for products “in the near future,” subject to applicable laws.…

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