Elon Musk, CEO of Tesla, stands on the construction site of the Tesla Gigafactory in Grünheide near Berlin, September 3, 2020.

Tesla is sitting on roughly $2.5 billion worth of bitcoin, according to a securities filing, giving the automaker a significant gain on paper just a few months after investing.

The automaker said its investment in the volatile cryptocurrency was worth $2.48 billion at the end of March. The company announced earlier this year that it had purchased $1.5 billion worth of bitcoin and planned to accept it as payment for vehicles.