Options trading firm Group One took a "beneficial ownership" position in MicroStrategy that includes the option to buy 1.26 million shares of Class A common stock, according to a document filed with the U.S. Securities and Exchange Commission.
Microstrategy shares closed up 8.6%.
MicroStrategy is one of the largest holders of bitcoin, with a total of about 132,500 BTC as of Dec. 28.
Based in Chicago, Group One has been in business since 1989 and mostly operates in the options trading market, it says on its website. It maintains a physical presence on the Chicago Board Options Exchange, New York Stock Exchange Amex and Arca and Nasdaq PHLX.
The firm didn't immediately respond to a request for comment.
(Corrects earlier story that referred to the purchase as an equity stake.)
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