Options market maker Group One purchased 13.5% of MicroStrategy’s share, according to a Jan. 10 SEC filing.

The trading firm holds roughly 1.3 million shares of MicroStrategy. The filing did not state the amount the shares were purchased.

Following the news, the Michael Saylor-led firm shares rose 8.57% to 0 as of press time.

MicroStrategy’s share MSTR had declined by more than 70% in the past year due to the broader market decline that saw Bitcoin trade at record lows.

MicroStrategy is one of the largest Bitcoin holders. The company purchased 2,395 BTC between Nov. 1 and Dec. 21 to take its total holdings to 132,500 BTC.

According to Group One’s website, the firm is one of the largest, privately held options trading firms in the United States. It added that it maintains a physical presence on the Chicago Board Options Exchange, New York Stock Exchange Amex, and Arca and Nasdaq PHLX.

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