Options market maker Group One bought a 13.5% stake in MicroStrategy, according to a Jan. 10 SEC filing.
The trading firm holds about 1.3 million MicroStrategy shares, and the filing did not specify the amount for which the shares were purchased.
Following the news, shares of the Michael Saylor-led company rose 8.57% to $190 at press time.
MicroStrategy's stock, MSTR, has fallen more than 70% over the past year as the broader market decline caused Bitcoin to trade at an all-time low.
MicroStrategy is one of the largest Bitcoin holders, with the company purchasing 2,395 BTC between November 1 and December 21, bringing its total holdings to 132,500 BTC.
According to Group One's website, the company is one of the largest private options trading firms in the U.S. It added that it maintains a physical presence at the CBOE, NYSE American Express, Arca and Nasdaq PHLX.
