Shares of MicroStrategy were down over 4% as markets opened on Monday after the Michael Saylor-owned software enterprise announced its weekly Bitcoin buy, this time of over 5,000 BTC for around $561 million.

MicroStrategy (MSTR), the software developer that has made acquiring bitcoin (BTC) a core value, added to its holding for a seventh week in a row. The company bought 5,262 BTC for a total of $561 million in the week ended Dec. 22 to take its total holdings to 444,262 BTC it said.

MicroStrategy joins the Nasdaq 100, reflecting its Bitcoin-driven strategy, while Sol Strategies enters the CSE 25 index after a 2,195% stock surge.

MicroStrategy (MSTR) will be included in the Nasdaq 100 stock market index, beginning one of the ultimate vampire attacks on the stock market.

MicroStrategy buys 5,262 BTC and joins Nasdaq-100, boosting its stock and Bitcoin holdings to over 444,000 BTC, valued at $42.7B.

MicroStrategy has acquired an additional 5,262 BTC, bringing its total holdings to over 158,000 BTC, reaffirming its status as the largest institutional Bitcoin holder. The purchase, worth $147.3 million at current market rates,

MicroStrategy shares briefly surged on Monday before faltering to end nearly unchanged, after the software company and bitcoin stockpiler was selected to join the tech-heavy Nasdaq 100 index, further brightening the prospects of the stock.

MicroStrategy's business acumen is worth something, so the stock deserves to sell at a premium to the company’s bitcoin holdings

After a massive rally over the past quarter, shares of MicroStrategy Inc. (NASDAQ: MSTR) started to face some controversy regarding the underlying business model and methods of this technology stock accumulating Bitcoin on their balance sheet through shareholder dilution.