Self-described Bitcoin development company MicroStrategy (MSTR) didn't add to its bitcoin {{BTC}} holdings since mid-September, but the firm announced an audacious plan to raise $42 billion of capital over the next three years in order to purchase more of the world's largest crypto.

Led by Executive Chairman Michael Saylor, the company's so-called "21/21 Plan" calls for $21 billion of equity raises and $21 billion of debt offerings over the next three years.

"As a Bitcoin Treasury Company, we plan to use the additional capital to buy more bitcoin as a treasury reserve asset in a manner that will allow us to achieve higher BTC Yield,” said Phong Le, president and CEO in the third quarter earnings press release.

MicroStrategy's most recent previous disclosure was in mid-September when it announced the purchase of 7,420 bitcoins {{BTC}} for $458.2 million. That brought its holdings to that point to 252,220 bitcoins acquired for a total of $9.9 billion, or an average price of $39,266 each. At the current price of about $72,000 the company's bitcoin is worth more than $18 billion.

As of the end of the quarter, the company had $891.3 million of dry powder remaining from a previous capital raise.

MicroStrategy also revised higher the target range of its "BTC Yield" to 6%-10% from the previous 4%-8%. Created by the Saylor and team, the BTC Yield is considered by MSTR to be a key performance indicator (KPI), describing how well the company does in acquiring bitcoin in an accretive manner to shareholders. The BTC Yield for Q3 was 17.8%.

Shares are lower by 10% in after hours trade, but remain roughly 250% higher year-to-date.