MicroStrategy shares fell more than 3% Tuesday after the enterprise software company announced it would buy more bitcoin.

In a press release, MicroStrategy said it plans to offer senior convertible bonds worth $ 600 million and use the net proceeds to purchase Bitcoin.

After the announcement, the share price in premarket trading rose more than 5%.

At the time of filing on February 2, the company already owns nearly 72,000 Bitcoin units. That’s worth nearly $ 3.6 billion based on the price of the virtual currency on Tuesday.

It is the second time that MicroStrategy has raised funds to finance a purchase of the cryptocurrency. In December, the Virginia-based company closed a senior convertible bond offering for $ 650 million.

Convertible bonds are debt securities that can later be converted into shares, cash, or a combination of both.

Under the leadership of Chairman and CEO Michael Saylor, MicroStrategy became an early adopter of companies buying Bitcoin as an investment. The company announced its first purchase of the cryptocurrency in August, acquiring 21,454 bitcoins with cash on its balance sheet.

Saylor is pleading for other companies to do the same and is hosting a virtual conference earlier this month called Bitcoin for Corporations. Saylor publicly encouraged Elon Musk, CEO of Tesla, to follow his “game book” in a Twitter conversation in December. Just over a month later, Tesla announced it had bought $ 1.5 billion worth of Bitcoin and had plans to eventually accept the digital coin as a means of payment for its products.

Bitcoin price hit $ 50,000 per coin for the first time on Tuesday morning, but then fell. In the past few days, several established financial firms like BNY Mellon and Mastercard have announced moves in the crypto space.

MicroStrategy stock has been in turmoil since August as some investors viewed the stock as a way to get exposure to Bitcoin. Since August 11, the date the company announced its first Bitcoin purchase, the share price has been over 660%.

The stock hit a 52-week high of $ 1,315 on February 9.