Bitcoin Mining Giant Mara Completes $950M Deal to Buy More BTC

The world’s largest publicly-traded bitcoin miner is also the world’s second-largest bitcoin holder among publicly listed companies.

Mara Secures $950M Funding to Expand Bitcoin Holdings

Bitcoin mining firm Mara Holdings (Nasdaq: MARA) has raised $950 million by issuing interest-free senior convertible notes to private qualified investors, according to a Monday press release. The funds will be used to purchase “additional bitcoin and for general corporate purposes.”

Mara (formerly Marathon Digital Holdings) tips the scales at $5.98 billion in market capitalization, making it the world’s largest bitcoin ( $BTC) mining firm. The company is also the second largest bitcoin holder among publicly listed entities, boasting a stash of 50,000 $BTC at the time of writing. Mara is only second to Strategy, which currently holds a dizzying 607,770 $BTC, more than twelve times Mara’s bitcoin balance.

(Mara holdings is the largest bitcoin mining firm in the world by market capitalization / companiesmarketcap.com)

But now, armed with almost a billion dollars in capital, the largest bitcoin miner may be seeking to close in on the lead Strategy has created. Its sizeable $BTC holdings have even sparked speculation that Mara has morphed into a bitcoin “shadow bank” that augments its returns by lending out the cryptocurrency for a fee.

“MARA is building a shadow bank powered by bitcoin,” said one X user quoted in a July 18 article on Bitcoin.com. “In Q1 2025, they had ~47,531 $BTC on the balance sheet. Instead of selling into the market, they lent out ~14,269 $BTC to institutions.”

Mara is not a financial institution, but it’s possible that, like other companies such as Metaplanet, the mining giant may end up making a full pivot to a bitcoin treasury strategy.

“The net proceeds from the sale of the notes were approximately $940.5 million,” the release states, before listing several expenses the firm will have to pay after the fundraising effort. “Mara expects to use the remainder of the net proceeds to acquire additional bitcoin and for general corporate purposes.”