Bitcoin miner MARA Holdings ( MARA ) shares jumped nearly 4% in post-market trading after the company posted record revenue for its second quarter, beating Wall Street's expectations.

MARA reported revenue of $238.5 million, a 64% rise from $145.1 million in the same quarter a year ago, according to an earnings presentation. The mining firm said the increase was primarily due to a 50% rise in the average bitcoin price during the quarter. MARA's revenue also beat the average analyst estimate of $227.9 million, according to the FactSet data.

The company mined 2,358 bitcoin in the quarter, a 3% increase from the previous quarter. Energized hashrate or mining machines that are currently online rose by 6% to 57.4 EH/s. MARA is aiming to reach 75 EH/s by the end of this year.

The miner, which started buying bitcoin in the open market, currently has nearly 50,000 BTC on its balance sheet, making it the second-largest publicly traded company, after Strategy (MSTR), to hold bitcoin in its treasury. At the current spot price of $117,618, the holdings would be worth almost $6 billion.

However, unlike many other bitcoin treasury companies, the firm said that it doesn't just hold BTC on its balance sheet; rather, it actively manages them. It has about 31% or 15,550 bitcoin loaned, actively managed or pledged as collateral as part of its treasury management.

"We are more than a bitcoin treasury company," MARA said in the letter. "And because we are operators, not just holders, we view bitcoin as a productive asset. We actively deploy portions of our holdings to enhance returns and strengthen our long-term capital position," it added.