Competition in the Bitcoin mining sector intensified in September 2025 as mining difficulties reached new all-time highs and production for most major miners decreased.
In this environment, large companies with strong balance sheets and accumulation strategies continued to thrive, while small-scale miners faced increasing pressures from operating costs and technological volatility.
Bitcoin production decreases as difficulty increases
According to published reports compiled by Beincrypto, Cango mined approximately 616 BTC in September, down from 663 BTC in August.
CleanSpark produced 629 BTC. This was a slight dip from the previous month. The Riot platform generated 445 BTC compared to 477 BTC in August. Bitfufu output dropped sharply to 329 BTC, while Marathon Digital Holdings (Mara) maintained the lead with 736 BTC mined, further expanding its Bitcoin reserve.
Bitcoin production by major mining companies. Source: Beincrypto
The data suggests that while large miners have been able to keep production relatively stable, smaller operators have begun to feel the strain from hardship and rising energy costs.
BTC holdings of selected companies. Source: Beincrypto
Meanwhile, Bitcoin’s network difficulty rose to 142.34T in September, an all-time high. This consistent increase in difficulty means that each unit of hashrate becomes less BTC, resulting in a lower hash price (revenue per unit of computing power).
As a result, miners’ profit margins continue to be pushed up, especially for those with higher energy costs or less efficient hardware.
The difficulty of Bitcoin mining. Source: BlockChain.com
In particular, New York’s new anti-Bitcoin mining bill recently proposed progressive taxes on Bitcoin mining companies, redirected to lower utility bills for residents. The bill faces an uncertain outlook but could disrupt multibillion-dollar data center plans and increase state cryptocurrency regulation.
In summary, Bitcoin production in September revealed that technological pressure is being supplied to the mining industry. As difficulty continues to rise and profit margins shrink, large miners like Mara with efficient infrastructure and strategies for BTC accumulation will remain in a strong position.
Smaller companies will need to carefully consider selling BTC, reducing power capacity, or scaling operations to navigate the competitive landscape.
Post-Bitcoin production in September softens amid increasing difficulties. Mara appeared first on Beincrypto.
