Bitcoin mining profitability fell by more than 7% in September, according to a report by Jefferies. This decline was attributed to a 2% drop in Bitcoin's price and a 9% increase in the network's hashrate. Publicly listed North American miners produced 3,401 BTC in September, a decrease from 3,576 BTC in August, with MARA Holdings leading production at 736 BTC. Revenue for a 1 EH/s mining fleet decreased to $52,000 per day in September, down from $56,000 in August. Despite the decline in profitability, Jefferies raised its price targets for Galaxy Digital and MARA Holdings, indicating potential confidence in their future performance.