According to Odaily, JPMorgan has revised its ratings for several Bitcoin mining companies. The financial institution upgraded the rating of Bitcoin mining firm IREN from 'neutral' to 'overweight.' Conversely, Cipher Mining's rating was downgraded from 'overweight' to 'neutral.' Additionally, JPMorgan maintained an 'overweight' rating for Riot Platforms and CleanSpark, while MARA Holdings received a 'neutral' rating.