To be honest it depends on what research you are reading at the time. Even though these gangs are styling themselves on real world businesses, they are criminals and so do keep some thing secret.
It does not matter ransomware is a major risk to any organisation.
The main thing we should remember is, whether it is this gang or that gang, whether you are the deliberate target or just collateral damage – your cyber security defences should be as good as you can make them.
Conti leaks data stolen during January attack on Oregon county – The Record by Recorded Future
Is REvil having a resurgence, or is there a copycat hacking group? | TechRepublic
And it is not always ransware – there is the DDoS attack as well:
Time to play everyone’s favorite game: REvil? Or Not REvil? • The Register
Further Reading
Ransomware attack have increased again – Smart Thinking Solutions
Universities as targets UPDATED 23 May 2022 – Smart Thinking Solutions
Is the Conti gang really gone? – Smart Thinking Solutions
BlackByte cyber gang active despite the FBI advisory – Smart Thinking Solutions