Activist HF

Hi guys, 

I am curious about activist HFs such as TCI or Pershing Square. 
I have listened the latest podcast of Sir Chris Hohn where he declared that TCI strategy changed, now they are more focused on quality of the companies rather than activism. Do you have any further information about that? Is it common that those kind of HFs manage both activist positions and others where they are not activist? I’m considering both TCI in the past and other funds such as Pershing Square, Third point, Cevian, etc...

Thanks! Have a good Saturday!