There is a 'coincidence of' interests between the companies. [=the companies share the same interests]
It was mere/pure/sheer 'coincidence' that brought them together so far from Chicago.
It was no 'coincidence' that he quit his job at the bank a day after the robbery.
(..) Hey, how's it going? MIKE : Things are looking up. Coach Murphy practically put me on the team. That's not a coincidence. We're on the path. That's great. That's super you're finding your destiny and, blah, blah, whatever. Here's something. I need you to do something for me. (..)2009 17 Again
(..) - Oh, yeah. Look who you're talking to. I'm the guy who invented the software that prevents people from stealing music. I also invented the software that helps people steal music... ...but that's a happy coincidence. MIKE: What is that? Oh, my G... - Wrong. These are for me. - You kidding? (..)2009 17 Again