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.
(..) replaced by Santa's Little Helper. Bart, did you hear that? What a name! Santa's Little Helper! - It's a sign! It's an omen! - It's a coincidence, Dad. - What are the odds on Santa's Little Helper? - Ninety-nine to one. Wow! Ninety-nine times thirteen equals... Merry Christmas! I got a bad feeling (..)1989 TvShow: The Simpsons Title: Simpsons Roasting on an Open Fire Season: 1 Episode 1