Let's say I (US citizen) form a US (Wyoming) C Corp and add a UK resident/citizen as an owner. As long as I keep their ownership under 25%, I don't have to file the 5472.
But what if they are married and I give them each 20%? Do I have to file 5472 because their combined ownership is over 25%, and they are married? Or is it based on individual ownership being under 25%?