Board Thread:Questions and Answers/@comment-5164970-20160601172157/@comment-1894786-20160601204607

Iron Man, Vision and War Machine. They're the only ones who signed the accords to begin with.

Natasha signed them, too. But she betrayed the Avengers by helping Cap and Bucky. And it's implied that by the end of the movie, she's gone underground like the entirety of Cap's team.

Spider-Man was only in the final battle, Black Panther signed nothing, and all of Team Cap is underground, and presumably in Wakanda with Bucky.