How many people know Batman’s secret identity?

As revealed in Batman v Superman: Dawn of Justice, Lex Luthor knows who the Batman is. And so does Wonder Woman. Apparently, in the DCEU, Bruce Wayne isn’t actually too keen on keeping his hidden identity hidden. The Justice League teaser trailer saw him meeting Flash and Aquaman as the billionaire and not as the crime fighter.

But what is surprising is that Amanda Waller also knows who he is. And this is not explained in the movie. Just as it wasn’t explained how Lex knows about Bruce’s secret identity. And this is a bummer, especially since such a reveal would also build a character.

And this question (why do so many people know about this?) needs to be answered sometime in the future.