Who Knew about Bilbo’s Ring?

[Alcuin]

I count 17 people, 14 of whom survived the Battle of Five Armies or were not in it.

• Gollum. Obviously
• Thorin & Co. Everyone but Thorin found out during the battle with the spiders. Thorin found out while imprisoned in the Elvenking’s halls. Thorin, KÃ*li, and FÃ*li died, leaving 10 Dwarves who knew Bilbo had a ring that made him invisible.
• Gandalf. He couldn’t learn about the Ring until he reached Dale, but Bilbo thought he suspected something as soon as he rejoined Thorin & Co.

  “Mr. Baggins has more about him than you guess.� [Gandalf] gave Bilbo a queer look from under his bushy eyebrows, as he said this, and the hobbit wondered if he guessed at the part of his tale that he had left out.

• Dain Ironfoot. There is no certainty here, but he probably learned about it from the survivors of Thorin & Co.; if not immediately, surely they had sense enough to tell him when the messenger from Mordor arrived. (I assume the messenger was a Ringwraith.)
• The Elvenking. Again, there is nothing certain here, but he implies that not only does he know Bilbo has a ring that makes him invisible, but he also knows that it casts a faint shadow in sunlight:

  May your shadow never grow less (or stealing would be too easy)!

Is there anyone else?