As I understand it, Mullenweg has explicitly said in his video interview [0] that no other company is currently paying an 8% license fee. The WordPress Foundation trademark policy page [1] states (since Sep. 24) that its only commercial sublicensee is Newfold Digital, and Mullenweg mentioned this in the same interview, but I don't think that the sum that Newfold pays has been disclosed anywhere.

[0] https://youtu.be/H6F0PgMcKWM

[1] https://wordpressfoundation.org/trademark-policy/