Adjective that means under constant / frequent change
I think what you are basically looking for is a word that means both these things: One, that the leaderboard is changing, and two, that it's changing for the better (because the firms are ramping up operations).
Keeping this in mind, I suggest that you go with progressive
Progressive:
of, relating to, or characterized by progress
making use of or interested in new ideas, findings, or opportunities
[Merriam-Webster Dictionary]