first mover

noun2

1. •
   An early player in a market, such as the first company to commercialize a newly developed technology.
2. •
   The initial agent that is the cause of all things; the prime mover.

   • The chiefest God first moouer of that Spheare, Enchac’d with thousands euer shining lamps, Will sooner burne the glorious frame of Heauen, Then should it so conspire my ouerthrow. — 1587