The Securities and Exchange Commission form, filed on Sept. 4, notes a date of first sale of Aug. 24, more than a week before the announcement that Harmonix would launch a game on Fig's equity crowdfunding platform.
Polygon reached out to both Fig and Harmonix earlier this week and has yet to receive comment.
In May of last year Harmonix laid off 37 employees, and moved Alex Rigopulos, co-founder and at one time chief executive officer of the company, to his current position as chief creative officer. The partnership between Harmonix and Fig placed Rigopulos on Fig's advisory board.
Harmonix is currently developing at least three games, including the Kickstarter-funded Amplitude. Rock Band 4 will be co-published with peripheral manufacturer Mad Catz, which recently told investors that it needs Rock Band 4 to be a hit in order to ensure the continued financial stability of that company.
Harmonix is also working on Beat Sports, a new title being designed for Apple TV, which was publicly announced Sept. 9 at an Apple event.