I did a lot of research regarding NRG.

And their volume @ DigiFinex seems to be mainly fake.

There are several articles that proof trade washing at DigiFinex.

Largely bots are manipulating the volume and influencing the price.

This document is interesting
https://www.sec.gov/comments/sr-nysearca-2019-01/srnysearca201901-5164833-183434.pdf