The gray market imo another red flag, maybe not sufficient confidence to file a solid IPO .......... gray markets are not regulated and overall risky/questionable .......let's not compare with Facebook or Twitter.......we are in a different league of missed opportunities and poor business decisions.
Dawson James has raised impressive funds and continue to cover company progress............waiting for GNBT and or NGIO/NUGX. Maybe they will clarify current valuation.

https://dawsonjames.com/reports-landing/

https://dawsonjames.com/transactions/

GNBT 5M @ 0.392 .............

https://www.extraordinaryinvestor.com/grey-sheets.html