You can type in the symbol of a QB and it will denote is as such. I tried MDBX, it's a QB.
There actually is in fact a lower tier called the "grey sheets". Not sure who manages that. But, LQMT probably don't wanna go there if they ever intend to dilute to raise funds again.
As always just my opinion and please double check and let me know if my information is incorrect.
I'm on my cell phone so maybe I'm missing something but everywhere I look Liquidmetal is still listed on the OTB. If they were downgraded to the pink sheets I could put a positive spin on that, but I won't. Some things are best unsaid so I don't have to listen to the negative feedback. Make it a great weekend my friend!