Who are the most underground high-end companies


When I say underground I am talking about companies that fly below the radar. Not much talk about them on audio forums, little if no reviews, no formal advertising, rarely see their gear at shows.

taters
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When searching gear often the name Sugden comes up . Typically from posts from people in Europe . Audio Analogue as well 
Continuum Audio Labs (Caliburn turntable, $100K)
DarTZeel (you know, the guys with the $112k amplifier)
David Berning Company
BWS Consulting
TG Audio
Raidho
Lessloss
Acoustic Revive
Furutech

You don’t want to go that far underground most likely. Things heat up fast.

I've heard Goto.  Would go there if I could afford it.