Defunct brands-

@flyr + 1 - KLH has been continuing to make speakers for years, and just recently brought out a larger version of the Model 5's which I had a few years ago, with larger Model 7's.  

Thiel speakers come to mind - I still listen to 3.6's and CS6.  I think Kara retired not sure if dehavilland electric is still in business.  Love the ultra verve preamp.

EPI speakers.

Acoustat Spectra 1100 ESL, Placette line stage.

Paracas out of Carson City, NV.   Carl A. Staub was the owner and designer.   His amps were amazing, and he was a really fun ethical guy.   I have no idea what happened to him as I’ve lost touch.   His amps competed with Krell and Threshold back around 1980.   They had so much energy storage that I could unplug them from the wall and the amps would continue to play at volume for about 30 seconds.   I was lucky enough to own serial numbers 1A and 1b.

XStatic out of Oakland, CA.   Jason Daniels is still around and experimenting with new speaker designs and repairing his XStatic electrostats.   Great speakers and another great guy.  I still have my XStatic EC/1 speakers.