What’s a 10k to 15k speaker from smaller company that performs well?

Kharma, Lansche both used. Not sure how small they are, though.

Well, not sure about "smaller" but I'm a big fan of Monitor Audio and some (not all) magico in that price range.

I really am a big fan of Fritz in terms of a nearly one person shop. Top end parts in very reasonable priced configurations.

Legacy Aeris (used) with Wavelet or Focus SE or XD (semi-active uses Wavelet) are worthy contenders and are at a whole different level of play compared to Signature SE.

Agree with others who have named Joseph Audio, Daedalus and Rosso Fiorentino (Siena is an amazing speaker and worth the stretch). Eggleston Works Andra III or Savoy SE (used at a bit higher price) are also extremely worthy of note....

Any loudspeaker from Thiel Audio.