Stradivarius 
Independent Italian label devoted to presenting new and alternative classic music.
http://www.stradivarius.it/Sonora Productions 
Specializes in Classical and Sacred music.
http://www.sonoraproductions.com/index.html
Stieglitz 
(Classical Label of Pink Tontraeger) Rarities; online shopping. [German/English]
http://www.stieglitz-klassik-musik-label.de
Symposium Records 
Re-issues recordings from the late 19th and early 20th centuries.
http://www.symposiumrecords.co.uk
Somm Recordings 
Choral and instrumental music. Recordings of British conductor Sir Thomas Beecham. Online catalogue with MP3 samples.
http://www.somm-recordings.demon.co.uk
Sherman Records 
Audio and video content licensing including Libretto Classics series.
http://www.shermanrecords.com/
Selene 
Polish label, with a focus on Polish composers and performers.
http://members.aol.com/seleneusa/
Sotone 
Releases of French Horn performances.
http://www.sotone.com
Sound Dynamics Associates 
Recording and reissuing Classical music performances and recordings on CD.
http://sd-associates.com/
Sanctuary Classics 
Specializing in contemporary Classical music.
http://www.sanctuaryclassics.com/homepage.php?section=0&subsection=0&gotFlash6=true
Sony Classical 
Classical, crossover, and soundtrack music label. Features sound clips, tour schedules, and upcoming releases.
http://www.sonybmgmasterworks.com/
Supraphon 
A Czech company devoted to spread music of the genre by local artists. Features a catalogue composed by new recordings as well as digitally remastered re-editions of historic recordings.
http://www.supraphon.com/