Yes, Tor have published what I'd qualify as outright horror. Kidding aside, they printed Alan Nayes' 'The Unnatural' in 2003, which was horror in the same vein as Silence of the Lambs was. Did you know that they publish Datlow's solo anthologies, as well? And they seem to be the publishers for Brian Lumley's Necroscope series, which is in print through them.
And then for true horror's sake: these fuckers print Orson Scott Card.