Salvatore
Crest: a spider within the Bauhaus cogwheel
Guard Order: Order of the Spider (hazardous environment troops)
House Salvatore is heavily involved in industrial chemical production and pharmaceuticals. Most of its chemicals are produced through Salchem Industries, but it's a little known fact that it also owns Warberg Technochem, infamous for its production of poison gases.
Its pharmaceuticals are produced through several subsidiaries, such as Tekmed and Healthstar, but it also owns Straker Biotech, which is infamous for its position at the forefront of genetic engineering and bio-technological research - an area most certainly frowned upon by the Brotherhood and heavily regulated by the Cartel. Perhaps not surprisingly, House Salvatore has many dealings with Cybertronic.
Before the time of the Edicts of Toth, House Salvatore engaged in genetic engineering to the point of constructing hybrids of human DNA crossed with that of the Venusian Devilcat Rex (an odd creature that appeared as some sort of side effect of the terraforming efforts on Venus, its artificial origins lost to history). It is also rumored that they performed similar experiments with laboratory rats, and possibly other creatures as well, and is largely to thank for Capitol's successes in experimentation in this area, which produced the Dog-Men.
Although many of these hybrid creations were unique, or were produced in such small numbers that they eventually died out, there are still a few descendants of some of these earlier creations to be found in human society -- and some of them are even considered members of the various Houses (thanks to testing to discover just whose genetic material was being used to produce these hybrids). It's a badly kept secret that House Salvatore has done quite a bit of experimentation on its own family members, and most members of House Salvatore are especially resistant to toxins and diseases. Purportedly, Straker Biotech's research does not extend into further manipulation of human DNA, but at the very least, their technological assistance is bound to be used for such purposes by Cybertronic, which has no need to appease the Brotherhood.
Sternberg
Crest: open book on the Bauhaus cogwheel
House Sternberg is an ancient house withering on the vine. It has produced many brilliant scientists, talented poets and writers, and philosophers, but fewer and fewer children are born to the family each generation.
Valmonte
Crest: rearing silver horse within the Bauhaus cogwheel
Guard Order: Order of the Stallion
This is one of the more infamous Noble Houses, and better known in seedier parts of the solar system than the more powerful (and respectable) Bauhaus nobility. This is primarily because House Valmonte is the owner of the disreputable Stud Pictures, which produces "tasteful adult entertainment" for "mature audiences", and many of the stars are drawn from the core family. The family in general is known for publicly lewd and disreputable behavior, and has been wracked by all manners of scandal and disasters, like a living soap opera. Many members have been discharged from the Bauhaus military because of dishonorable conduct. The only reason that the house is even tolerated is because the Order of the Stallion has actually managed to produce a number of highly-decorated war heroes (and heroines) - but it's still highly probable that this family has ties with criminal organizations, given the known habits of many of its members.