Somnis Health Enterprises

While not holding a monopoly over medical R&D, Somnis Health Enterprises is at least one of the largest and most successful R&D centers out there, bar Aves International. They are responsible for the most research done on robotic limbs, altered genetics, and modifications. They also sell them and provide the respective surgeries. Recently, they've gotten a bit of a bad name for a few under-the-table deals. Despite this, they're still quite popular, both on Earth and on colonies.