Near the beginning of the rathtar scene in The Force Awakens, there are several guards or companions in the background. They never say anything that I can recall. Do we know who/what these are?
They are the foot soldiers of the Guavian Death Gang based on the canon source Star Wars Databank.
Known for its distinctive red-armored foot soldiers, the Guavian Death Gang is a criminal organization driven out of the Core Worlds by unrest in the galactic underworld. Guavian Death Gang soldiers undergo cybernetic augmentation, with a mechanical reservoir and pump injecting chemicals into their bloodstreams to enhance speed and aggression. They are silent in battle, communicating via high-frequency datastreams. Han Solo ran afoul of the Guavians for failing to repay their 50,000-credit loan.
According to the film's Visual Dictionary, these individuals are "Security Soldiers", loyal to the Guavian Death Gang.
Interestingly, the licensed toy refers to them as "Guavian Enforcers"