Trying to figure it out

[Mild_Mannered_Jeff]

On a Level 2 screen the top 5 Market Makers for TSO (Tesoro Corp)are as follows:
NSDQ
TMBR
UBSS
BARD
SUSQ
Does NSDQ stand for NASDAQ..........If so, how does that relate to the other Market Makers

Sorry to be so dumb

Thanks in Advance