I am beginning to use thinkorswim as a broker and have just discovered they offer level II quotes. But when I looked at the quotes, it doesnt show any market makers like I thought level II quotes did like goldman sachs, bear sterns, lehman brothers, etc. The quotes seem to just show exchanges such as cboe, nyse, and nasdaq. Can anybody tell me why this is? Also can someone tell me what CHXE and CINN stand for?