A ------ NYSE AMEX
B ------ NASDAQ OMX BX
C ------ National Stock Exchange
D ------ FINRA
E ------ Consolidated Quotation System
I ------- International Securities Exchange
J ------ Direct Edge A
K ------ Direct Edge X
M ----- Chicago Stock Exchange
N ------ New York Stock Exchange
P ------ NYSE Arca SM
T ------ NASDAQ OMX
W ----- CBOE Stock Exchange
X ------ NASDAQ OMX PSX
Y ----- BATS Y-Exchange, Inc.
Z ----- BATS Exchange, Inc