The NASDAQ Stock Market, Inc.
Symbols for NASDAQ stocks are always 4-5 letters. The fifth letter is never an 'X', to avoid naming conflicts with Mutual and Money Market Funds. Instead, the fifth letter may be one of these letters:
A Class A
B Class B
C Exempt from NASDAQ listing qualifications for a limited period
D New issue of an existing stock
E Delinquent in required filings with SEC
F Foreign
G First convertible bond
H Second convertible bond, same company
I Third convertible bond, same company
J Voting
K Non-voting
L Miscellaneous situations, including second class units, third class of warrants, or sixth class of preferred stock
M Fourth preferred, same company
N Third preferred, same company
O Second preferred, same company
P First preferred, same company
Q In bankruptcy proceedings
R Rights
S Shares of beneficial interest
T With warrants or rights
U Units
V When issued and when distributed
W Warrants
Y American Depositary Receipt (ADR)
Z Miscellaneous situations, including second class of warrants, fifth class of preferred stock and any unit, receipt or certificate representing a limited partnership interest
NASDAQ Bulletin Board
Symbols for NASDAQ Bulletin Board stocks are always 4-5 letters. You must use the exchange abbreviation BB: before the symbols itself.