A ticker symbol suffixed with additional letters identify that there are additional circumstances with the stock beyond a normal stock issue. The TSX and NYSE listings have the appended suffix extension "behind-the-dot". Nasdaq and OTC Markets have the appended suffix extension as a fifth letter.
TSX and TSXV
TSX "behind the dot" extensions and other special code
A-B – class of shares
NO, NS, NT – notes
S – special U.S. terms
DB – debenture
P – Capital Pool Company
U, V – U.S. funds
E – equity dividend
PR – preferred
UN – units
H – NEX market
R – subscription receipts
W – when issued
IR – installment receipts
RT – rights
WT – warrants
NASDAQ, NYSE, OTC Markets
A – Class "A"
K – Nonvoting (common)
U – Units
B – Class "B"
L – Miscellaneous (situations such as foreign preferred, preferred when-issued, a second class of units, a third class of warrants, or a sixth class of preferred stock).
V – Pending issue and distribution - when issued and when distributed (shares that are set to split or have another similar pending corporate actions).
C – Issuer Qualification Exception – (This is temporarily used to denote that the company is not meeting all listing requirements, but can remain on the exchange for the time being).
M – fourth class – preferred shares
W – Warrants
D – New issue or reverse split - This is temporarily used to denote a stock split or corporate reorganization.
N – third class – preferred shares
X – Mutual fund
E – Delinquent SEC filings - This is temporarily used to denote delinquent regulatory filings.
O – second class – preferred shares
Y – American Depository Receipt (ADR - Foreign Company)
F – Foreign issue
P – first class preferred shares
Z – Miscellaneous (situations such as a second class of warrants, a fifth class of preferred stock, a stub, a foreign preferred when-issued, or any unit, receipt, or certificate representing a limited partnership interest).
G – first convertible bond
Q – In bankruptcy
H – second convertible bond
R – Rights
PK – A Pink Sheet, indicating over-the-counter
I – third convertible bond
S – Shares of beneficial interest
SC – Nasdaq Small Cap
J – Voting share – This is temporarily used to denote a shareholder vote situation.
T – With warrants or rights
NM – Nasdaq National Market