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All OTC Equity/Other OTC issue symbols are either four or five letters long. A fifth letter means the issue is something other than an issue of common or capital stock.
Listed below are the fifth letter identifiers and a description of what each represents:

CharacterDescription
AClass A
BClass B
DNew
EDelinquent in required SEC filings
FForeign issues, except ADRs
G,H, & IAdditional warrants or preferreds
JVoting
KNonvoting
LMiscellaneous situations, such as stubs, depositary receipts, second units, or additional warrants or preferred
MFourth preferred, same issuer
NThird preferred, same issuer
OSecond preferred, same issuer
PFirst preferred issue
QBankruptcy - involved in bankruptcy proceedings
RRights
SShares of beneficial interest
UUnits
VWhen-issued and when-distributed
WWarrants
YADR (American Depositary Receipts)
ZMiscellaneous situations, such as stubs, depositary receipts, limited partnership units, or additional warrants or units