Hope this helps
//////////////////////
Listing Requirements
The OTCBB is not an issuer listing service, market or exchange. Although the OTCBB does not have any listing requirements per se, to be eligible for quotation on the OTCBB, issuers must remain current in their filings with the SEC or applicable regulatory authority. Market Makers will not be permitted to begin quotation of a security whose issuer does not meet this filing requirement. Securities already quoted on the OTCBB that become delinquent in their required filings will be removed following a 30 or 60 day grace period if they do not make their required filing during that time. A fifth character of "E" in a security's trading symbol is used to denote securities that FINRA believes are delinquent in their required filings; securities so denoted will be removed from the OTCBB after the applicable grace period expires. Note that an issuer can request review of the decision to remove the issuer’s securities by an independent hearings panel. Additional information regarding that process can be found in our FAQs. To provide evidence of compliance with the filing requirement, contact the OTCBB Issuer Filings Department. For more information regarding the eligibility requirements for the OTCBB, refer to Rule 6530.
