Hiya PTL! I can help answer about OTCQX, OTCQB, OTC Pink, etc.
OTCQX: The OTCQX tier includes both multinational companies seeking access to U.S. investors and domestic growth companies.To be traded on this tier, companies undergo a review by OTC Markets Group. Companies are not required to be registered with or reporting to the SEC, but must post financial information with OTC Markets Group. In addition, US companies must be ongoing operations (no shells, etc.) and may not be in bankruptcy, while foreign issuers must meet the requirements of qualified Non-US exchanges. Additional oversight of OTCQX securities is provided by requiring every issuer to be sponsored by approved third-party investment banks or law firms.
OTCQB: OTCQB companies must be registered with and reporting to the SEC or a U.S. regulatory agency. There are no financial or qualitative standards to be in this tier.
OTC Pink: An open marketplace that has no financial standards or reporting requirements. The stock of companies in the OTC Pink tier are not required to be registered with the SEC. Companies in this category are further categorized by the level and timeliness of information they provide to investors and may have current, limited, or no public disclosure.
OTC Pink Current Information: Companies that have submitted information no older than six months to the OTC Markets data and news service or have made a filing on the SEC's EDGAR system in the previous six months are rated as having current information. This category includes shell companies or development-stage companies with little or no operations, as well as companies without audited financial statements.
OTC Pink Limited Information: Companies that are unwilling or unable to meet OTC Markets' Guidelines for Providing Adequate Current Information, but have submitted some but not all of current information required, are rated as having limited information. These are often companies with financial reporting problems, economic distress, or in bankruptcy.
OTC Pink No Information: This tier indicates companies that are unwilling or unable to provide disclosure to the public markets. Companies in this category do not make current information available via OTC Markets disclosure and news service, or if they do, the available information is older than six months. This category includes defunct companies that have ceased operations, as well as 'dark' companies with questionable management and market disclosure practices. Securities of publicly traded companies that are not willing to provide information to investors are considered highly risky.
Caveat emptor - buyer beware: There is a public interest concern associated with the company. This may include a spam campaign, stock promotion, or known investigation of fraudulent activity committed by the company or insiders. During a spam campaign, any stock that is not in the Current Information category will also have its quotes blocked on otcmarkets.com.
OTCBB: The OTC Bulletin Board is a listing of securities that are also traded "over the counter" similar to the OTC Markets. OTCBB companies are required to file timely reports to a US regulatory agency.