- OTCQX (its top tier);
- OTCQB (its middle tier); and
- OTCPink (its bottom tier).
The representative of OTC Market seemed to attribute much of their success to the fact that their OTC Link platform is electronic while the OTCBB platform is telephonic, thereby making the OTC Link system more user-friendly. I don't know if the OTC Link system is truly more user-friendly (I invite any readers who are registered broker-dealers to comment on that issue), but I would note that the OTCBB requires its companies to be current in its SEC reporting obligations under the 1934 Act, while the OTC Market has no such requirement. The OTCBB loses companies on the top end that "graduate" to become exchange-listed companies and those on the bottom end who choose to "go dark" and cease their SEC reporting obligations. OTCQX companies need not be SEC-reporting, but the OTCQX does have requirements regarding asset size ($2 million), revenues ($2 million), minimum share price ($0.10), etc., while the OTCBB does not.
As of today, there are 330 securities quoted on the OTCQX and 2,355 securities quoted on the OTCBB.