ADR American Depository Receipt. Most likely: Non-Sponsored ADR vs Sponsored A non-sponsored ADR is created by brokers/dealers without the cooperation of the foreign company issuing the shares. Non-sponsored ADRs are traded in US over-the-counter markets without requiring registration with the Securities and Exchange Commission (SEC).
Before 2008, any brokers and dealers trading in ADRs were required to submit a written application before being allowed to trade in the US. The 2008 SEC amendment provided an exemption to foreign issuers that met certain regulatory conditions. Non-sponsored ADRs are only traded on over-the-counter markets.