Where can quotes for over-the-counter securities ineligible for listing on NASDQ be found?

Quotes for over-the-counter (OTC) securities that are ineligible for listing on the NASDAQ can be found in the Pink Sheets. This service provides market quotes, both bid and ask prices, for OTC stocks that do not qualify for a listing on major exchanges. The Pink Sheets primarily cater to stocks that might be considered too low in market capitalization or that do not meet other criteria for public trading on exchanges like NASDAQ or the NYSE.

The Pink Sheets are an essential resource for traders and investors looking for information on OTC securities, which can often be more illiquid and less transparent than listed stocks. The information provided by the Pink Sheets allows market participants to gauge the trading environment and potential investment opportunities within these less regulated securities.

In contrast, the other options—such as the National Market System and the Consolidated Tape—primarily focus on listing and trading activities of securities that are already registered on exchanges, while the Consolidated Quotation Service deals with quotes from listed securities rather than those traded OTC. Therefore, the most appropriate source for quotes of OTC securities not listed on NASDAQ is indeed the Pink Sheets.