NASDAQ Information Array - nasdin
The NASDAQ Information Array contains a history of an issue's trading status on The NASDAQ Stock Market. Each set of information, or structure, contains status and classification fields and the effective date ranges of those fields. If the NASDAQ Traits Code, NASDAQ National Market Indicator, NASD Index Code, or Market Makers Count changes, then a new structure is added, and the date of the change is recorded in the NASDAQ Traits Date. Each issue traded on the NASDAQ Stock Market since November 1982 has at least one NASDAQ Information Array.
NASDAQ Information Array Data
NASDAQ Information Date Range
NASDAQ information structures are available for securities trading on NASDAQ beginning on April 1, 1982 for NASDAQ Traits Date and NASDAQ National Market Indicator. All fields are available beginning November 1, 1982. 1
The NASDAQ National Market was initiated in April 1982 for larger and generally more actively traded NASDAQ securities. The NASDAQ National Market Securities must meet higher financial and non-financial criteria than other NASDAQ stocks, and were always subject to last-sale reporting. In June of 1992 the regular NASDAQ segment of
The NASDAQ Stock Market was renamed The NASDAQ SmallCap Market and for the first time these issues became subject to real-time price and volume reporting.
1 NASDAQ information data are missing in December, 1982 for all issues with NASD company numbers less than 1025 (approximately 20 percent of the securities active at that time), and are missing in February, 1986 for all issues. NASDAQ Traits Date, NASDAQ Traits Code, and NASDAQ National Market Indicator are complete. All other fields are missing.