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The securities listed on Nasdaq can be quoted and traded from any US exchange. Trades and quotes on these securities are distributed on two separate feeds, the UTP Quotation Data Feed (UQDF) and the UTP Trade Data Feed (UTDF). UQDF provides traders a direct view of an NBBO. These feeds are considered level 1 or the top-of-book.
Level 2 data displays the best bid and ask prices (also known as "top-of-book") for each market participant in a given security. In other words, at a given time there may be several market makers participating in trade matching for a specific stock. Level 2 data will display the highest bid and lowest ask for each individual market maker.
A significant gauge of the level of options market data is messages per second (MPS), which is the number of messages (i.e., options trade and quote data) reported to OPRA by the options exchanges during any given second of a trading day. Data volume has increased dramatically since the early 1990s, as illustrated in the following table. [2] [3 ...
Reference data includes identifier codes such as ISIN codes, the exchange a security trades on, end-of-day pricing, name and address of the issuing company, the terms of the security (such as dividends or interest rate and maturity on a bond), and the outstanding corporate actions (such as pending stock splits or proxy votes) related to the ...
Level 1 and Level 2 declines result in a 15-minute trading halt unless they occur after 3:25 pm, when no trading halts apply. A Level 3 decline results in trading being suspended for the remainder of the day. [49] (The biggest one-day decline in the S&P 500 since 1987 was the 11.98% drop on March 16, 2020.)
Furthermore, (unlike in the literature example), the third-level nested quote must be escaped in order not to conflict with either the first- or second-level quote delimiters. This is true regardless of alternating-symbol encapsulation. Every level after the third level must be recursively escaped for all the levels of quotes in which it is ...