What Does XD Mean on a Stock Quote?
XD on a stock quote means ex-dividend. Decode XD, CD, XR, XW and WI, see where each marker comes from, how long it lasts, and why it is not the ticker.
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Professional vs Non-Professional Market Data
Professional vs non-professional market data status decides your exchange fees. The occupational tests, self-certification, audits, and why OPRA differs.
Why Stock Quotes Are Delayed 15 Minutes
Why are stock quotes delayed 15 minutes? How exchange data licensing sets the rule, and what a quarter hour of staleness actually costs on real prices.
How Big Is the OPRA Options Quote Feed?
How big is the options quote feed? We count one full day of OPRA-scale NBBO updates in our warehouse and measure it against the entire stock quote tape.
What Is the NBBO? National Best Bid and Offer
The NBBO is the national best bid and offer, the one consolidated stock quote your broker must match or beat. See how fast it updates, from real tick data.
Locked and Crossed Markets, Explained With Data
A locked market quotes the bid equal to the ask; a crossed market quotes the bid above it. See why Reg NMS bans both and how often each hits the tape.
What Is a Bid-Ask Spread? Real Costs
Learn what a bid-ask spread is, how to calculate it, and what it costs per trade, with real spreads measured from tick-level quote data on US stocks.