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Non-Tech : Quote.com QCharts
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To: jebj who wrote (4454)11/21/1999 1:35:00 PM
From: Matthew L. Jones  Read Replies (2) of 17977
 
JB,

Just taking a stab and maybe Gibbons will have time to jump in...
The quote vendor that I work on the development team for (and my broker's PC Quote feed as well) uses different servers for Level 2 and for charting as for the regular L1 quotes. I would bet that S&P Comstock is the same. Also, the level 1 quote is the "official" published quote. I've noticed with all three of my quote services that on Nasdaq stocks, the bid and ask all move to the "true" market in pre and post market sessions, however, the "last" field does not update (from the "official" day session close). Time and sales will reflect accurate "last" in pre and post market sessions and all will have accurate bid and ask. I think that the "last" stays fixed after the day session because the next day's change is computed from that number (as opposed to change from the open of the next day session). Have you looked at bid and ask to determine the current market for the stock outside of the day sessions or do you look at "last". I hope this makes sense. I just know that all three of my quote vendors all do the same thing there. Makes me think it is a standardized thing. The "last" field is supposed to be "last" of the day session until the new day session opens (even though time and sales shows that prices change in the aftermarket).

Matt
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