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PX_BID and PX_ASK are the static equivalents of BID and ASK, the latter two of which populate in "real time" (i.e. as they are dynamically updated). So the PX_BID and PX_ASK values are dependent upon when you pulled the data. Bloomberg's source depends on the asset in question and the exchange on which they are listed, but the data does come from the ...


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I don't know about free of charge, but if you're subscribed to WRDS or similar data sources, then here's how to get the historical S&P 500 constituents data


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They represent the current BID and ASK at the time you query them. If you look up those fields in the terminal FLDS<GO> you will see they are marked as reference data, that means they are not continually updated. They are refreshed each time you query them. They come from the NBBO quote at the time you query them.


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Yes definitely, the biggest challenge of using direct exchange feeds is the cost of maintenance. Here are a few issues to consider in your position: Cost of maintenance. This includes the time it takes to write a feed handler and keep it up-to-date against the exchange's feed API; the cost of colocation, and (often) higher licensing costs of receiving the ...



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