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The market was moving fast and either your or my data has inaccurate time stamps. If the time stamps are a few seconds off, this can make up for the difference.
Here it is again, i reloaded my data. On the included chart you'll see the 1min candlestick at 16:00 Eastern Time. The middle of this candle is exactly at 1048.25, ie, the settlement price as found on the CME web site. I also checked last month too and my settlement price is correct using the middle of range for the candle at 16:00. For July 30 i have 1098.25 at the middle of the range of the 1 min candle at 16:00.
Again, my chart shows different closes than yours (Tuesday 31, August) for the 1minute candlestick chart. I'd be curious to see other people 1min. chart for Tuesday 31, August. So Fat i think you have a problem on your end.
Agree with the settlement prices. Still I do not know, whether they are based on
- the last calculated price of the day for the S&P 500 index
- or the midpoint of the calculated price for the S&P 500 index for the 30 seconds prior to close
Your data is different from mine. Same applies to July 30, where my close is a few ticks off your close.
So, at least one of our data sources is inaccurate. Need somebody with a different data feed to check. I would not be astonished, if Interactive Brokers is a few seconds late.
You solved this yesterday - end of month settlement is FV of cash. (plus settlement is never the mid of the last min, it's the last 30 sec)
But to deal with the current discussion, iqfeed has the 4pm last trade at 1048.50
Looks like the exchange does not provide for time stamps. So every data feed provider uses his own time stamps. Interactive Brokers possibly gets the data a bit delayed, so what they stamp is the data of the a past which is already a few seconds ago. This applies to their historical data, so no conclusions possible as to real-time data.
What is the difference between three datafeeds and three lawyers?
The datafeeds will give you only three different versions, the lawyers at least four.