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I was wondering the same thing too.
But then I found out that each exchange calculates its own index. Hence
the S&P500 is known as SPX at the CBOE, and INX at the NYSE. The DOW 30
is DJX at the CBOE and I think INDU at NYSE.
So depending on which exchange you get your feed from, the symbols and
the numbers will differ. Also, the symbols will differ slightly
depending on which vendor you use eg SP8U from BMI and SPU8 from
PCQUOTE.
>
> I wrote:
> > This has always confused me. Why does SPY on my BMI feed show a
> > closing price on 8/24 of 1088.13 -- exactly identical to the SPX
> > closing price?
>
> Thanks to some pointers from Jay Mackro and Ira <ist@xxxxxx>, I think
> I've figured this out.
>
> Ira said the SPY I was seeing was identical to SPX, but broadcast
> from NY instead of Chicago. (Why? I have no idea. Nor do I know
> why these supposedly-identical indices sometimes differ by a few
> ticks.) Apparently the symbol SXY is a similar clone of OEX.
>
> Following a suggestion from Jay, I dug around in my symbol universe a
> bit, and discovered *three* SPY symbols:
>
> * The SPY *index* from CME. This is the same-as-SPX index
> that I had in my portfolio.
>
> * A SPY stock (Serenpet Inc) traded on the TSE.
>
> * A SPY *stock* on AMEX -- "Standard & Poor'S Dep Receipts".
> Bingo!
>
> I've deleted my previous SPY symbol and replaced it with the SPDR.
> For some reason I haven't started receiving any data on it yet, but
> presumably I will eventually.
>
> Gary
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