I have understood that both display the same valute (S&P 500) but in ^SPX there are more option's data (more expiries).
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3 Answers
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My understanding is that ^GSPC is Yahoo Finance's 'proprietary' ticker for the S&P 500 index. I have no idea why Yahoo Finance chose not to or was forbidden from using the common SPX ticker. It's worth noting that I have had reason to source the free daily, monthly or weekly ^GSPC data from Yahoo Finance a number of times over the years. As far as I can tell, the data is identical to historical SPX data, therefore I'm sure the tickers represent the same index.
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I remember there was no "^SPX" ticker on yahoo finance two three years ago (not very sure). So I guess "^GSPC" and "SPX" are the same, they just add "^SPX" to follow the most popular naming convention but still keep "^GSPC" for historical reason.
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Spx and spy are real tickers you can trade. Gspc is not tradable I hope it helps
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$\begingroup$ @DStanley I don't think that SPX is the name of a tradable ticker - correct me if I'm wrong though. $\endgroup$ Commented Sep 28, 2022 at 16:23
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$\begingroup$ @rubikscube09 You are correct, I was thinking of SPY. $\endgroup$ Commented Sep 28, 2022 at 16:31
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$\begingroup$ SPX is tradable via Index Options, @rubikscube09 $\endgroup$– pyCthonCommented Sep 28, 2022 at 20:32