I'm getting different constituents from various places.
An Excel sheet from the S&P website indicates 498 constituents in the S&P 500: Link to Excel Sheet on the S&P website, look at the "Issues" tab . However, I can't ascertain if this is the complete list or not. And I can't find any page on the S&P website [Link] that simply lists the constituents.
On the Wikipedia page [Link] there are 502 constituents listed.
On the CBOE website [Link] too, there are 502 constituents listed (it says it is updated at the end of every month).
However, the Wikipedia list doesn't match the CBOE list. I was able to confirm that the CBOE list is more current than the Wikipedia list because CBOE lists American Airlines (AAL), and Wikipedia lists Allergan (AGN). Apparently AAL replaced AGN on the list in March, 2015. So, Wikipedia is definitely wrong/outdated.
So, at the moment, my status is that I have a list from the S&P website containing 498, and a list from CBOE containing 502. And I have no way of confirming if either of them is correct.
Do you have any ideas?
Edit: I only want the constituent list. Not seeking any financial data. It's surprising to me that lists available from respectable sites on the Internet don't match.