After some poking around, I found how to get the price of the S&P500:
FinancialData["^SPX"]` and `FinancialData["^SPX", "Company"]
However, I am trying to illustrate the calculation of betas, so I need historical prices, but putting past dates (for example FinancialData["^SPX", DateObject[DatePlus[Today, -90]]]) gives Missing[NotAvailable]. My workaround has been to use an index fund instead, but I would strongly prefer doing this the right way. Any ideas about how to get historical data for the S&P500 with FinancialData[ ]?
By the way I did consult these answers, but
WolframAlpha["s&p500 prices from 10/23/2015 to 10/22/2016",{"DateRangeSpecified:Last:FinancialData"}]
does not produce a TimeSeries list. And, yes, I know that if I was connected to Bloomberg, then an interface exists, I am not.
