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Do you know what the website means by "official data"? I could not find an explanation on the website.
The website's “S&P 500” data begins in 1789. However, I checked and the S&P 500 index was created in 1957 and the Dow Jones index was created in 1885. The New York Stock Exchange was established in 1792, so the website must obtain their early data from somewhere else. Thank you!
In the book: The Right Stock at the Right Time Prospering in the Coming Good Years by Larry Williams, are published some statistics from 1871 of the Index: S & P Composite Stock Price Index;
probably at that time this was the reference Index, and only later became the S & P 500.
Also on this page by legendary trader Dan Zanger, there is this chart showing that as early as 1870 there was a Stock Market Index that later became the S & P 500:
before you click on the button: Download data in csv file,
you should click on: semicolon (at the bottom, where it says: Downloaded data separator: comma | semicolon) so you get the file: csv
with the columns already separated: Date, Open, High, etc...;
then, to quickly transform the csv file to Excel file (xls or xlsx), you can use this free service:
"Performance back to 1950 incorporates the performance of predecessor index, the S&P 90"
so before the S&P 500 Index there was the S&P 90 Index (it probably only had 90 Stocks) and before that the Index
will have had a different composition and name.
