Historical Stock Prices???

I was told to calculate the cost basis for a client's portfolio which was positioned at different intervals between 1970 and 2000. First of all, being new to this stuff, what price should I use to calculate the cost basis for a certain stock; the split adjusted price or the regular price? At first I thought the adjusted, but isn't that used for comparison purposes only? Secondly, where can I find prices for purchases in the 70s? Most sites like Yahoo Finance and MarketWatch only go back so far. Thanks so much for the help.

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lol this sucks. This was my first project they had me do at my 2nd PWM internship for AT&T. Let me just tell you figuring out cost basis for AT&T and all the spin offs and spin off of spin offs is just a nightmare. Good luck.

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Yahoo Finance or Google Finance have the option. If you meant as in dl 30 stock comparisons at once, then no. You can get 1 by 1 though.

 

There are plenty of robust sources where you can pull the data from, but they aren't cheap. Bloomberg is what I use, but its far from the only source.

The free ones will be more limited in what they can do (like was said above; one at a time).

 

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