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Sorry to belabor this, but I've spent a good bit of time trying to figure out how to derive dividend adjusted historical prices from unadjusted closing prices. It seems as though this should be relatively straightforward, so I'm mystified at the moment. Either there's something wrong with my thought process, or Yahoo's adjusted historical closing prices are incorrect.

To illustrate the calculation problem...

Yahoo's unadjusted closing price for 1/2/15 is \$1215.00 [per Randy's SMF function].

As of the 11/22/19 close, Yahoo's adjusted closing price for WFC-PL on 1/2/15 is \$917.32 [as returned by both SMF and GTR1].

1215 - 917.32 = 297.68 [presumably the total of all intervening dividends]

There have been 19 quarterly dividends of \$18.75 each between 1/2/15 and 11/22/19.

19 * 18.75 = 356.25

1215.00 - 356.25 = 858.75

I've been unable to explain the \$58.57 difference between Yahoo's 917.32 and my calculated 858.75. Might it be some sort of inflation adjustment? Any help would be much appreciated.

Tom