Hi: I was able to find on Yahoo the daily open, high, low, close prices for SAIFX (ClearBridge Large Cap Value Fund Class I) for 1/2/1980 - 12/31/1987
https://finance.yahoo.com/quote/SAIFX/history?period1=315705600&period2=567993600&interval=1d&filter...
You have to option to download into a spreadsheet. I would do that, and get the average of the open and close amounts by day for each year. (All the days open, average, and all the days close, average) Then apply that to the units before 1988. Based on what you have stated so far, you don't know how many shares were issued either when you received the initial amount of shares, or the # of shares re-invested each year. Perhaps using a little math, and the dividend rate, you might be able to back into units invested each year (or an approximation). I'm not a mathematician, but there might be a formula that might work.
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