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Hi, trackrat495, and welcome to the Fool!

Feeling my oats today.... I think all the previous responses are lacking, so I'm going to weigh in. pauleckler has a reasonable method of estimating your return in the past year--which isn't what you asked for. newcomer99's method assumes that all the money was in the account for the entire 43 months, which you didn't say. And if you call up the fund company, as peppermintpatty suggests, I seriously doubt that they'll give you a return for the exact 43-month period you're interested in.

Finding the internal rate of return of a series of cash flows requires knowing the date and the amount of each cash flow--which you didn't tell us. If the $4300 investment was 43 monthly deposits of $100, then your annual rate of return was about 22%, over the 43 months. I found this using the XIRR function in Excel. (It's an add-in.)

This method takes into account the timing of the deposits. If you're making regular deposits, the most recent year is weighted more heavily than the first one. This makes comparing your multi-year return to the S&P tricky. A reasonable approach is to use pauleckler's method (or XIRR) for each calendar year, separately, and compare those returns to the S&P.

Tracking returns can be fairly complicated. But it is an essential part of Foolishness. Good luck.

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