I don't understand the following charts, and wondered if someone could explain to me why they seem inconsistent with one another.
Context: While doing research recently into a mutual fund SGENX, Google Finance produced the following performance chart:
Which shows it beating the S&P 500 Index. Later on I did another comparison with the Vanguard ETF VOO and got this chart:
This confused me because the VOO should mirror the S&P 500 index. Which I verified by comparing it directly to the index:
As a final check I compared them (along with another Vanguard "Extend Market" ETF) on eTrade and got this combined chart:
Which seems to show that VOO outperformed SGENX (however it also looks like VOO outperformed the S&P Index slightly — which also seems a little odd).
What am I missing here?