AlmightyBender
Executive Member
Most are, but momentum investing is not the worst option out there.
I think most investors and fund managers will use past performance as one of the most important criteria in deciding whether to buy a share or not.
That would be why quants analyst and equity analysts use research databases.
If they didn't I'd have been unemployed.
If they do that then they should be unemployed depending on what kind of fund they run. Theoretically they should only be using past data and performance to better understand the current position and environment of the investment and then make a decision to invest based on that current position and their assumptions about the short and long term positions of the investment. The past is the past and logically it should not be used when making long term investment decisions. You should only consider what is happening now and in the future. This is fundamental investing.
However for trading (i.e. not investment) then technical analysis does look at past performance and the call to buy or sell does incorporate analysis of the price movement. But again this is not investment but only short term trading and there are huge differences in risk and purpose of the two.