Hi there,

I'm doing work with a lot of symbols going back a long time, and a problem I keep running into is my algorithm keeps picking up stocks before they are the stocks they are today. For example, it's buying CRM in 2001, but they didn't IPO until 2004. I want to leave the stock in my list because I want it to be in the pool today, however it's making my backtests inaccurate.

How can I deal with this issue?